CVE-2020-15530

An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to gain NT AUTHORITY\SYSTEM privileges because some parts of %PROGRAMFILES(X86)%\Steam and/or %COMMONPROGRAMFILES(X86)%\Steam have weak permissions during a critical time window. An attacker can make this time window arbitrarily long by using opportunistic locks.

CVSS v3.1

7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v2.0

7.2 HIGHAV:L/AC:L/Au:N/C:C/I:C/A:C

EPSS

0.55% chance of exploitation in the next 30 days, 44th percentile

Published

2020-07-05

Updated

2024-08-04

Proof-of-concept exploits (1)

• http://daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.html

References

• CVE Record
• NVD entry

Related

• CVE-2020-15505
• CVE-2020-15531
• CVE-2020-15500
• CVE-2020-15532
• CVE-2020-15492
• CVE-2020-15535