{ "name": "stig_red_hat_enterprise_linux_7", "date": "2017-12-14", "description": "This Security Technical Implementation Guide is published as a tool to improve the security of Department of Defense (DoD) information systems. The requirements are derived from the National Institute of Standards and Technology (NIST) 800-53 and related documents. Comments or proposed revisions to this document should be sent via email to the following address: disa.stig_spt@mail.mil.", "title": "Red Hat Enterprise Linux 7 Security Technical Implementation Guide", "version": "1", "item_syntax": "^\\w-\\d+$", "section_separator": null, "items": [ { "id": "V-71849", "title": "The file permissions, ownership, and group membership of system files and commands must match the vendor values.", "description": "Discretionary access control is weakened if a user or group has access permissions to system files and directories greater than the default.\n\nSatisfies: SRG-OS-000257-GPOS-00098, SRG-OS-000278-GPOS-00108", "severity": "high" }, { "id": "V-71855", "title": "The cryptographic hash of system files and commands must match vendor values.", "description": "Without cryptographic integrity protections, system command and files can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.", "severity": "high" }, { "id": "V-71859", "title": "The operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system via a graphical user logon.", "description": "Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.\n\nSystem use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist.\n\nThe banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:\n\n\"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.\"\n\n\nSatisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007, SRG-OS-000228-GPOS-00088", "severity": "medium" }, { "id": "V-71861", "title": "The operating system must display the approved Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system via a graphical user logon.", "description": "Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.\n\nSystem use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist.\n\nThe banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:\n\n\"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.\"\n\nSatisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007, SRG-OS-000228-GPOS-00088", "severity": "medium" }, { "id": "V-71863", "title": "The operating system must display the Standard Mandatory DoD Notice and Consent Banner before granting local or remote access to the system via a command line user logon.", "description": "Display of a standardized and approved use notification before granting access to the operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.\n\nSystem use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist.\n\nThe banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:\n\n\"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.\"\n\nSatisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007", "severity": "medium" }, { "id": "V-71891", "title": "The operating system must enable a user session lock until that user re-establishes access using established identification and authentication procedures.", "description": "A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.\n\nThe session lock is implemented at the point where session activity can be determined.\n\nRegardless of where the session lock is determined and implemented, once invoked, the session lock must remain in place until the user reauthenticates. No other activity aside from reauthentication must unlock the system.\n\nSatisfies: SRG-OS-000028-GPOS-00009, SRG-OS-000030-GPOS-00011", "severity": "medium" }, { "id": "V-71893", "title": "The operating system must initiate a screensaver after a 15-minute period of inactivity for graphical user interfaces.", "description": "A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.", "severity": "medium" }, { "id": "V-71897", "title": "The operating system must have the screen package installed.", "description": "A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe screen package allows for a session lock to be implemented and configured.", "severity": "medium" }, { "id": "V-71899", "title": "The operating system must initiate a session lock for the screensaver after a period of inactivity for graphical user interfaces.", "description": "A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.", "severity": "medium" }, { "id": "V-71901", "title": "The operating system must initiate a session lock for graphical user interfaces when the screensaver is activated.", "description": "A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.", "severity": "medium" }, { "id": "V-71903", "title": "When passwords are changed or new passwords are established, the new password must contain at least one upper-case character.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71905", "title": "When passwords are changed or new passwords are established, the new password must contain at least one lower-case character.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71907", "title": "When passwords are changed or new passwords are assigned, the new password must contain at least one numeric character.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71909", "title": "When passwords are changed or new passwords are assigned, the new password must contain at least one special character.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71911", "title": "When passwords are changed a minimum of eight of the total number of characters must be changed.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71913", "title": "When passwords are changed a minimum of four character classes must be changed.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71915", "title": "When passwords are changed the number of repeating consecutive characters must not be more than three characters.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71917", "title": "When passwords are changed the number of repeating characters of the same character class must not be more than four characters.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks.\n\nPassword complexity is one factor of several that determines how long it takes to crack a password. The more complex the password, the greater the number of possible combinations that need to be tested before the password is compromised.", "severity": "medium" }, { "id": "V-71919", "title": "The PAM system service must be configured to store only encrypted representations of passwords.", "description": "Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.", "severity": "medium" }, { "id": "V-71921", "title": "The shadow file must be configured to store only encrypted representations of passwords.", "description": "Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.", "severity": "medium" }, { "id": "V-71923", "title": "User and group account administration utilities must be configured to store only encrypted representations of passwords.", "description": "Passwords need to be protected at all times, and encryption is the standard method for protecting passwords. If passwords are not encrypted, they can be plainly read (i.e., clear text) and easily compromised. Passwords encrypted with a weak algorithm are no more protected than if they are kept in plain text.", "severity": "medium" }, { "id": "V-71925", "title": "Passwords for new users must be restricted to a 24 hours/1 day minimum lifetime.", "description": "Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.", "severity": "medium" }, { "id": "V-71927", "title": "Passwords must be restricted to a 24 hours/1 day minimum lifetime.", "description": "Enforcing a minimum password lifetime helps to prevent repeated password changes to defeat the password reuse or history enforcement requirement. If users are allowed to immediately and continually change their password, the password could be repeatedly changed in a short period of time to defeat the organization's policy regarding password reuse.", "severity": "medium" }, { "id": "V-71929", "title": "Passwords for new users must be restricted to a 60-day maximum lifetime.", "description": "Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.", "severity": "medium" }, { "id": "V-71931", "title": "Existing passwords must be restricted to a 60-day maximum lifetime.", "description": "Any password, no matter how complex, can eventually be cracked. Therefore, passwords need to be changed periodically. If the operating system does not limit the lifetime of passwords and force users to change their passwords, there is the risk that the operating system passwords could be compromised.", "severity": "medium" }, { "id": "V-71933", "title": "Passwords must be prohibited from reuse for a minimum of five generations.", "description": "Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. If the information system or application allows the user to consecutively reuse their password when that password has exceeded its defined lifetime, the end result is a password that is not changed per policy requirements.", "severity": "medium" }, { "id": "V-71935", "title": "Passwords must be a minimum of 15 characters in length.", "description": "The shorter the password, the lower the number of possible combinations that need to be tested before the password is compromised.\n\nPassword complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. Password length is one factor of several that helps to determine strength and how long it takes to crack a password. Use of more characters in a password helps to exponentially increase the time and/or resources required to compromise the password.", "severity": "medium" }, { "id": "V-71937", "title": "The system must not have accounts configured with blank or null passwords.", "description": "If an account has an empty password, anyone could log on and run commands with the privileges of that account. Accounts with empty passwords should never be used in operational environments.", "severity": "high" }, { "id": "V-71939", "title": "The SSH daemon must not allow authentication using an empty password.", "description": "Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.", "severity": "high" }, { "id": "V-71941", "title": "The operating system must disable account identifiers (individuals, groups, roles, and devices) if the password expires.", "description": "Inactive identifiers pose a risk to systems and applications because attackers may exploit an inactive identifier and potentially obtain undetected access to the system. Owners of inactive accounts will not notice if unauthorized access to their user account has been obtained.\n\nOperating systems need to track periods of inactivity and disable application identifiers after zero days of inactivity.", "severity": "medium" }, { "id": "V-71943", "title": "Accounts subject to three unsuccessful logon attempts within 15 minutes must be locked for the maximum configurable period.", "description": "By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.\n\nSatisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005", "severity": "medium" }, { "id": "V-71945", "title": "If three unsuccessful root logon attempts within 15 minutes occur the associated account must be locked.", "description": "By limiting the number of failed logon attempts, the risk of unauthorized system access via user password guessing, otherwise known as brute-forcing, is reduced. Limits are imposed by locking the account.\n\nSatisfies: SRG-OS-000329-GPOS-00128, SRG-OS-000021-GPOS-00005", "severity": "medium" }, { "id": "V-71947", "title": "Users must provide a password for privilege escalation.", "description": "Without re-authentication, users may access resources or perform tasks for which they do not have authorization. \n\nWhen operating systems provide the capability to escalate a functional capability, it is critical the user re-authenticate.