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Contents
require 'brakeman/checks/base_check'
# Checks for string interpolation and parameters in calls to
# String#constantize, String#safe_constantize, Module#const_get and Module#qualified_const_get.
#
# Exploit examples at: http://blog.conviso.com.br/2013/02/exploiting-unsafe-reflection-in.html
class Brakeman::CheckUnsafeReflection < Brakeman::BaseCheck
Brakeman::Checks.add self
@description = "Checks for Unsafe Reflection"
def run_check
reflection_methods = [:constantize, :safe_constantize, :const_get, :qualified_const_get]
tracker.find_call(:methods => reflection_methods, :nested => true).each do |result|
check_unsafe_reflection result
end
end
def check_unsafe_reflection result
return if duplicate? result or result[:call].original_line
add_result result
call = result[:call]
method = call.method
case method
when :constantize, :safe_constantize
arg = call.target
else
arg = call.first_arg
end
if input = has_immediate_user_input?(arg)
confidence = CONFIDENCE[:high]
elsif input = include_user_input?(arg)
confidence = CONFIDENCE[:med]
end
if confidence
message = "Unsafe Reflection method #{method} called with #{friendly_type_of input}"
warn :result => result,
:warning_type => "Remote Code Execution",
:warning_code => :unsafe_constantize,
:message => message,
:user_input => input.match,
:confidence => confidence
end
end
end
Version data entries
10 entries across 10 versions & 2 rubygems