Class: Brakeman::CheckSelectTag

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

Overview

Checks for CVE-2012-3463, unescaped input in :prompt option of select_tag: groups.google.com/d/topic/rubyonrails-security/fV3QUToSMSw/discussion

Constant Summary

Constants inherited from BaseCheck

BaseCheck::CONFIDENCE

Constants included from Util

Util::ALL_PARAMETERS, Util::COOKIES, Util::PARAMETERS, Util::PATH_PARAMETERS, Util::QUERY_PARAMETERS, Util::REQUEST_ENV, Util::REQUEST_PARAMETERS, Util::REQUEST_PARAMS, Util::SESSION

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, #initialize, #process_call, #process_cookies, #process_default, #process_if, #process_params

Methods included from Util

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

Methods included from ProcessorHelper

#class_name, #process_all, #process_module

Methods inherited from SexpProcessor

#error_handler, #in_context, #initialize, #process, #process_dummy, #scope

Constructor Details

This class inherits a constructor from Brakeman::BaseCheck

Instance Method Details

#process_result(result) ⇒ Object

Check if select_tag is called with user input in :prompt option



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# File 'lib/brakeman/checks/check_select_tag.rb', line 36

def process_result result
  return if duplicate? result
  add_result result

  #Only concerned if user input is supplied for :prompt option
  last_arg = result[:call].arglist.last

  if hash? last_arg
    prompt_option = hash_access last_arg, :prompt

    if call? prompt_option and @ignore_methods.include? prompt_option.method
      return
    elsif sexp? prompt_option and input = include_user_input?(prompt_option)

      warn :warning_type => "Cross Site Scripting",
        :result => result,
        :message => @message,
        :confidence => CONFIDENCE[:high],
        :user_input => input.match,
        :link_path => "https://groups.google.com/d/topic/rubyonrails-security/fV3QUToSMSw/discussion"
    end
  end
end

#run_check ⇒ Object 



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# File 'lib/brakeman/checks/check_select_tag.rb', line 10

def run_check

  if version_between? "3.0.0", "3.0.16"
    suggested_version = "3.0.17"
  elsif version_between? "3.1.0", "3.1.7"
    suggested_version = "3.1.8"
  elsif version_between? "3.2.0", "3.2.7"
    suggested_version = "3.2.8"
  else
    return
  end

  @ignore_methods = Set[:escapeHTML, :escape_once, :h].merge tracker.options[:safe_methods]

  @message = "Upgrade to Rails #{suggested_version}, #{tracker.config[:rails_version]} select_tag is vulnerable (CVE-2012-3463)"

  calls = tracker.find_call(:target => nil, :method => :select_tag).select do |result|
    result[:location][0] == :template
  end

  calls.each do |result|
    process_result result
  end
end