Buffer-overflow in the Asura engine

2007-08-2300:00:00

vulners.com

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                         Luigi Auriemma

Application: Asura engine (network SDK)
http://www.rebellion.co.uk
Games: Rogue Trooper <= 1.0
Prism: Guard Shield <= 1.1.1.0
…possibly others…
Platforms: Windows
Bug: challenge buffer-overflow
Exploitation: remote, versus server (in-game)
Date: 22 Aug 2007
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

Asura is a game engine written by Rebellion and used in their games.
Rogue Trooper and Prism are the only two games (as far as I know) which
use the new network protocol which leads to the vulnerability reported
in this advisory, the older games were based on DirectPlay (Judge
Dredd) and Gamespy SDK (Sniper Elite).

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2) Bug

A buffer-overflow vulnerability is located in the function which
handles the 0xf007 packet used for the challenge B query.
In this function the data passed by the client is copied (without
checks on its length) to a stack buffer of 256 bytes used for sending
the data back to the client, something similar to a ping.

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