bugtraq - Two heap overflow in Foxit WAC Server 2.0 Build 3503

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Date: Tue, 19 Feb 2008 23:10:16 +0100
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, news@...uriteam.com,
	full-disclosure@...ts.grok.org.uk, vuln@...unia.com,
	packet@...ketstormsecurity.org
Subject: Two heap overflow in Foxit WAC Server 2.0 Build 3503


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

                             Luigi Auriemma

Application:  Foxit Remote Access Server (WAC Server)
              http://www.foxitsoft.com/wac/server_intro.php
Versions:     <= 2.0 Build 3503
Platforms:    Windows
Bugs:         A] telnet option heap overflow
              B] SSH packet heap overflow
Exploitation: remote
Date:         16 Feb 2008
Author:       Luigi Auriemma
              e-mail: aluigi@...istici.org
              web:    aluigi.org


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


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


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


WAC is a commercial SSH/telnet server for Windows.


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

=======
2) Bugs
=======

------------------------------
A] telnet option heap overflow
------------------------------

The WAC server is vulnerable to a heap overflow exploitable through the
usage of options longer than 260 bytes.

Note: this bug was wrongly reported by me as a crash and with a wrong
server version one month ago.


---------------------------
B] SSH packet heap overflow
---------------------------

The server is affected also by another heap overflow exploitable
through big SSH packets, anyway no deeper research has been performed
on this vulnerability.


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

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


http://aluigi.org/poc/wachof.zip


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

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


No fix


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


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