Class: Brakeman::CheckJSONEncoding

Inherits:
BaseCheck show all
Defined in:
lib/brakeman/checks/check_json_encoding.rb

Constant Summary

Constants inherited from BaseCheck

BaseCheck::CONFIDENCE

Constants included from Util

Util::ALL_COOKIES, Util::ALL_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::DIR_CONST, Util::LITERALS, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_COOKIES, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::REQUEST_REQUEST_PARAMETERS, Util::SAFE_LITERAL, Util::SESSION, Util::SESSION_SEXP, Util::SIMPLE_LITERALS

Constants inherited from SexpProcessor

SexpProcessor::VERSION

Instance Attribute Summary

Attributes inherited from BaseCheck

#tracker, #warnings

Attributes inherited from SexpProcessor

#context, #env, #expected

Instance Method Summary collapse

Methods inherited from BaseCheck

#add_result, inherited, #initialize, #process_array, #process_call, #process_cookies, #process_default, #process_dstr, #process_if, #process_params

Methods included from Messages

#msg, #msg_code, #msg_cve, #msg_file, #msg_input, #msg_lit, #msg_plain, #msg_version

Methods included from Util

#all_literals?, #array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #cookies?, #dir_glob?, #false?, #hash?, #hash_access, #hash_insert, #hash_iterate, #hash_values, #integer?, #kwsplat?, #literal?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #recurse_check?, #regexp?, #remove_kwsplat, #request_headers?, #request_value?, #result?, #safe_literal, #safe_literal?, #safe_literal_target?, #set_env_defaults, #sexp?, #simple_literal?, #string?, #string_interp?, #symbol?, #template_path_to_name, #true?, #underscore

Methods included from ProcessorHelper

#current_file, #process_all, #process_all!, #process_call_args, #process_call_defn?, #process_class, #process_module

Methods inherited from SexpProcessor

#in_context, #initialize, #process, processors, #scope

Constructor Details

This class inherits a constructor from Brakeman::BaseCheck

Instance Method Details

#has_workaround? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/brakeman/checks/check_json_encoding.rb', line 34

def has_workaround?
  workaround = s(:module, :ActiveSupport,
                 s(:module, :JSON,
                   s(:module, :Encoding,
                     s(:call, nil, :private),
                     s(:class, :EscapedString, nil,
                       s(:defn, :to_s,
                         s(:args),
                         s(:self))))))

  tracker.initializers.any? do |_name, initializer|
    initializer == workaround
  end
end

#run_check ⇒ Object 



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

def run_check
  if (version_between? "4.1.0", "4.1.10" or version_between? "4.2.0", "4.2.1") and not has_workaround?
    message = msg(msg_version(rails_version), " does not encode JSON keys ", msg_cve("CVE-2015-3226"), ". Upgrade to ")

    if version_between? "4.1.0", "4.1.10"
      message << msg_version("4.1.11")
    else
      message << msg_version("4.2.2")
    end

    if tracker.find_call(:methods => [:to_json, :encode]).any?
      confidence = :high
    else
      confidence = :medium
    end

    warn :warning_type => "Cross-Site Scripting",
      :warning_code => :CVE_2015_3226,
      :message => message,
      :confidence => confidence,
      :gem_info => gemfile_or_environment,
      :link_path => "https://groups.google.com/d/msg/rubyonrails-security/7VlB_pck3hU/3QZrGIaQW6cJ",
      :cwe_id => [79]
  end
end