CVE-2020-15530 Race condition in n/a

High 7.8 Published 5 Jul 2020 Updated 4 Aug 2024

Local attackers can exploit a race condition in the Steam installer to gain SYSTEM privileges by manipulating file permissions during installation.

Exploited in the wild: Not known
Login needed: Any signed-in user
Attackable: Local or same network only
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-15530?

CVE-2020-15530 is a high-severity vulnerability in n/a, published on 5 Jul 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official 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.

Weakness: CWE-362

Which versions are affected by CVE-2020-15530?

It affects 1 product.

Products include Valvesoftware Steam Client.

How do I fix CVE-2020-15530?

No fix has been published for CVE-2020-15530 yet. Limit exposure of the affected software until one is available.

Is CVE-2020-15530 being exploited?

There is no known exploitation of CVE-2020-15530 in the wild and no public exploit code.

Sources

Also known as GHSA-x228-hc8r-8rjq.