\n\nSatisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158", "severity": "medium" }, { "id": "V-71949", "title": "Users must re-authenticate for privilege escalation.", "description": "Without re-authentication, users may access resources or perform tasks for which they do not have authorization. \n\nWhen operating systems provide the capability to escalate a functional capability, it is critical the user reauthenticate.\n\nSatisfies: SRG-OS-000373-GPOS-00156, SRG-OS-000373-GPOS-00157, SRG-OS-000373-GPOS-00158", "severity": "medium" }, { "id": "V-71951", "title": "The delay between logon prompts following a failed console logon attempt must be at least four seconds.", "description": "Configuring the operating system to implement organization-wide security implementation guides and security checklists verifies compliance with federal standards and establishes a common security baseline across DoD that reflects the most restrictive security posture consistent with operational requirements.\n\nConfiguration settings are the set of parameters that can be changed in hardware, software, or firmware components of the system that affect the security posture and/or functionality of the system. Security-related parameters are those parameters impacting the security state of the system, including the parameters required to satisfy other security control requirements. Security-related parameters include, for example, registry settings; account, file, and directory permission settings; and settings for functions, ports, protocols, services, and remote connections.", "severity": "medium" }, { "id": "V-71953", "title": "The operating system must not allow an unattended or automatic logon to the system via a graphical user interface.", "description": "Failure to restrict system access to authenticated users negatively impacts operating system security.", "severity": "high" }, { "id": "V-71955", "title": "The operating system must not allow an unrestricted logon to the system.", "description": "Failure to restrict system access to authenticated users negatively impacts operating system security.", "severity": "high" }, { "id": "V-71957", "title": "The operating system must not allow users to override SSH environment variables.", "description": "Failure to restrict system access to authenticated users negatively impacts operating system security.", "severity": "medium" }, { "id": "V-71959", "title": "The operating system must not allow a non-certificate trusted host SSH logon to the system.", "description": "Failure to restrict system access to authenticated users negatively impacts operating system security.", "severity": "medium" }, { "id": "V-71961", "title": "Systems with a Basic Input/Output System (BIOS) must require authentication upon booting into single-user and maintenance modes.", "description": "If the system does not require valid root authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu.", "severity": "high" }, { "id": "V-71963", "title": "Systems using Unified Extensible Firmware Interface (UEFI) must require authentication upon booting into single-user and maintenance modes.", "description": "If the system does not require valid root authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system. GRUB 2 is the default boot loader for RHEL 7 and is designed to require a password to boot into single-user mode or make modifications to the boot menu.", "severity": "high" }, { "id": "V-71965", "title": "The operating system must uniquely identify and must authenticate organizational users (or processes acting on behalf of organizational users) using multifactor authentication.", "description": "To assure accountability and prevent unauthenticated access, organizational users must be identified and authenticated to prevent potential misuse and compromise of the system.\n\nOrganizational users include organizational employees or individuals the organization deems to have equivalent status of employees (e.g., contractors). Organizational users (and processes acting on behalf of users) must be uniquely identified and authenticated to all accesses, except for the following:\n\n1) Accesses explicitly identified and documented by the organization. Organizations document specific user actions that can be performed on the information system without identification or authentication; \n\nand\n\n2) Accesses that occur through authorized use of group authenticators without individual authentication. Organizations may require unique identification of individuals in group accounts (e.g., shared privilege accounts) or for detailed accountability of individual activity.\n\nSatisfies: SRG-OS-000104-GPOS-00051, SRG-OS-000106-GPOS-00053, SRG-OS-000107-GPOS-00054, SRG-OS-000109-GPOS-00056, SRG-OS-000108-GPOS-00055, SRG-OS-000108-GPOS-00057, SRG-OS-000108-GPOS-00058", "severity": "medium" }, { "id": "V-71967", "title": "The rsh-server package must not be installed.", "description": "It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors.\n\nOperating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions).\n\nThe rsh-server service provides an unencrypted remote access service that does not provide for the confidentiality and integrity of user passwords or the remote session and has very weak authentication.\n\nIf a privileged user were to log on using this service, the privileged user password could be compromised.", "severity": "high" }, { "id": "V-71969", "title": "The ypserv package must not be installed.", "description": "Removing the \"ypserv\" package decreases the risk of the accidental (or intentional) activation of NIS or NIS+ services.", "severity": "high" }, { "id": "V-71971", "title": "The operating system must prevent non-privileged users from executing privileged functions to include disabling, circumventing, or altering implemented security safeguards/countermeasures.", "description": "Preventing non-privileged users from executing privileged functions mitigates the risk that unauthorized individuals or processes may gain unnecessary access to information or privileges.\n\nPrivileged functions include, for example, establishing accounts, performing system integrity checks, or administering cryptographic key management activities. Non-privileged users are individuals who do not possess appropriate authorizations. Circumventing intrusion detection and prevention mechanisms or malicious code protection mechanisms are examples of privileged functions that require protection from non-privileged users.", "severity": "medium" }, { "id": "V-71973", "title": "A file integrity tool must verify the baseline operating system configuration at least weekly.", "description": "Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security.\n\nDetecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's Information Management Officer (IMO)/Information System Security Officer (ISSO) and System Administrators (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.", "severity": "medium" }, { "id": "V-71975", "title": "Designated personnel must be notified if baseline configurations are changed in an unauthorized manner.", "description": "Unauthorized changes to the baseline configuration could make the system vulnerable to various attacks or allow unauthorized access to the operating system. Changes to operating system configurations can have unintended side effects, some of which may be relevant to security.\n\nDetecting such changes and providing an automated response can help avoid unintended, negative consequences that could ultimately affect the security state of the operating system. The operating system's Information Management Officer (IMO)/Information System Security Officer (ISSO) and System Administrators (SAs) must be notified via email and/or monitoring system trap when there is an unauthorized modification of a configuration item.", "severity": "medium" }, { "id": "V-71977", "title": "The operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components from a repository without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization.", "description": "Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor.\n\nAccordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization.\n\nVerifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.", "severity": "high" }, { "id": "V-71979", "title": "The operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components of local packages without verification they have been digitally signed using a certificate that is issued by a Certificate Authority (CA) that is recognized and approved by the organization.", "description": "Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor.\n\nAccordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization.\n\nVerifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This verifies the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved CA.", "severity": "high" }, { "id": "V-71981", "title": "The operating system must prevent the installation of software, patches, service packs, device drivers, or operating system components of packages without verification of the repository metadata.", "description": "Changes to any software components can have significant effects on the overall security of the operating system. This requirement ensures the software has not been tampered with and that it has been provided by a trusted vendor.\n\nAccordingly, patches, service packs, device drivers, or operating system components must be signed with a certificate recognized and approved by the organization.\n\nVerifying the authenticity of the software prior to installation validates the integrity of the patch or upgrade received from a vendor. This ensures the software has not been tampered with and that it has been provided by a trusted vendor. Self-signed certificates are disallowed by this requirement. The operating system should not have to verify the software again. This requirement does not mandate DoD certificates for this purpose; however, the certificate used to verify the software must be from an approved Certificate Authority.", "severity": "high" }, { "id": "V-71983", "title": "USB mass storage must be disabled.", "description": "USB mass storage permits easy introduction of unknown devices, thereby facilitating malicious activity.\n\nSatisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227", "severity": "medium" }, { "id": "V-71985", "title": "File system automounter must be disabled unless required.", "description": "Automatically mounting file systems permits easy introduction of unknown devices, thereby facilitating malicious activity.\n\nSatisfies: SRG-OS-000114-GPOS-00059, SRG-OS-000378-GPOS-00163, SRG-OS-000480-GPOS-00227", "severity": "medium" }, { "id": "V-71987", "title": "The operating system must remove all software components after updated versions have been installed.", "description": "Previous versions of software components that are not removed from the information system after updates have been installed may be exploited by adversaries. Some information technology products may remove older versions of software automatically from the information system.", "severity": "low" }, { "id": "V-71989", "title": "The operating system must enable SELinux.", "description": "Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.\n\nThis requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.", "severity": "high" }, { "id": "V-71991", "title": "The operating system must enable the SELinux targeted policy.", "description": "Without verification of the security functions, security functions may not operate correctly and the failure may go unnoticed. Security function is defined as the hardware, software, and/or firmware of the information system responsible for enforcing the system security policy and supporting the isolation of code and data on which the protection is based. Security functionality includes, but is not limited to, establishing system accounts, configuring access authorizations (i.e., permissions, privileges), setting events to be audited, and setting intrusion detection parameters.