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Foxit WAC Server 2.0 Build 3503 - Heap overflows



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




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                             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@autistici.org 
              web:    aluigi.org


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


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

WAC is a commercial SSH/telnet server for Windows.


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======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.


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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.


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

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


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

No fix


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

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