Endless loop in Halo 1.07

2008-07-0100:00:00

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                         Luigi Auriemma

Application: Halo: Combat Evolved
http://www.microsoft.com/games/pc/halo.aspx
Versions: <= 1.07
Platforms: Windows
Bug: endless loop
Exploitation: remote, versus server
Date: 29 Jun 2008
Author: Luigi Auriemma
e-mail: [email protected]
web: aluigi.org

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

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1) Introduction

Halo is the great FPS game developed by Bungie Studios and ported on PC
by Gearbox Software (http://www.gearboxsoftware.com).
Although it has been released at the end of 2003, it's still one of the
most played games with hundreds of internet servers.

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2) Bug

This vulnerability is exactly like the old one I found over 3 years ago
in version 1.06 (haloloop) and which was fixed (or it's the case of
saying partially fixed) in version 1.07: an endless loop caused by a
malformed in-game packet which freezes completely the server.

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