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  Skulltag game server DoS

From:Luigi Auriemma <aluigi_(at)_autistici.org>
Date:17.06.2008
Subject:Server freezed in Skulltag 0.97d2-RC2


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                            Luigi Auriemma

Application:  Skulltag
             http://www.skulltag.com
Versions:     <= 0.97d2-RC2
Platforms:    Windows, Linux and FreeBSD
Bug:          loop during the parsing of the packets
Exploitation: remote, versus server
Date:         16 Jun 2008
Author:       Luigi Auriemma
             e-mail: aluigi@autistici.org
             web:    aluigi.org


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1) Introduction
2) Bug
3) The Code
4) Fix


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===============
1) Introduction
===============


Skulltag is a port of the original Doom mainly focused on multiplayer
gaming.


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


Skulltag is affected by a problem in the parsing of some packets with
the result of freezing the entine server for some seconds through the
sending of a single big malformed packet which is parsed multiple
times.
This Denial of Service can be made endless using multiple malformed
packets at regular intervals.


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


http://aluigi.org/poc/skulltagloop.zip


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


Version 0.97d2-RC3


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

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