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wachof.txt

wachof.txt
Posted Feb 20, 2008
Authored by Luigi Auriemma | Site aluigi.org

Foxit Remote Access Server (WAC Server) versions 2.0 Build 3503 and below suffer from telnet option heap overflow and SSH packet heap overflow vulnerabilities.

tags | advisory, remote, overflow, vulnerability
SHA-256 | cd014c3ceaa4c6c69e746bef5f8da1c55082a58e2033550c9d7d767ba4543428

wachof.txt

Change Mirror Download

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

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


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


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


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

===============
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
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