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From: aluigi at autistici.org (Luigi Auriemma)
Subject: Broadcast buffer-overflow in Vypress Messenger 3.5.1
#######################################################################
Luigi Auriemma
Application: Vypress Messenger
http://www.vypress.com/products/messenger/
Versions: <= 3.5.1
Platforms: Windows
Bug: buffer overflow
Risk: critical
Exploitation: remote, broadcast
Date: 01 October 2004
Author: Luigi Auriemma
e-mail: aluigi@...ervista.org
web: http://aluigi.altervista.org
#######################################################################
1) Introduction
2) Bug
3) The Code
4) Fix
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===============
1) Introduction
===============
Vypress Messenger is an intranet Windows application for exchanging
messages.
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======
2) Bug
======
A visualization function in the program is affected by a
buffer-overflow bug exploitable using 776 chars in the field #1 of a
message.
Due to the intranet nature of the program is possible to exploit any
host in the LAN simply sending the malicious message to a broadcast
address.
#######################################################################
===========
3) The Code
===========
http://aluigi.altervista.org/poc/vymesbof.zip
#######################################################################
======
4) Fix
======
Version 4.0 RC1:
http://www.vypress.com/previews/
#######################################################################
---
Luigi Auriemma
http://aluigi.altervista.org
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