bugtraq - Buffer-overflow in GO-Global for Windows 3.1.0.3270

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Message-ID: <20051102201927.5ab3e028.aluigi@autistici.org>
Date: Wed, 2 Nov 2005 20:19:27 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com,
	news@...uriteam.com, full-disclosure@...ts.grok.org.uk, vuln@...unia.com
Subject: Buffer-overflow in GO-Global for Windows
	3.1.0.3270



#######################################################################

                             Luigi Auriemma

Application:  GO-Global for Windows
              http://www.graphon.com/products/GO-GlobalforWindows.shtml
Versions:     <= 3.1.0.3270
Platforms:    Server:  Windows
              Clients: Windows, Solaris, HP-UX, IBM AIX and Linux
                       Java version not vulnerable
Bug:          buffer-overflow
Exploitation: remote, versus server and client
Date:         02 Nov 2005
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    http://aluigi.altervista.org


#######################################################################


1) Introduction
2) Bug
3) The Code
4) Fix


#######################################################################

===============
1) Introduction
===============


GO-Global for Windows is a server-based thin-client solution.
It allows users to run 32-bit Windows applications remotely from a
server, the application runs entirely on the server but is displayed on
the client.


#######################################################################

======
2) Bug
======


After the initial handshake where is specified the type of encryption
to use (_USERSA_), the application uses 16 bit fields for specifying
the length of the subsequent data blocks.
Both the client and the server use a small buffer which leads to a
buffer-overflow if an attacker uses a data block longer than its size.
Both server and clients are vulnerables.


#######################################################################

===========
3) The Code
===========


For testing the "GO-Global for Windows" server:
  http://aluigi.altervista.org/poc/ggwbof.zip

For testing the "GO-Global for Windows" clients:
  http://aluigi.altervista.org/poc/ggwbofc.zip


#######################################################################

======
4) Fix
======


Version 3.1.0.3281


#######################################################################


--- 
Luigi Auriemma 
http://aluigi.altervista.org 
_______________________________________________
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