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Server freezed in Skulltag 0.97d2-RC2
From: Luigi Auriemma <aluigi () autistici org>
Date: Mon, 16 Jun 2008 22:50:57 +0100


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

                             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


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


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


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

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


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


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

======
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.


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

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


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


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

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


Version 0.97d2-RC3


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


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

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