Class: Brakeman::CheckRenderDoS

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

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

#array?, #block?, #call?, #camelize, #class_name, #constant?, #contains_class?, #cookies?, #dir_glob?, #false?, #hash?, #hash_access, #hash_insert, #hash_iterate, #integer?, #kwsplat?, #literal?, #make_call, #node_type?, #number?, #params?, #pluralize, #rails_version, #regexp?, #remove_kwsplat, #request_env?, #request_value?, #result?, #safe_literal, #safe_literal?, #safe_literal_target?, #set_env_defaults, #sexp?, #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

#run_checkObject


8
9
10
11
12
13
14
15
16
17
18
19
20
# File 'lib/brakeman/checks/check_render_dos.rb', line 8

def run_check
  if version_between? "3.0.0", "3.0.20" or
     version_between? "3.1.0", "3.1.12" or
     version_between? "3.2.0", "3.2.16"

    tracker.find_call(:target => nil, :method => :render).each do |result|
      if text_render? result
        warn_about_text_render
        break
      end
    end
  end
end

#text_render?(result) ⇒ Boolean

Returns:

  • (Boolean)

22
23
24
25
# File 'lib/brakeman/checks/check_render_dos.rb', line 22

def text_render? result
  node_type? result[:call], :render and
  result[:call].render_type == :text
end

#warn_about_text_renderObject


27
28
29
30
31
32
33
34
35
36
# File 'lib/brakeman/checks/check_render_dos.rb', line 27

def warn_about_text_render
  message = msg(msg_version(rails_version), " has a denial of service vulnerability ", msg_cve("CVE-2014-0082"), ". Upgrade to ", msg_version("3.2.17"))

  warn :warning_type => "Denial of Service",
    :warning_code => :CVE_2014_0082,
    :message => message,
    :confidence => :high,
    :link_path => "https://groups.google.com/d/msg/rubyonrails-security/LMxO_3_eCuc/ozGBEhKaJbIJ",
    :gem_info => gemfile_or_environment
end