Vulnerability CVE-2019-15316
Published: 2019-08-21

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.

Type:

CWE-264

 (Permissions, Privileges, and Access Controls)

CVSS2 => (AV:L/AC:M/Au:N/C:C/I:C/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.9/10
10/10
3.4/10
Exploit range
Attack complexity
Authentication
Local
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Complete
Complete
Complete
Affected software
Valvesoftware -> Steam client 

 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
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