Server freeze in The Rage 1.01

2004-03-2400:00:00

vulners.com

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                         Luigi Auriemma

Application: The Rage
http://www.therageonline.com
Versions: <= 1.01
Platforms: Windows
Bug: server freeze
Risk: low
Exploitation: remote, versus server
Date: 23 Mar 2004
Author: Luigi Auriemma
e-mail: [email protected]
web: http://aluigi.altervista.org

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

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1) Introduction

The Rage is an old school beat'em up game developed by the italians
Fluidgames (http://www.fluidgames.net).

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2) Bug

The packet used by the client to join the match hosted on the server
contains a sockaddr_in structure inside the data that (naturally) is
composed by the AF_INET family, the source port and the IP address of
the client.

This structure is used by the server to send the next packets to the
client but if an attacker fill it with a port and an IP equal to zero
the server will enter in an infinite loop (from offset 0043525b to
0043527f of the decrypted executable) that completely freezes it.

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