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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 (at) autistici (dot) org [email concealed]
web: aluigi.org

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

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1) Introduction
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WAC is a commercial SSH/telnet server for Windows.

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2) Bugs
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A] telnet option heap overflow
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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
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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
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http://aluigi.org/poc/wachof.zip

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4) Fix
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No fix

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Luigi Auriemma
http://aluigi.org

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