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

2004-10-04T00:00:00
ID SECURITYVULNS:DOC:6921
Type securityvulns
Reporter Securityvulns
Modified 2004-10-04T00:00:00

Description

                         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