Two heap overflow in Foxit WAC Server 2.0 Build 3503

2008-02-20T00:00:00
ID SECURITYVULNS:DOC:19220
Type securityvulns
Reporter Securityvulns
Modified 2008-02-20T00:00:00

Description

                         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