\n\nThis requirement applies to operating systems performing security function verification/testing and/or systems and environments that require this functionality.", "severity": "high" }, { "id": "V-71993", "title": "The x86 Ctrl-Alt-Delete key sequence must be disabled.", "description": "A locally logged-on user who presses Ctrl-Alt-Delete, when at the console, can reboot the system. If accidentally pressed, as could happen in the case of a mixed OS environment, this can create the risk of short-term loss of availability of systems due to unintentional reboot. In the GNOME graphical environment, risk of unintentional reboot from the Ctrl-Alt-Delete sequence is reduced because the user will be prompted before any action is taken.", "severity": "high" }, { "id": "V-71995", "title": "The operating system must define default permissions for all authenticated users in such a way that the user can only read and modify their own files.", "description": "Setting the most restrictive default permissions ensures that when new accounts are created, they do not have unnecessary access.", "severity": "medium" }, { "id": "V-71997", "title": "The operating system must be a vendor supported release.", "description": "An operating system release is considered \"supported\" if the vendor continues to provide security patches for the product. With an unsupported release, it will not be possible to resolve security issues discovered in the system software.", "severity": "high" }, { "id": "V-71999", "title": "Vendor packaged system security patches and updates must be installed and up to date.", "description": "Timely patching is critical for maintaining the operational availability, confidentiality, and integrity of information technology (IT) systems. However, failure to keep operating system and application software patched is a common mistake made by IT professionals. New patches are released daily, and it is often difficult for even experienced System Administrators to keep abreast of all the new patches. When new weaknesses in an operating system exist, patches are usually made available by the vendor to resolve the problems. If the most recent security patches and updates are not installed, unauthorized users may take advantage of weaknesses in the unpatched software. The lack of prompt attention to patching could result in a system compromise.", "severity": "medium" }, { "id": "V-72001", "title": "The system must not have unnecessary accounts.", "description": "Accounts providing no operational purpose provide additional opportunities for system compromise. Unnecessary accounts include user accounts for individuals not requiring access to the system and application accounts for applications not installed on the system.", "severity": "medium" }, { "id": "V-72003", "title": "All Group Identifiers (GIDs) referenced in the /etc/passwd file must be defined in the /etc/group file.", "description": "If a user is assigned the GID of a group not existing on the system, and a group with the GID is subsequently created, the user may have unintended rights to any files associated with the group.", "severity": "low" }, { "id": "V-72005", "title": "The root account must be the only account having unrestricted access to the system.", "description": "If an account other than root also has a User Identifier (UID) of \"0\", it has root authority, giving that account unrestricted access to the entire operating system. Multiple accounts with a UID of \"0\" afford an opportunity for potential intruders to guess a password for a privileged account.", "severity": "high" }, { "id": "V-72007", "title": "All files and directories must have a valid owner.", "description": "Unowned files and directories may be unintentionally inherited if a user is assigned the same User Identifier \"UID\" as the UID of the un-owned files.", "severity": "medium" }, { "id": "V-72009", "title": "All files and directories must have a valid group owner.", "description": "Files without a valid group owner may be unintentionally inherited if a group is assigned the same Group Identifier (GID) as the GID of the files without a valid group owner.", "severity": "medium" }, { "id": "V-72011", "title": "All local interactive users must have a home directory assigned in the /etc/passwd file.", "description": "If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own.", "severity": "medium" }, { "id": "V-72013", "title": "All local interactive user accounts, upon creation, must be assigned a home directory.", "description": "If local interactive users are not assigned a valid home directory, there is no place for the storage and control of files they should own.", "severity": "medium" }, { "id": "V-72015", "title": "All local interactive user home directories defined in the /etc/passwd file must exist.", "description": "If a local interactive user has a home directory defined that does not exist, the user may be given access to the / directory as the current working directory upon logon. This could create a Denial of Service because the user would not be able to access their logon configuration files, and it may give them visibility to system files they normally would not be able to access.", "severity": "medium" }, { "id": "V-72017", "title": "All local interactive user home directories must have mode 0750 or less permissive.", "description": "Excessive permissions on local interactive user home directories may allow unauthorized access to user files by other users.", "severity": "medium" }, { "id": "V-72019", "title": "All local interactive user home directories must be owned by their respective users.", "description": "If a local interactive user does not own their home directory, unauthorized users could access or modify the user's files, and the users may not be able to access their own files.", "severity": "medium" }, { "id": "V-72021", "title": "All local interactive user home directories must be group-owned by the home directory owners primary group.", "description": "If the Group Identifier (GID) of a local interactive user’s home directory is not the same as the primary GID of the user, this would allow unauthorized access to the user’s files, and users that share the same group may not be able to access files that they legitimately should.", "severity": "medium" }, { "id": "V-72023", "title": "All files and directories contained in local interactive user home directories must be owned by the owner of the home directory.", "description": "If local interactive users do not own the files in their directories, unauthorized users may be able to access them. Additionally, if files are not owned by the user, this could be an indication of system compromise.", "severity": "medium" }, { "id": "V-72025", "title": "All files and directories contained in local interactive user home directories must be group-owned by a group of which the home directory owner is a member.", "description": "If a local interactive user’s files are group-owned by a group of which the user is not a member, unintended users may be able to access them.", "severity": "medium" }, { "id": "V-72027", "title": "All files and directories contained in local interactive user home directories must have mode 0750 or less permissive.", "description": "If a local interactive user files have excessive permissions, unintended users may be able to access or modify them.", "severity": "medium" }, { "id": "V-72029", "title": "All local initialization files for interactive users must be owned by the home directory user or root.", "description": "Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.", "severity": "medium" }, { "id": "V-72031", "title": "Local initialization files for local interactive users must be group-owned by the users primary group or root.", "description": "Local initialization files for interactive users are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.", "severity": "medium" }, { "id": "V-72033", "title": "All local initialization files must have mode 0740 or less permissive.", "description": "Local initialization files are used to configure the user's shell environment upon logon. Malicious modification of these files could compromise accounts upon logon.", "severity": "medium" }, { "id": "V-72035", "title": "All local interactive user initialization files executable search paths must contain only paths that resolve to the users home directory.", "description": "The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory (other than the user’s home directory), executables in these directories may be executed instead of system commands. This variable is formatted as a colon-separated list of directories. If there is an empty entry, such as a leading or trailing colon or two consecutive colons, this is interpreted as the current working directory. If deviations from the default system search path for the local interactive user are required, they must be documented with the Information System Security Officer (ISSO).", "severity": "medium" }, { "id": "V-72037", "title": "Local initialization files must not execute world-writable programs.", "description": "If user start-up files execute world-writable programs, especially in unprotected directories, they could be maliciously modified to destroy user files or otherwise compromise the system at the user level. If the system is compromised at the user level, it is easier to elevate privileges to eventually compromise the system at the root and network level.", "severity": "medium" }, { "id": "V-72039", "title": "All system device files must be correctly labeled to prevent unauthorized modification.", "description": "If an unauthorized or modified device is allowed to exist on the system, there is the possibility the system may perform unintended or unauthorized operations.", "severity": "medium" }, { "id": "V-72041", "title": "File systems that contain user home directories must be mounted to prevent files with the setuid and setgid bit set from being executed.", "description": "The \"nosuid\" mount option causes the system to not execute setuid and setgid files with owner privileges. This option must be used for mounting any file system not containing approved setuid and setguid files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.", "severity": "medium" }, { "id": "V-72043", "title": "File systems that are used with removable media must be mounted to prevent files with the setuid and setgid bit set from being executed.", "description": "The \"nosuid\" mount option causes the system to not execute \"setuid\" and \"setgid\" files with owner privileges. This option must be used for mounting any file system not containing approved \"setuid\" and \"setguid\" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.", "severity": "medium" }, { "id": "V-72045", "title": "File systems that are being imported via Network File System (NFS) must be mounted to prevent files with the setuid and setgid bit set from being executed.", "description": "The \"nosuid\" mount option causes the system to not execute \"setuid\" and \"setgid\" files with owner privileges. This option must be used for mounting any file system not containing approved \"setuid\" and \"setguid\" files. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.", "severity": "medium" }, { "id": "V-72047", "title": "All world-writable directories must be group-owned by root, sys, bin, or an application group.", "description": "If a world-writable directory has the sticky bit set and is not group-owned by a privileged Group Identifier (GID), unauthorized users may be able to modify files created by others.