exploit the possibilities

vypressmesg.txt

vypressmesg.txt
Posted Oct 13, 2004
Authored by Luigi Auriemma | Site aluigi.altervista.org

The visualization function in Vypress Messenger versions 3.5.1 and below suffers from a buffer overflow bug.

tags | advisory, overflow
MD5 | 8f8ad59bde08aa0f48653b8d83758829

vypressmesg.txt

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

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@altervista.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

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