cve/2020/CVE-2020-15530.md

### [CVE-2020-15530](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-15530)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### 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.

### POC

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

#### Github
No PoCs found on GitHub currently.