CVE-2020-15530 Information

Description

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 Vector

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

Reference

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

Attack Complexity

LOW

Privileges Required

LOW

User Interaction Required

LOW

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

HIGH

Availability Impact

HIGH

Base Score

HIGH

Base Severity

7.8