\n\nThe only authorized public directories are those temporary directories supplied with the system or those designed to be temporary file repositories. The setting is normally reserved for directories used by the system and by users for temporary file storage, (e.g., /tmp), and for directories requiring global read/write access.", "severity": "medium" }, { "id": "V-72049", "title": "The umask must be set to 077 for all local interactive user accounts.", "description": "The umask controls the default access mode assigned to newly created files. A umask of 077 limits new files to mode 700 or less permissive. Although umask can be represented as a four-digit number, the first digit representing special access modes is typically ignored or required to be \"0\". This requirement applies to the globally configured system defaults and the local interactive user defaults for each account on the system.", "severity": "medium" }, { "id": "V-72051", "title": "Cron logging must be implemented.", "description": "Cron logging can be used to trace the successful or unsuccessful execution of cron jobs. It can also be used to spot intrusions into the use of the cron facility by unauthorized and malicious users.", "severity": "medium" }, { "id": "V-72053", "title": "If the cron.allow file exists it must be owned by root.", "description": "If the owner of the \"cron.allow\" file is not set to root, the possibility exists for an unauthorized user to view or to edit sensitive information.", "severity": "medium" }, { "id": "V-72055", "title": "If the cron.allow file exists it must be group-owned by root.", "description": "If the group owner of the \"cron.allow\" file is not set to root, sensitive information could be viewed or edited by unauthorized users.", "severity": "medium" }, { "id": "V-72057", "title": "Kernel core dumps must be disabled unless needed.", "description": "Kernel core dumps may contain the full contents of system memory at the time of the crash. Kernel core dumps may consume a considerable amount of disk space and may result in denial of service by exhausting the available space on the target file system partition.", "severity": "medium" }, { "id": "V-72059", "title": "A separate file system must be used for user home directories (such as /home or an equivalent).", "description": "The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.", "severity": "low" }, { "id": "V-72061", "title": "The system must use a separate file system for /var.", "description": "The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.", "severity": "low" }, { "id": "V-72063", "title": "The system must use a separate file system for the system audit data path.", "description": "The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.", "severity": "low" }, { "id": "V-72065", "title": "The system must use a separate file system for /tmp (or equivalent).", "description": "The use of separate file systems for different paths can protect the system from failures resulting from a file system becoming full or failing.", "severity": "low" }, { "id": "V-72067", "title": "The operating system must implement NIST FIPS-validated cryptography for the following: to provision digital signatures, to generate cryptographic hashes, and to protect data requiring data-at-rest protections in accordance with applicable federal laws, Executive Orders, directives, policies, regulations, and standards.", "description": "Use of weak or untested encryption algorithms undermines the purposes of using encryption to protect data. The operating system must implement cryptographic modules adhering to the higher standards approved by the federal government since this provides assurance they have been tested and validated.\n\nSatisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000185-GPOS-00079, SRG-OS-000396-GPOS-00176, SRG-OS-000405-GPOS-00184, SRG-OS-000478-GPOS-00223", "severity": "high" }, { "id": "V-72069", "title": "The file integrity tool must be configured to verify Access Control Lists (ACLs).", "description": "ACLs can provide permissions beyond those permitted through the file mode and must be verified by file integrity tools.", "severity": "low" }, { "id": "V-72071", "title": "The file integrity tool must be configured to verify extended attributes.", "description": "Extended attributes in file systems are used to contain arbitrary data and file metadata with security implications.", "severity": "low" }, { "id": "V-72073", "title": "The file integrity tool must use FIPS 140-2 approved cryptographic hashes for validating file contents and directories.", "description": "File integrity tools use cryptographic hashes for verifying file contents and directories have not been altered. These hashes must be FIPS 140-2 approved cryptographic hashes.", "severity": "medium" }, { "id": "V-72075", "title": "The system must not allow removable media to be used as the boot loader unless approved.", "description": "Malicious users with removable boot media can gain access to a system configured to use removable media as the boot loader. If removable media is designed to be used as the boot loader, the requirement must be documented with the Information System Security Officer (ISSO).", "severity": "medium" }, { "id": "V-72077", "title": "The telnet-server package must not be installed.", "description": "It is detrimental for operating systems to provide, or install by default, functionality exceeding requirements or mission objectives. These unnecessary capabilities or services are often overlooked and therefore may remain unsecured. They increase the risk to the platform by providing additional attack vectors.\n\nOperating systems are capable of providing a wide variety of functions and services. Some of the functions and services, provided by default, may not be necessary to support essential organizational operations (e.g., key missions, functions).\n\nExamples of non-essential capabilities include, but are not limited to, games, software packages, tools, and demonstration software not related to requirements or providing a wide array of functionality not required for every mission, but which cannot be disabled.", "severity": "high" }, { "id": "V-72079", "title": "Auditing must be configured to produce records containing information to establish what type of events occurred, where the events occurred, the source of the events, and the outcome of the events.\n\nThese audit records must also identify individual identities of group account users.", "description": "Without establishing what type of events occurred, it would be difficult to establish, correlate, and investigate the events leading up to an outage or attack.\n\nAudit record content that may be necessary to satisfy this requirement includes, for example, time stamps, source and destination addresses, user/process identifiers, event descriptions, success/fail indications, filenames involved, and access control or flow control rules invoked.\n\nAssociating event types with detected events in the operating system audit logs provides a means of investigating an attack; recognizing resource utilization or capacity thresholds; or identifying an improperly configured operating system.\n\nSatisfies: SRG-OS-000038-GPOS-00016, SRG-OS-000039-GPOS-00017, SRG-OS-000042-GPOS-00021, SRG-OS-000254-GPOS-00095, SRG-OS-000255-GPOS-00096", "severity": "high" }, { "id": "V-72081", "title": "The operating system must shut down upon audit processing failure, unless availability is an overriding concern. If availability is a concern, the system must alert the designated staff (System Administrator [SA] and Information System Security Officer [ISSO] at a minimum) in the event of an audit processing failure.", "description": "It is critical for the appropriate personnel to be aware if a system is at risk of failing to process audit logs as required. Without this notification, the security personnel may be unaware of an impending failure of the audit capability, and system operation may be adversely affected.\n\nAudit processing failures include software/hardware errors, failures in the audit capturing mechanisms, and audit storage capacity being reached or exceeded.\n\nThis requirement applies to each audit data storage repository (i.e., distinct information system component where audit records are stored), the centralized audit storage capacity of organizations (i.e., all audit data storage repositories combined), or both.\n\nSatisfies: SRG-OS-000046-GPOS-00022, SRG-OS-000047-GPOS-00023", "severity": "medium" }, { "id": "V-72083", "title": "The operating system must off-load audit records onto a different system or media from the system being audited.", "description": "Information stored in one location is vulnerable to accidental or incidental deletion or alteration.\n\nOff-loading is a common process in information systems with limited audit storage capacity.\n\nSatisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224", "severity": "medium" }, { "id": "V-72085", "title": "The operating system must encrypt the transfer of audit records off-loaded onto a different system or media from the system being audited.", "description": "Information stored in one location is vulnerable to accidental or incidental deletion or alteration.\n\nOff-loading is a common process in information systems with limited audit storage capacity.\n\nSatisfies: SRG-OS-000342-GPOS-00133, SRG-OS-000479-GPOS-00224", "severity": "medium" }, { "id": "V-72087", "title": "The audit system must take appropriate action when the audit storage volume is full.", "description": "Taking appropriate action in case of a filled audit storage volume will minimize the possibility of losing audit records.", "severity": "medium" }, { "id": "V-72089", "title": "The operating system must immediately notify the System Administrator (SA) and Information System Security Officer ISSO (at a minimum) when allocated audit record storage volume reaches 75% of the repository maximum audit record storage capacity.", "description": "If security personnel are not notified immediately when storage volume reaches 75 percent utilization, they are unable to plan for audit record storage capacity expansion.", "severity": "medium" }, { "id": "V-72091", "title": "The operating system must immediately notify the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) via email when the threshold for the repository maximum audit record storage capacity is reached.", "description": "If security personnel are not notified immediately when the threshold for the repository maximum audit record storage capacity is reached, they are unable to expand the audit record storage capacity before records are lost.", "severity": "medium" }, { "id": "V-72093", "title": "The operating system must immediately notify the System Administrator (SA) and Information System Security Officer (ISSO) (at a minimum) when the threshold for the repository maximum audit record storage capacity is reached.", "description": "If security personnel are not notified immediately when the threshold for the repository maximum audit record storage capacity is reached, they are unable to expand the audit record storage capacity before records are lost.", "severity": "medium" }, { "id": "V-72095", "title": "All privileged function executions must be audited.", "description": "Misuse of privileged functions, either intentionally or unintentionally by authorized users, or by unauthorized external entities that have compromised information system accounts, is a serious and ongoing concern and can have significant adverse impacts on organizations. Auditing the use of privileged functions is one way to detect such misuse and identify the risk from insider threats and the advanced persistent threat.", "severity": "medium" }, { "id": "V-72097", "title": "All uses of the chown command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219", "severity": "medium" }, { "id": "V-72099", "title": "All