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TUCoPS :: Games :: tb12270.htm

Heap overflow in Skulltag 0.97d-beta4.1



Heap overflow in Skulltag 0.97d-beta4.1
Heap overflow in Skulltag 0.97d-beta4.1




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                             Luigi Auriemma

Application:  Skulltag
http://www.skulltag.com 
Versions:     <= 0.97d-beta4.1
Platforms:    Windows and Linux
Bug:          heap-overflow
Exploitation: remote, versus server
Date:         23 Aug 2007
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 well known and played Doom engine mainly based on Zdoom
(but not open source as it) and focused on online gaming.


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

The game is vulnerable to a heap overflow located in the function which
performs the huffman decompression of the incoming packets, allowing
possible malicious code execution through a single UDP packet.


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

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


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

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

No fix.
Developers have not been contacted since one year ago the format string
vulnerability I reported to them was handled as a normal bug and the
patch was released some months after my advisory.


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


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


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