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_PARAMETERS, Util::COOKIES, Util::COOKIES_SEXP, Util::PARAMETERS, Util::PARAMS_SEXP, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::SESSION, Util::SESSION_SEXP

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_call, #process_cookies, #process_default, #process_dstr, #process_if, #process_params

Methods included from Util

#array?, #block?, #call?, #camelize, #class_name, #contains_class?, #context_for, #cookies?, #false?, #file_by_name, #file_for, #github_url, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #regexp?, #relative_path, #request_env?, #request_value?, #result?, #set_env_defaults, #sexp?, #string?, #string_interp?, #symbol?, #table_to_csv, #template_path_to_name, #true?, #truncate_table, #underscore

Methods included from ProcessorHelper

#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 33

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 = "Rails #{rails_version} does not encode JSON keys (CVE-2015-3226). Upgrade to Rails version "

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

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