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                             Luigi Auriemma

Application:  netPanzer
http://www.netpanzer.org 
http://netpanzer.berlios.de 
Versions:     <= 0.8 (rev 952)
Platforms:    *nix, *BSD, Windown, Mac and others
Bug:          server termination
Exploitation: remote, versus server
Date:         23 May 2006
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
==============

netPanzer is a nice and well known open source multiplayer strategy
game.


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

The game is affected by a denial of service which happens when a client
uses a flag (called also frameNum) major than 41 since the setFrame
function in src/Lib/2D/Surface.hpp checks if this number is minor than
frameCount:

    void setFrame(const float &frameNum)
    {
        assert(frameNum >= 0.0);
        assert(frameNum < frameCount);
        mem = frame0 + (pix.y * stride) * int(frameNum);
    }

The result is the immediate interruption of the server:

netpanzer: src/Lib/2D/Surface.hpp:370: void Surface::setFrame(const
float&): Assertion `frameNum < frameCount' failed. Received signal
SIGABRT(6) aborting and trying to shutdown.
Closing logfile.
Aborted


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

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


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

No fix.
No reply from the developers.


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