bugtraq - Off-by-one bug in Halo 1.04

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Date: Thu, 9 Sep 2004 20:05:51 +0000
From: Luigi Auriemma <aluigi@...istici.org>
To: bugtraq@...urityfocus.com, bugs@...uritytracker.com, news@...uriteam.com,
   full-disclosure@...ts.netsys.com
Subject: Off-by-one bug in Halo 1.04

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

                             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: aluigi@...ervista.org
              web:    http://aluigi.altervista.org

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

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

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

===============
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.

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

======
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.

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

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

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

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

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

Patch 1.05 for both Win32 and MacOS.

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

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

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