Class: Brakeman::CheckRenderRCE

Inherits:
CheckRender show all
Defined in:
lib/brakeman/checks/check_render_rce.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 CheckRender

#check_for_dynamic_path, #known_renderable_class?, #renderable?, #safe_param?

Methods inherited from BaseCheck

#add_result, description, 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

#check_for_rce(result) ⇒ Object 



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# File 'lib/brakeman/checks/check_render_rce.rb', line 23

def check_for_rce result
  return unless version_between? "0.0.0", "3.2.22" or
                version_between? "4.0.0", "4.1.14" or
                version_between? "4.2.0", "4.2.5"

  view = result[:call][2]
  if sexp? view and not duplicate? result
    if params? view and not safe_param? view
      add_result result

      warn :result => result,
        :warning_type => "Remote Code Execution",
        :warning_code => :dynamic_render_path_rce,
        :message => msg("Passing query parameters to ", msg_code("render"), " is vulnerable in ", msg_version(rails_version), " ", msg_cve("CVE-2016-0752")),
        :user_input => view,
        :confidence => :high,
        :cwe_id => [22]
    end
  end
end

#process_render_result(result) ⇒ Object 



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# File 'lib/brakeman/checks/check_render_rce.rb', line 14

def process_render_result result
  return unless node_type? result[:call], :render

  case result[:call].render_type
  when :partial, :template, :action, :file
    check_for_rce(result)
  end
end

#run_check ⇒ Object 



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

def run_check
  tracker.find_call(:target => nil, :method => :render).each do |result|
    process_render_result result
  end
end