bugtraq - Broadcast crash in Popmessenger 1.60 (before 20 Sep 2004)

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Message-ID: <20040921184831.4fef0db6.aluigi@autistici.org>
Date: Tue, 21 Sep 2004 18:48:31 +0000
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com, news@...uriteam.com,
   full-disclosure@...ts.netsys.com, vuln@...unia.com
Subject: Broadcast crash in Popmessenger 1.60 (before 20 Sep 2004)

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

                             Luigi Auriemma

Application:  PopMessenger
              http://www.leadmind.com
Versions:     <= 1.60 (before 20 Sep 2004)
Platforms:    Windows
Bug:          crash
Risk:         medium
Exploitation: remote (broadcast)
Date:         21 September 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
===============

PopMessenger is a LAN messenger for Windows with some features.

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

======
2) Bug
======

The messages exchanged with this program are encrypted with the
Blowfish algorithm and then converted to plain-text with Base64.

The problem is located just in the Base64 function because the program
shows an alert dialog if there are illegal chars in a message (like %
or _).
After about 15 consecutive dialogs the program definitely crashs.

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

===========
3) The Code
===========

http://aluigi.altervista.org/poc/popmsgboom.zip

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

======
4) Fix
======

The vendor has released a new version without changing the version
number (1.60).
All the programs downloaded after the 20 September 2004 are not
vulnerable.

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

--- 
Luigi Auriemma
http://aluigi.altervista.org

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