uses of the fchown command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219", "severity": "medium" }, { "id": "V-72101", "title": "All uses of the lchown command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219", "severity": "medium" }, { "id": "V-72103", "title": "All uses of the fchownat command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000392-GPOS-00172, SRG-OS-000458-GPOS-00203, SRG-OS-000474-GPOS-00219", "severity": "medium" }, { "id": "V-72105", "title": "All uses of the chmod command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72107", "title": "All uses of the fchmod command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72109", "title": "All uses of the fchmodat command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72111", "title": "All uses of the setxattr command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72113", "title": "All uses of the fsetxattr command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72115", "title": "All uses of the lsetxattr command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72117", "title": "All uses of the removexattr command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72119", "title": "All uses of the fremovexattr command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72121", "title": "All uses of the lremovexattr command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000458-GPOS-00203, SRG-OS-000392-GPOS-00172, SRG-OS-000064-GPOS-00033", "severity": "medium" }, { "id": "V-72123", "title": "All uses of the creat command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72125", "title": "All uses of the open command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72127", "title": "All uses of the openat command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72129", "title": "All uses of the open_by_handle_at command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72131", "title": "All uses of the truncate command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72133", "title": "All uses of the ftruncate command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000064-GPOS-00033, SRG-OS-000458-GPOS-00203, SRG-OS-000461-GPOS-00205, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72135", "title": "All uses of the semanage command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209", "severity": "medium" }, { "id": "V-72137", "title": "All uses of the setsebool command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209", "severity": "medium" }, { "id": "V-72139", "title": "All uses of the chcon command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209", "severity": "medium" }, { "id": "V-72141", "title": "All uses of the setfiles command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000463-GPOS-00207, SRG-OS-000465-GPOS-00209", "severity": "medium" }, { "id": "V-72143", "title": "The operating system must generate audit records for all successful/unsuccessful account access count events.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000470-GPOS-00214, SRG-OS-000473-GPOS-00218", "severity": "medium" }, { "id": "V-72145", "title": "The operating system must generate audit records for all unsuccessful account access events.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000470-GPOS-00214, SRG-OS-000473-GPOS-00218", "severity": "medium" }, { "id": "V-72147", "title": "The operating system must generate audit records for all successful account access events.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000392-GPOS-00172, SRG-OS-000470-GPOS-00214, SRG-OS-000473-GPOS-00218", "severity": "medium" }, { "id": "V-72149", "title": "All uses of the passwd command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72151", "title": "All uses of the unix_chkpwd command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72153", "title": "All uses of the gpasswd command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72155", "title": "All uses of the chage command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72157", "title": "All uses of the userhelper command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged password commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72159", "title": "All uses of the su command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72161", "title": "All uses of the sudo command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72163", "title": "All uses of the sudoers command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72165", "title": "All uses of the newgrp command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72167", "title": "All uses of the chsh command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72169", "title": "All uses of the sudoedit command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged access commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000037-GPOS-00015, SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000462-GPOS-00206, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72171", "title": "All uses of the mount command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72173", "title": "All uses of the umount command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged mount commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72175", "title": "All uses of the postdrop command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged postfix commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72177", "title": "All uses of the postqueue command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged postfix commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72179", "title": "All uses of the ssh-keysign command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged ssh commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72183", "title": "All uses of the crontab command must be audited.", "description": "Reconstruction of harmful events or forensic analysis is not possible if audit records do not contain enough information.\n\nAt a minimum, the organization must audit the full-text recording of privileged commands. The organization must maintain audit trails in sufficient detail to reconstruct events to determine the cause and impact of compromise.\n\nSatisfies: SRG-OS-000042-GPOS-00020, SRG-OS-000392-GPOS-00172, SRG-OS-000471-GPOS-00215", "severity": "medium" }, { "id": "V-72185", "title": "All uses of the pam_timestamp_check command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.", "severity": "medium" }, { "id": "V-72187", "title": "All uses of the init_module command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" }, { "id": "V-72189", "title": "All uses of the delete_module command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" }, { "id": "V-72191", "title": "All uses of the insmod command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" }, { "id": "V-72193", "title": "All uses of the rmmod command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" }, { "id": "V-72195", "title": "All uses of the modprobe command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" }, { "id": "V-72197", "title": "The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/passwd.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000004-GPOS-00004, SRG-OS-000239-GPOS-00089, SRG-OS-000240-GPOS-00090, SRG-OS-000241-GPOS-00091, SRG-OS-000303-GPOS-00120, SRG-OS-000476-GPOS-00221", "severity": "medium" }, { "id": "V-72199", "title": "All uses of the rename command must be audited.", "description": "If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\nSatisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00210, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72201", "title": "All uses of the renameat command must be audited.", "description": "If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\nSatisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00210, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72203", "title": "All uses of the rmdir command must be audited.", "description": "If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\nSatisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00210, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72205", "title": "All uses of the unlink command must be audited.", "description": "If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\nSatisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00210, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72207", "title": "All uses of the unlinkat command must be audited.", "description": "If the system is not configured to audit certain activities and write them to an audit log, it is more difficult to detect and track system compromises and damages incurred during a system compromise.\n\nSatisfies: SRG-OS-000466-GPOS-00210, SRG-OS-000467-GPOS-00210, SRG-OS-000468-GPOS-00212, SRG-OS-000392-GPOS-00172", "severity": "medium" }, { "id": "V-72209", "title": "The system must send rsyslog output to a log aggregation server.", "description": "Sending rsyslog output to another system ensures that the logs cannot be removed or modified in the event that the system is compromised or has a hardware failure.", "severity": "medium" }, { "id": "V-72211", "title": "The rsyslog daemon must not accept log messages from other servers unless the server is being used for log aggregation.", "description": "Unintentionally running a rsyslog server accepting remote messages puts the system at increased risk. Malicious rsyslog messages sent to the server could exploit vulnerabilities in the server software itself, could introduce misleading information in to the system's logs, or could fill the system's storage leading to a Denial of Service.\nIf the system is intended to be a log aggregation server its use must be documented with the ISSO.", "severity": "medium" }, { "id": "V-72213", "title": "The system must use a virus scan program.", "description": "Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems. \n\nThe virus scanning software should be configured to perform scans dynamically on accessed files. If this capability is not available, the system must be configured to scan, at a minimum, all altered files on the system on a daily basis.\n\nIf the system processes inbound SMTP mail, the virus scanner must be configured to scan all received mail.", "severity": "high" }, { "id": "V-72215", "title": "The system must update the virus scan program every seven days or more frequently.", "description": "Virus scanning software can be used to protect a system from penetration from computer viruses and to limit their spread through intermediate systems. \n\nThe virus scanning software should be configured to check for software and virus definition updates with a frequency no longer than seven days. If a manual process is required to update the virus scan software or definitions, it must be documented with the Information System Security Officer (ISSO).", "severity": "medium" }, { "id": "V-72217", "title": "The operating system must limit the number of concurrent sessions to 10 for all accounts and/or account types.", "description": "Operating system management includes the ability to control the number of users and user sessions that utilize an operating system. Limiting the number of allowed users and sessions per user is helpful in reducing the risks related to DoS attacks.\n\nThis requirement addresses concurrent sessions for information system accounts and does not address concurrent sessions by single users via multiple system accounts. The maximum number of concurrent sessions should be defined based on mission needs and the operational environment for each system.", "severity": "low" }, { "id": "V-72219", "title": "The host must be configured to prohibit or restrict the use of functions, ports, protocols, and/or services, as defined in the Ports, Protocols, and Services Management Component Local Service Assessment (PPSM CLSA) and vulnerability assessments.", "description": "In order to prevent unauthorized connection of devices, unauthorized transfer of information, or unauthorized tunneling (i.e., embedding of data types within data types), organizations must disable or restrict unused or unnecessary physical and logical ports/protocols on information systems.