NULL pointer crash in World in Conflict 1.000

[Luigi Auriemma <aluigi () autistici org>]

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                             Luigi Auriemma

Application:  World in Conflict
              http://www.worldinconflict.com
Versions:     <= 1.000
Platforms:    Windows
Bug:          access to NULL pointer
Exploitation: remote, versus server
Date:         09 Oct 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
===============


World in conflict is a RTS game developed by Massive Entertainment
(http://www.massive.se) and released about a month ago.


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2) Bug
======


The server is vulneable to a Denial of Service attack (crash) caused by
the access to a NULL pointer.
The problem happens in the GetMagicNumberString function which takes
the third byte of the data received from the client on the VOIP port
52999 and returns a text string if this value is valid ("ABC" for type
0, "DEF" for 1, "GHI" for 2 and so on) or NULL if it's invalid.
Then the string returned by this function is compared with another one
and here happens the NULL pointer access.


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


Connect to the VOIP port of the server (default 52999) with telnet or
netcat and type something like aaaaaaa.
The server will crash immediately.


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4) Fix
======


Patch v1.001 (aka Update #001)


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