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Category:   Application (Game)  >   Colin McRae Rally 04 Vendors:   Codemasters Software Company Limited
Colin McRae Rally 04 'numplayers' Error Lets Remote Users Block the Game Network
SecurityTracker Alert ID:  1010399
SecurityTracker URL:  http://securitytracker.com/id/1010399
CVE Reference:   GENERIC-MAP-NOMATCH   (Links to External Site)
Date:  Jun 4 2004
Impact:   Denial of service via network
Exploit Included:  Yes  
Version(s): 1.0
Description:   Luigi Auriemma reported a vulnerability in the 'Colin McRae Rally 04' game software. A remote user with a malicious game server can disrupt the entire game network.

It is reported that if the server returns a value to the target client for the 'numplayers' variable that is too high, the target client will crash. Because a client automatically requests information from all available online servers, a single malicious server can block the entire game network, the report said.

A demonstration exploit is available at:

http://aluigi.altervista.org/poc/cmr4cdos.zip

The vendor has reportedly been notified.

Impact:   A remote user operating a malicious server can block the game network.
Solution:   No solution was available at the time of this entry.
Vendor URL:  wwww.codemasters.com/colinmcraerally04 (Links to External Site)
Cause:   Exception handling error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Colin McRae Rally 04 broadcast clients crash


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

                              Luigi Auriemma

Application:  Colin McRae Rally 04
               http://www.codemasters.com/colinmcraerally04/
Versions:     1.0
Platforms:    Windows
Bug:          bad allocation (?)
Risk:         medium
Exploitation: remote, versus clients (broadcast)
Date:         04 June 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
===============


Colin McRae Rally 04 is the famous rally game developed by Codemasters
and released at the beginning of April 2004.


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

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


The bug is in a value that the servers send back to the clients when
they enter in the multiplayer menu.
The bugged value is the number of players in the server ("numplayers"),
if it is too high it causes the crash of the client.

Due the location of the bug, any vulnerable client can't play online
because it automatically requests informations to all the online
servers so a single malicious server can passively block the entire
game network.


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

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


http://aluigi.altervista.org/poc/cmr4cdos.zip


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

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


No fix.
Two months for a patch is not what I mean with "quick fix".
The bug was found just two days after the pubblic release of the game
and quickly noticed to the developers, but no patch has been released
yet.


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


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


 
 


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