####################################################################### 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_at_autistici&#46;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