Class: Brakeman::CheckXMLDoS

Inherits:
BaseCheck
  • Object
show all
Defined in:
lib/brakeman/checks/check_xml_dos.rb

Instance Method Summary collapse

Instance Method Details

#has_workaround? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/checks/check_xml_dos.rb', line 37

def has_workaround?
  tracker.find_call(target: :"ActiveSupport::XmlMini", method: :backend=).any? do |match|
    arg = match[:call].first_arg
    if string? arg
      value = arg.value
      value == 'Nokogiri' or value == 'LibXML'
    end
  end
end

#run_check ⇒ Object 



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# File 'lib/brakeman/checks/check_xml_dos.rb', line 8

def run_check
  version = rails_version

  fix_version = case
                when version_between?("2.0.0", "3.2.21")
                  "3.2.22"
                when version_between?("4.1.0", "4.1.10")
                  "4.1.11"
                when version_between?("4.2.0", "4.2.1")
                  "4.2.2"
                when version_between?("4.0.0", "4.0.99")
                  "4.2.2"
                else
                  return
                end

  return if has_workaround?

  message = msg(msg_version(version), " is vulnerable to denial of service via XML parsing ", msg_cve("CVE-2015-3227"), ". Upgrade to ", msg_version(fix_version))

  warn :warning_type => "Denial of Service",
    :warning_code => :CVE_2015_3227,
    :message => message,
    :confidence => :medium,
    :gem_info => gemfile_or_environment,
    :link_path => "https://groups.google.com/d/msg/rubyonrails-security/bahr2JLnxvk/x4EocXnHPp8J",
    :cwe_id => [125]
end