Epic Games Easy Anti-Cheat 4.0 Local Privilege Escalation

Credit: LiquidWorm
Risk: Medium
Local: Yes
Remote: No
CWE: CWE-264

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: 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

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