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TUCoPS :: Games :: bx3525.htm

Server freezed in Skulltag 0.97d2-RC2



Server freezed in Skulltag 0.97d2-RC2
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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