CVE-2019-15316
UnknownEPSS 0.39%
Last modified
CVE-2019-15316 is a vulnerability of currently unknown severity. 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.. EPSS estimates a 0.39% chance of exploitation in the next 30 days.
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.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Valvesoftware | Steam Client | <= 2019-08-20 |
References
- https://amonitoring.ru/article/onemore_steam_eop_0day/Third Party Advisory
- https://habr.com/ru/company/pm/blog/464367/Third Party Advisory
- https://www.youtube.com/watch?v=I93aH86BUaEExploit, Third Party Advisory
- https://www.youtube.com/watch?v=ZCHrjP0cMewExploit, Third Party Advisory
- https://amonitoring.ru/article/onemore_steam_eop_0day/Third Party Advisory
- https://habr.com/ru/company/pm/blog/464367/Third Party Advisory
- https://www.youtube.com/watch?v=I93aH86BUaEExploit, Third Party Advisory
- https://www.youtube.com/watch?v=ZCHrjP0cMewExploit, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-15316?
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.
How severe is CVE-2019-15316?
Severity scoring for CVE-2019-15316 is pending analysis. The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.
How do I fix CVE-2019-15316?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2019-15316?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST