VULNERABILITY INTELLIGENCE
CVE-2019-15316
CVSS score7 HIGH
EPSS probability0.45%
CISA KEVNot currently listed
Published2019-08-21
Last modified2026-06-17
CVSS vectorCVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
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.
Weakness classification
- CWE-367: Time-of-check Time-of-use (TOCTOU) Race Condition
- CWE-732: Incorrect Permission Assignment for Critical Resource
Primary references
- cve@mitre.org — Third Party Advisory
- cve@mitre.org — Third Party Advisory
- cve@mitre.org — Exploit, Third Party Advisory
- cve@mitre.org — Exploit, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory
- af854a3a-2127-422b-91ae-364da2661108 — Exploit, Third Party Advisory