\n\nOperating systems are capable of providing a wide variety of functions and services. Some of the functions and services provided by default may not be necessary to support essential organizational operations. Additionally, it is sometimes convenient to provide multiple services from a single component (e.g., VPN and IPS); however, doing so increases risk over limiting the services provided by any one component.\n\nTo support the requirements and principles of least functionality, the operating system must support the organizational requirements, providing only essential capabilities and limiting the use of ports, protocols, and/or services to only those required, authorized, and approved to conduct official business or to address authorized quality of life issues.\n\nSatisfies: SRG-OS-000096-GPOS-00050, SRG-OS-000297-GPOS-00115", "severity": "medium" }, { "id": "V-72221", "title": "A FIPS 140-2 approved cryptographic algorithm must be used for SSH communications.", "description": "Unapproved mechanisms that are used for authentication to the cryptographic module are not verified and therefore cannot be relied upon to provide confidentiality or integrity, and DoD data may be compromised.\n\nOperating systems utilizing encryption are required to use FIPS-compliant mechanisms for authenticating to cryptographic modules.\n\nFIPS 140-2 is the current standard for validating that mechanisms used to access cryptographic modules utilize authentication that meets DoD requirements. This allows for Security Levels 1, 2, 3, or 4 for use on a general purpose computing system.\n\nSatisfies: SRG-OS-000033-GPOS-00014, SRG-OS-000120-GPOS-00061, SRG-OS-000125-GPOS-00065, SRG-OS-000250-GPOS-00093, SRG-OS-000393-GPOS-00173", "severity": "medium" }, { "id": "V-72223", "title": "All network connections associated with a communication session must be terminated at the end of the session or after 10 minutes of inactivity from the user at a command prompt, except to fulfill documented and validated mission requirements.", "description": "Terminating an idle session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle session will also free up resources committed by the managed network element. \n\nTerminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.", "severity": "medium" }, { "id": "V-72225", "title": "The Standard Mandatory DoD Notice and Consent Banner must be displayed immediately prior to, or as part of, remote access logon prompts.", "description": "Display of a standardized and approved use notification before granting access to the publicly accessible operating system ensures privacy and security notification verbiage used is consistent with applicable federal laws, Executive Orders, directives, policies, regulations, standards, and guidance.\n\nSystem use notifications are required only for access via logon interfaces with human users and are not required when such human interfaces do not exist.\n\nThe banner must be formatted in accordance with applicable DoD policy. Use the following verbiage for operating systems that can accommodate banners of 1300 characters:\n\n\"You are accessing a U.S. Government (USG) Information System (IS) that is provided for USG-authorized use only.\n\nBy using this IS (which includes any device attached to this IS), you consent to the following conditions:\n\n-The USG routinely intercepts and monitors communications on this IS for purposes including, but not limited to, penetration testing, COMSEC monitoring, network operations and defense, personnel misconduct (PM), law enforcement (LE), and counterintelligence (CI) investigations.\n\n-At any time, the USG may inspect and seize data stored on this IS.\n\n-Communications using, or data stored on, this IS are not private, are subject to routine monitoring, interception, and search, and may be disclosed or used for any USG-authorized purpose.\n\n-This IS includes security measures (e.g., authentication and access controls) to protect USG interests--not for your personal benefit or privacy.\n\n-Notwithstanding the above, using this IS does not constitute consent to PM, LE or CI investigative searching or monitoring of the content of privileged communications, or work product, related to personal representation or services by attorneys, psychotherapists, or clergy, and their assistants. Such communications and work product are private and confidential. See User Agreement for details.\"\n\nSatisfies: SRG-OS-000023-GPOS-00006, SRG-OS-000024-GPOS-00007 , SRG-OS-000228-GPOS-00088", "severity": "medium" }, { "id": "V-72227", "title": "The operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) authentication communications.", "description": "Without cryptographic integrity protections, information can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.", "severity": "medium" }, { "id": "V-72229", "title": "The operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) communications.", "description": "Without cryptographic integrity protections, information can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.", "severity": "medium" }, { "id": "V-72231", "title": "The operating system must implement cryptography to protect the integrity of Lightweight Directory Access Protocol (LDAP) communications.", "description": "Without cryptographic integrity protections, information can be altered by unauthorized users without detection.\n\nCryptographic mechanisms used for protecting the integrity of information include, for example, signed hash functions using asymmetric cryptography enabling distribution of the public key to verify the hash information while maintaining the confidentiality of the key used to generate the hash.", "severity": "medium" }, { "id": "V-72233", "title": "All networked systems must have SSH installed.", "description": "Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. \n\nThis requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. \n\nProtecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, logical means (cryptography) do not have to be employed, and vice versa.\n\nSatisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000424-GPOS-00188, SRG-OS-000425-GPOS-00189, SRG-OS-000426-GPOS-00190", "severity": "medium" }, { "id": "V-72235", "title": "All networked systems must use SSH for confidentiality and integrity of transmitted and received information as well as information during preparation for transmission.", "description": "Without protection of the transmitted information, confidentiality and integrity may be compromised because unprotected communications can be intercepted and either read or altered. \n\nThis requirement applies to both internal and external networks and all types of information system components from which information can be transmitted (e.g., servers, mobile devices, notebook computers, printers, copiers, scanners, and facsimile machines). Communication paths outside the physical protection of a controlled boundary are exposed to the possibility of interception and modification. \n\nProtecting the confidentiality and integrity of organizational information can be accomplished by physical means (e.g., employing physical distribution systems) or by logical means (e.g., employing cryptographic techniques). If physical means of protection are employed, then logical means (cryptography) do not have to be employed, and vice versa.\n\nSatisfies: SRG-OS-000423-GPOS-00187, SRG-OS-000423-GPOS-00188, SRG-OS-000423-GPOS-00189, SRG-OS-000423-GPOS-00190", "severity": "medium" }, { "id": "V-72237", "title": "All network connections associated with SSH traffic must terminate at the end of the session or after 10 minutes of inactivity, except to fulfill documented and validated mission requirements.", "description": "Terminating an idle SSH session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle SSH session will also free up resources committed by the managed network element.\n\nTerminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.\n\nSatisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109", "severity": "medium" }, { "id": "V-72239", "title": "The SSH daemon must not allow authentication using RSA rhosts authentication.", "description": "Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.", "severity": "medium" }, { "id": "V-72241", "title": "All network connections associated with SSH traffic must terminate after a period of inactivity.", "description": "Terminating an idle SSH session within a short time period reduces the window of opportunity for unauthorized personnel to take control of a management session enabled on the console or console port that has been left unattended. In addition, quickly terminating an idle SSH session will also free up resources committed by the managed network element.\n\nTerminating network connections associated with communications sessions includes, for example, de-allocating associated TCP/IP address/port pairs at the operating system level and de-allocating networking assignments at the application level if multiple application sessions are using a single operating system-level network connection. This does not mean that the operating system terminates all sessions or network access; it only ends the inactive session and releases the resources associated with that session.\n\nSatisfies: SRG-OS-000163-GPOS-00072, SRG-OS-000279-GPOS-00109", "severity": "medium" }, { "id": "V-72243", "title": "The SSH daemon must not allow authentication using rhosts authentication.", "description": "Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.", "severity": "medium" }, { "id": "V-72245", "title": "The system must display the date and time of the last successful account logon upon an SSH logon.", "description": "Providing users with feedback on when account accesses via SSH last occurred facilitates user recognition and reporting of unauthorized account use.", "severity": "medium" }, { "id": "V-72247", "title": "The system must not permit direct logons to the root account using remote access via SSH.", "description": "Even though the communications channel may be encrypted, an additional layer of security is gained by extending the policy of not logging on directly as root. In addition, logging on with a user-specific account provides individual accountability of actions performed on the system.", "severity": "medium" }, { "id": "V-72249", "title": "The SSH daemon must not allow authentication using known hosts authentication.", "description": "Configuring this setting for the SSH daemon provides additional assurance that remote logon via SSH will require a password, even in the event of misconfiguration elsewhere.", "severity": "medium" }, { "id": "V-72251", "title": "The SSH daemon must be configured to only use the SSHv2 protocol.", "description": "SSHv1 is an insecure implementation of the SSH protocol and has many well-known vulnerability exploits. Exploits of the SSH daemon could provide immediate root access to the system.