Memory corruption and NULL pointer in Unreal Tournament III 1.2

[Luigi Auriemma <aluigi () autistici org>]

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

                             Luigi Auriemma

Application:  Unreal Tournament III
              http://www.unrealtournament3.com
Versions:     <= 1.2 and 1.3beta4
Platforms:    Windows (tested), Linux, PS3 and Xbox360
Bugs:         A] memory corruption
              B] NULL pointer
Exploitation: remote, versus server
Date:         30 Jul 2008
Author:       Luigi Auriemma
              e-mail: aluigi () autistici org
              web:    aluigi.org


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


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


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

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


Unreal Tournament III is the latest game (2007) of the Unreal series
created by Epic Games (http://www.epicgames.com).


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

=======
2) Bugs
=======

--------------------
A] memory corruption
--------------------

UT3 is affected by a problem in the handling of a specific type of
packet. In this particular type of packet there is a 16 bit field which
specifies the size of the data that follows and if this string is
longer than about 172 bytes a memory corruption will occur allowing an
attacker to control various registers which could allow the execution
of malicious code.


---------------
B] NULL pointer
---------------

If the amount of data about I talked previously is bigger than the
total size of the packet the string will not be read and a NULL pointer
exception will occur.
This type of bug is easily recognizable on the server because the
message "Error: Attempted to multiply free a voice packet" is
displayed before the crash when the malformed packet is received.


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

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


http://aluigi.org/poc/ut3mendo.zip


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

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


No fix


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


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

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/