what you don't know can hurt you

judgedredd.txt

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

Judge Dredd: Dredd vs. Death versions 1.01 and below suffer from a format string vulnerability.

tags | advisory
MD5 | a0ec22e03ff5f5e36f7ea45beb2676f1

judgedredd.txt

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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@altervista.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.


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

======
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

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