full-disclosure - Broadcast buffer-overflow in Vypress Messenger 3.5.1

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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


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

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


Vypress Messenger is an intranet Windows application for exchanging
messages.


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

======
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