From: Luigi Auriemma (aluigiautistici.org)
Date: Thu Sep 09 2004 - 15:05:51 CDT

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                             Luigi Auriemma

Application: Halo: Combat Evolved
              http://www.bungie.net/Games/HaloPC/
Versions: <= 1.4
Platforms: Windows and MacOS
Bug: off-by-one (Denial of Service)
Risk: medium/high
Exploitation: remote, versus server
Date: 09 September 2004
Author: Luigi Auriemma
              e-mail: aluigialtervista.org
              web: http://aluigi.altervista.org

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

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

Halo is the widely known game originally developed by Bungie Studios
and ported on PC by Gearbox Software (http://www.gearboxsoftware.com).
It has been released in September 2003.

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2) Bug
======

Halo uses the Gamespy SDK and moreover the handshake algorithm provided
in this library (http://aluigi.altervista.org/papers/gssdkcr.h) to let
players to join servers.

The off-by-one bug is located just in the client's response (the last
stage of this handshake) because if it is longer than 32 bytes causes
the immediate crash of the server.

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

http://aluigi.altervista.org/poc/haloboom.zip

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

Patch 1.05 for both Win32 and MacOS.

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

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