Nexon Games Privilege Escalation
Posted on 17 May 2016
----------------------------------------------------------------------------------------------------------------- # Exploit Title: Multiples Nexon Games - Privilege Escalation Unquoted path vulnerabilities # Date: 13/05/2016 # Exploit Author : Cyril Vallicari # Vendor Homepage: http://www.nexon.net/ # Softwares Links: http://dirtybomb.nexon.net/ (DirtyBomb) # http://store.steampowered.com/app/273110/ (CSNZ) # Versions: Dirty Bomb r56825 USA_EU / CSNZ : 0.0.18845.1 # Tested on: Windows 7 x64 SP1 (but it should works on all windows version) Description : Multiples Nexon Game, including but not limited to Dirty Bomb and Counter-Strike Nexon : Zombies, are Prone to unquoted path vulnerability. They fail to quote correctly the command that call for BlackXcht.aes, which is a part of the anti-cheat system (Nexon Game Security). Probably all Nexon games calling this file are affected. This could potentially allow an authorized but non-privileged local user to execute arbitrary code with elevated privileges on the system. POC : Put a software named Program.exe in C: Launch the game via steam When BlackXcht.aes is called, Program.exe is executed with same rights as steam POC video : https://www.youtube.com/watch?v=wcn62GGwtcQ Patch : Patch for Dirty bomb - Upgrade to r57457 USA_EU
