Privilege Escalation Vulnerability in Valve Steam Client for Windows

CVE-2019-15316 · MEDIUM Severity

AV:L/AC:M/AU:N/C:C/I:C/A:C

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.

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