Unscored CVE-2019-15316 EUVD-2019-6317GHSA-x7v3-vhf3-7wrh

Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via…

Published Aug 21, 2019 · Updated Aug 5, 2024 · Assigned by mitre

Description

Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT AUTHORITY\SYSTEM) via crafted use of CreateMountPoint.exe and SetOpLock.exe to leverage a TOCTOU race condition.

References

https://amonitoring.ru/article/onemore_steam_eop_0day/
https://habr.com/ru/company/pm/blog/464367/
https://www.youtube.com/watch?v=I93aH86BUaE
https://www.youtube.com/watch?v=ZCHrjP0cMew