\n\nSatisfies: SRG-OS-000074-GPOS-00042, SRG-OS-000480-GPOS-00227", "severity": "high" }, { "id": "V-72253", "title": "The SSH daemon must be configured to only use Message Authentication Codes (MACs) employing FIPS 140-2 approved cryptographic hash algorithms.", "description": "DoD information systems are required to use FIPS 140-2 approved cryptographic hash functions. The only SSHv2 hash algorithm meeting this requirement is SHA.", "severity": "medium" }, { "id": "V-72255", "title": "The SSH public host key files must have mode 0644 or less permissive.", "description": "If a public host key file is modified by an unauthorized user, the SSH service may be compromised.", "severity": "medium" }, { "id": "V-72257", "title": "The SSH private host key files must have mode 0600 or less permissive.", "description": "If an unauthorized user obtains the private SSH host key file, the host could be impersonated.", "severity": "medium" }, { "id": "V-72259", "title": "The SSH daemon must not permit Generic Security Service Application Program Interface (GSSAPI) authentication unless needed.", "description": "GSSAPI authentication is used to provide additional authentication mechanisms to applications. Allowing GSSAPI authentication through SSH exposes the system’s GSSAPI to remote hosts, increasing the attack surface of the system. GSSAPI authentication must be disabled unless needed.", "severity": "medium" }, { "id": "V-72261", "title": "The SSH daemon must not permit Kerberos authentication unless needed.", "description": "Kerberos authentication for SSH is often implemented using Generic Security Service Application Program Interface (GSSAPI). If Kerberos is enabled through SSH, the SSH daemon provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementation may then be subject to exploitation. To reduce the attack surface of the system, the Kerberos authentication mechanism within SSH must be disabled for systems not using this capability.", "severity": "medium" }, { "id": "V-72263", "title": "The SSH daemon must perform strict mode checking of home directory configuration files.", "description": "If other users have access to modify user-specific SSH configuration files, they may be able to log on to the system as another user.", "severity": "medium" }, { "id": "V-72265", "title": "The SSH daemon must use privilege separation.", "description": "SSH daemon privilege separation causes the SSH process to drop root privileges when not needed, which would decrease the impact of software vulnerabilities in the unprivileged section.", "severity": "medium" }, { "id": "V-72267", "title": "The SSH daemon must not allow compression or must only allow compression after successful authentication.", "description": "If compression is allowed in an SSH connection prior to authentication, vulnerabilities in the compression software could result in compromise of the system from an unauthenticated connection, potentially with root privileges.", "severity": "medium" }, { "id": "V-72269", "title": "The operating system must, for networked systems, synchronize clocks with a server that is synchronized to one of the redundant United States Naval Observatory (USNO) time servers, a time server designated for the appropriate DoD network (NIPRNet/SIPRNet), and/or the Global Positioning System (GPS).", "description": "Inaccurate time stamps make it more difficult to correlate events and can lead to an inaccurate analysis. Determining the correct time a particular event occurred on a system is critical when conducting forensic analysis and investigating system events. Sources outside the configured acceptable allowance (drift) may be inaccurate.\n\nSynchronizing internal information system clocks provides uniformity of time stamps for information systems with multiple system clocks and systems connected over a network.\n\nOrganizations should consider endpoints that may not have regular access to the authoritative time server (e.g., mobile, teleworking, and tactical endpoints).\n\nSatisfies: SRG-OS-000355-GPOS-00143, SRG-OS-000356-GPOS-00144", "severity": "medium" }, { "id": "V-72271", "title": "The operating system must protect against or limit the effects of Denial of Service (DoS) attacks by validating the operating system is implementing rate-limiting measures on impacted network interfaces.", "description": "DoS is a condition when a resource is not available for legitimate users. When this occurs, the organization either cannot accomplish its mission or must operate at degraded capacity.\n\nThis requirement addresses the configuration of the operating system to mitigate the impact of DoS attacks that have occurred or are ongoing on system availability. For each system, known and potential DoS attacks must be identified and solutions for each type implemented. A variety of technologies exist to limit or, in some cases, eliminate the effects of DoS attacks (e.g., limiting processes or establishing memory partitions). Employing increased capacity and bandwidth, combined with service redundancy, may reduce the susceptibility to some DoS attacks.", "severity": "medium" }, { "id": "V-72273", "title": "The operating system must enable an application firewall, if available.", "description": "Firewalls protect computers from network attacks by blocking or limiting access to open network ports. Application firewalls limit which applications are allowed to communicate over the network.\n\nSatisfies: SRG-OS-000480-GPOS-00227, SRG-OS-000480-GPOS-00231, SRG-OS-000480-GPOS-00232", "severity": "medium" }, { "id": "V-72275", "title": "The system must display the date and time of the last successful account logon upon logon.", "description": "Providing users with feedback on when account accesses last occurred facilitates user recognition and reporting of unauthorized account use.", "severity": "low" }, { "id": "V-72277", "title": "There must be no .shosts files on the system.", "description": "The .shosts files are used to configure host-based authentication for individual users or the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.", "severity": "high" }, { "id": "V-72279", "title": "There must be no shosts.equiv files on the system.", "description": "The shosts.equiv files are used to configure host-based authentication for the system via SSH. Host-based authentication is not sufficient for preventing unauthorized access to the system, as it does not require interactive identification and authentication of a connection request, or for the use of two-factor authentication.", "severity": "high" }, { "id": "V-72281", "title": "For systems using DNS resolution, at least two name servers must be configured.", "description": "To provide availability for name resolution services, multiple redundant name servers are mandated. A failure in name resolution could lead to the failure of security functions requiring name resolution, which may include time synchronization, centralized authentication, and remote system logging.", "severity": "low" }, { "id": "V-72283", "title": "The system must not forward Internet Protocol version 4 (IPv4) source-routed packets.", "description": "Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.", "severity": "medium" }, { "id": "V-72285", "title": "The system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.", "description": "Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router.", "severity": "medium" }, { "id": "V-72287", "title": "The system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.", "description": "Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.", "severity": "medium" }, { "id": "V-72289", "title": "The system must prevent Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages from being accepted.", "description": "ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.", "severity": "medium" }, { "id": "V-72291", "title": "The system must not allow interfaces to perform Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects by default.", "description": "ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.", "severity": "medium" }, { "id": "V-72293", "title": "The system must not send Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirects.", "description": "ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages contain information from the system's route table, possibly revealing portions of the network topology.", "severity": "medium" }, { "id": "V-72295", "title": "Network interfaces must not be in promiscuous mode.", "description": "Network interfaces in promiscuous mode allow for the capture of all network traffic visible to the system. If unauthorized individuals can access these applications, it may allow then to collect information such as logon IDs, passwords, and key exchanges between systems.\n\nIf the system is being used to perform a network troubleshooting function, the use of these tools must be documented with the Information System Security Officer (ISSO) and restricted to only authorized personnel.", "severity": "medium" }, { "id": "V-72297", "title": "The system must be configured to prevent unrestricted mail relaying.", "description": "If unrestricted mail relaying is permitted, unauthorized senders could use this host as a mail relay for the purpose of sending spam or other unauthorized activity.", "severity": "medium" }, { "id": "V-72299", "title": "A File Transfer Protocol (FTP) server package must not be installed unless needed.", "description": "The FTP service provides an unencrypted remote access that does not provide for the confidentiality and integrity of user passwords or the remote session. If a privileged user were to log on using this service, the privileged user password could be compromised. SSH or other encrypted file transfer methods must be used in place of this service.", "severity": "high" }, { "id": "V-72301", "title": "The Trivial File Transfer Protocol (TFTP) server package must not be installed if not required for operational support.", "description": "If TFTP is required for operational support (such as the transmission of router configurations) its use must be documented with the Information System Security Officer (ISSO), restricted to only authorized personnel, and have access control rules established.", "severity": "high" }, { "id": "V-72303", "title": "Remote X connections for interactive users must be encrypted.", "description": "Open X displays allow an attacker to capture keystrokes and execute commands remotely.", "severity": "high" }, { "id": "V-72305", "title": "If the Trivial File Transfer Protocol (TFTP) server is required, the TFTP daemon must be configured to operate in secure mode.", "description": "Restricting TFTP to a specific directory prevents remote users from copying, transferring, or overwriting system files.", "severity": "medium" }, { "id": "V-72307", "title": "An X Windows display manager must not be installed unless approved.", "description": "Internet services that are not required for system or application processes must not be active to decrease the attack surface of the system. X Windows has a long history of security vulnerabilities and will not be used unless approved and documented.", "severity": "medium" }, { "id": "V-72309", "title": "The system must not be performing packet forwarding unless the system is a router.", "description": "Routing protocol daemons are typically used on routers to exchange network topology information with other routers. If this software is used when not required, system network information may be unnecessarily transmitted across the network.", "severity": "medium" }, { "id": "V-72311", "title": "The Network File System (NFS) must be configured to use RPCSEC_GSS.", "description": "When an NFS server is configured to use RPCSEC_SYS, a selected userid and groupid are used to handle requests from the remote user. The userid and groupid could mistakenly or maliciously be set incorrectly. The RPCSEC_GSS method of authentication uses certificates on the server and client systems to more securely authenticate the remote mount request.", "severity": "medium" }, { "id": "V-72313", "title": "SNMP community strings must be changed from the default.", "description": "Whether active or not, default Simple Network Management Protocol (SNMP) community strings must be changed to maintain security. If the service is running with the default authenticators, anyone can gather data about the system and the network and use the information to potentially compromise the integrity of the system or network(s). It is highly recommended that SNMP version 3 user authentication and message encryption be used in place of the version 2 community strings.", "severity": "high" }, { "id": "V-72315", "title": "The system access control program must be configured to grant or deny system access to specific hosts and services.", "description": "If the systems access control program is not configured with appropriate rules for allowing and denying access to system network resources, services may be accessible to unauthorized hosts.", "severity": "medium" }, { "id": "V-72317", "title": "The system must not have unauthorized IP tunnels configured.", "description": "IP tunneling mechanisms can be used to bypass network filtering. If tunneling is required, it must be documented with the Information System Security Officer (ISSO).", "severity": "medium" }, { "id": "V-72319", "title": "The system must not forward IPv6 source-routed packets.", "description": "Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv6 forwarding is enabled and the system is functioning as a router.", "severity": "medium" }, { "id": "V-72417", "title": "The operating system must have the required packages for multifactor authentication installed.", "description": "Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device.