full-disclosure - In-game format string in Judge Dredd vs. Death 1.01

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From: aluigi at autistici.org (Luigi Auriemma)
Subject: In-game format string in Judge Dredd vs. Death 1.01

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                             Luigi Auriemma

Application:  Judge Dredd: Dredd vs. Death
              http://www.dreddvsdeath.com
Versions:     <= 1.01
Platforms:    Windows
Bug:          format string
Exploitation: remote, versus server (in-game)
Date:         02 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
===============

Dredd vs Death is a cool FPS game based on the homonym comic strip.
The game has been developed by Rebellion (http://www.rebellion.co.uk)
and has been released in October 2003.

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

The problem is a format string bug in the handling of the messages
received from clients like "player connected", chat messages and so on.

Like any in-game bug, the attacker must have access to the match (so if
the server is protected by password, he must know it).

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

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

Launch a client and a server, go on the client side, join the server
and send the following chat message (by default pressing the 'T' key):

  %n%n%n%n%n

The server will crash immediately.

You can do the same check running only the server and sending the chat
message from the same computer.

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

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

No fix.
Developers have not replied to my mails.

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

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