Epic Games Easy Anti-Cheat 4.0 Local Privilege Escalation

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Epic Games Easy Anti-Cheat 4.0 Local Privilege Escalation  
  
  
Vendor: Epic Games, Inc.  
Product web page: https://www.epicgames.com  
https://www.easy.ac  
Affected version: 4.0.0.0  
  
Summary: Easy Anti-Cheat is the industry-leading anti–cheat service,  
countering hacking and cheating in multiplayer PC games through the  
use of hybrid anti–cheat mechanisms.  
  
Desc: The application suffers from an unquoted search path issue impacting  
the service 'EasyAntiCheat' for Windows deployed as part of Easy Anti-Cheat  
Service application. This could potentially allow an authorized but non-privileged  
local user to execute arbitrary code with elevated privileges on the system.  
A successful attempt would require the local user to be able to insert their  
code in the system root path undetected by the OS or other security applications  
where it could potentially be executed during application startup or reboot.  
If successful, the local user's code would execute with the elevated privileges  
of the application.  
  
Tested on: Microsoft Windows 10  
  
  
Vulnerability discovered by Gjoko 'LiquidWorm' Krstic  
@zeroscience  
  
  
Advisory ID: ZSL-2021-5652  
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2021-5652.php  
  
  
04.05.2021  
  
--  
  
  
C:\Users>sc qc EasyAntiCheat  
[SC] QueryServiceConfig SUCCESS  
  
SERVICE_NAME: EasyAntiCheat  
TYPE : 10 WIN32_OWN_PROCESS  
START_TYPE : 3 DEMAND_START  
ERROR_CONTROL : 1 NORMAL  
BINARY_PATH_NAME : C:\Program Files (x86)\EasyAntiCheat\EasyAntiCheat.exe  
LOAD_ORDER_GROUP :  
TAG : 0  
DISPLAY_NAME : EasyAntiCheat  
DEPENDENCIES :  
SERVICE_START_NAME : LocalSystem  
`