\n\nMultifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card.\n\nA privileged account is defined as an information system account with authorizations of a privileged user.\n\nRemote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.\n\nThis requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management).\n\nRequires further clarification from NIST.\n\nSatisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162", "severity": "medium" }, { "id": "V-72427", "title": "The operating system must implement multifactor authentication for access to privileged accounts via pluggable authentication modules (PAM).", "description": "Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device.\n\nMultifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card.\n\nA privileged account is defined as an information system account with authorizations of a privileged user.\n\nRemote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.\n\nThis requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management).\n\nRequires further clarification from NIST.\n\nSatisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162", "severity": "medium" }, { "id": "V-72433", "title": "The operating system must implement certificate status checking for PKI authentication.", "description": "Using an authentication device, such as a CAC or token that is separate from the information system, ensures that even if the information system is compromised, that compromise will not affect credentials stored on the authentication device.\n\nMultifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card.\n\nA privileged account is defined as an information system account with authorizations of a privileged user.\n\nRemote access is access to DoD nonpublic information systems by an authorized user (or an information system) communicating through an external, non-organization-controlled network. Remote access methods include, for example, dial-up, broadband, and wireless.\n\nThis requirement only applies to components where this is specific to the function of the device or has the concept of an organizational user (e.g., VPN, proxy capability). This does not apply to authentication for the purpose of configuring the device itself (management).\n\nRequires further clarification from NIST.\n\nSatisfies: SRG-OS-000375-GPOS-00160, SRG-OS-000375-GPOS-00161, SRG-OS-000375-GPOS-00162", "severity": "medium" }, { "id": "V-73155", "title": "The operating system must prevent a user from overriding the screensaver lock-delay setting for the graphical user interface.", "description": "A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.", "severity": "medium" }, { "id": "V-73157", "title": "The operating system must prevent a user from overriding the session idle-delay setting for the graphical user interface.", "description": "A session time-out lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not log out because of the temporary nature of the absence. Rather than relying on the user to manually lock their operating system session prior to vacating the vicinity, operating systems need to be able to identify when a user's session has idled and take action to initiate the session lock.\n\nThe session lock is implemented at the point where session activity can be determined and/or controlled.", "severity": "medium" }, { "id": "V-73159", "title": "When passwords are changed or new passwords are established, pwquality must be used.", "description": "Use of a complex password helps to increase the time and resources required to compromise the password. Password complexity, or strength, is a measure of the effectiveness of a password in resisting attempts at guessing and brute-force attacks. “pwquality” enforces complex password construction configuration and has the ability to limit brute-force attacks on the system.", "severity": "medium" }, { "id": "V-73161", "title": "File systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.", "description": "The \"noexec\" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files as they may be incompatible. Executing files from untrusted file systems increases the opportunity for unprivileged users to attain unauthorized administrative access.", "severity": "medium" }, { "id": "V-73163", "title": "The audit system must take appropriate action when there is an error sending audit records to a remote system.", "description": "Taking appropriate action when there is an error sending audit records to a remote system will minimize the possibility of losing audit records.", "severity": "medium" }, { "id": "V-73165", "title": "The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/group.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).", "severity": "medium" }, { "id": "V-73167", "title": "The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/gshadow.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).", "severity": "medium" }, { "id": "V-73171", "title": "The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/shadow.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).", "severity": "medium" }, { "id": "V-73173", "title": "The operating system must generate audit records for all account creations, modifications, disabling, and termination events that affect /etc/opasswd.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one.\n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).", "severity": "medium" }, { "id": "V-73175", "title": "The system must ignore Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) redirect messages.", "description": "ICMP redirect messages are used by routers to inform hosts that a more direct route exists for a particular destination. These messages modify the host's route table and are unauthenticated. An illicit ICMP redirect message could result in a man-in-the-middle attack.", "severity": "medium" }, { "id": "V-73177", "title": "Wireless network adapters must be disabled.", "description": "The use of wireless networking can introduce many different attack vectors into the organization's network. Common attack vectors such as malicious association and ad hoc networks will allow an attacker to spoof a wireless access point (AP), allowing validated systems to connect to the malicious AP and enabling the attacker to monitor and record network traffic. These malicious APs can also serve to create a man-in-the-middle attack or be used to create a denial of service to valid network resources.", "severity": "medium" }, { "id": "V-77819", "title": "The operating system must uniquely identify and must authenticate users using multifactor authentication via a graphical user logon.", "description": "To assure accountability and prevent unauthenticated access, users must be identified and authenticated to prevent potential misuse and compromise of the system.\n\nMultifactor solutions that require devices separate from information systems gaining access include, for example, hardware tokens providing time-based or challenge-response authenticators and smart cards such as the U.S. Government Personal Identity Verification card and the DoD Common Access Card.\n\n\nSatisfies: SRG-OS-000375-GPOS-00161,SRG-OS-000375-GPOS-00162\n", "severity": "medium" }, { "id": "V-77821", "title": "The Datagram Congestion Control Protocol (DCCP) kernel module must be disabled unless required.", "description": "Disabling DCCP protects the system against exploitation of any flaws in the protocol implementation.", "severity": "medium" }, { "id": "V-77823", "title": "The operating system must require authentication upon booting into single-user and maintenance modes.", "description": "If the system does not require valid root authentication before it boots into single-user or maintenance mode, anyone who invokes single-user or maintenance mode is granted privileged access to all files on the system.", "severity": "medium" }, { "id": "V-77825", "title": "The operating system must implement virtual address space randomization.", "description": "Address space layout randomization (ASLR) makes it more difficult for an attacker to predict the location of attack code he or she has introduced into a process's address space during an attempt at exploitation. Additionally, ASLR also makes it more difficult for an attacker to know the location of existing code in order to repurpose it using return-oriented programming (ROP) techniques.", "severity": "medium" }, { "id": "V-78995", "title": "The operating system must prevent a user from overriding the screensaver lock-enabled setting for the graphical user interface.", "description": "A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.\n\nThe session lock is implemented at the point where session activity can be determined.\n\nThe ability to enable/disable a session lock is given to the user by default. Disabling the user’s ability to disengage the graphical user interface session lock provides the assurance that all sessions will lock after the specified period of time.\n", "severity": "medium" }, { "id": "V-78997", "title": "The operating system must prevent a user from overriding the screensaver idle-activation-enabled setting for the graphical user interface.", "description": "A session lock is a temporary action taken when a user stops work and moves away from the immediate physical vicinity of the information system but does not want to log out because of the temporary nature of the absence.\n\nThe session lock is implemented at the point where session activity can be determined.\n\nThe ability to enable/disable a session lock is given to the user by default. Disabling the user’s ability to disengage the graphical user interface session lock provides the assurance that all sessions will lock after the specified period of time.\n", "severity": "medium" }, { "id": "V-78999", "title": "All uses of the create_module command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" }, { "id": "V-79001", "title": "All uses of the finit_module command must be audited.", "description": "Without generating audit records that are specific to the security and mission needs of the organization, it would be difficult to establish, correlate, and investigate the events relating to an incident or identify those responsible for one. \n\nAudit records can be generated from various components within the information system (e.g., module or policy filter).\n\nSatisfies: SRG-OS-000471-GPOS-00216, SRG-OS-000477-GPOS-00222", "severity": "medium" } ] }