lib/brakeman/checks/check_mail_to.rb
require 'brakeman/checks/base_check'
#Check for cross-site scripting vulnerability in mail_to :encode => :javascript
#with certain versions of Rails (< 2.3.11 or < 3.0.4).
#
#http://groups.google.com/group/rubyonrails-security/browse_thread/thread/f02a48ede8315f81
class Brakeman::CheckMailTo < Brakeman::BaseCheck
Brakeman::Checks.add self
@description = "Checks for mail_to XSS vulnerability in certain versions"
def run_check
if (version_between? "2.3.0", "2.3.10" or version_between? "3.0.0", "3.0.3") and result = mail_to_javascript?
message = msg("Vulnerability in ", msg_code("mail_to"), " using javascript encoding ", msg_cve("CVE-2011-0446"), ". Upgrade to ")
if version_between? "2.3.0", "2.3.10"
message << msg_version("2.3.11")
else
message << msg_version("3.0.4")
end
warn :result => result,
:warning_type => "Mail Link",
:warning_code => :CVE_2011_0446,
:message => message,
:confidence => :high,
:gem_info => gemfile_or_environment, # Probably ignored now
:link_path => "https://groups.google.com/d/topic/rubyonrails-security/8CpI7egxX4E/discussion",
:cwe_id => [79]
end
end
#Check for javascript encoding of mail_to address
# mail_to email, name, :encode => :javascript
def mail_to_javascript?
Brakeman.debug "Checking calls to mail_to for javascript encoding"
tracker.find_call(:target => false, :method => :mail_to).each do |result|
result[:call].each_arg do |arg|
if hash? arg
if option = hash_access(arg, :encode)
return result if symbol? option and option.value == :javascript
end
end
end
end
false
end
end