Vulnerability in Valvesoftware Steam Client
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.
Vulnerability class: Race Condition
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.005 (43.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000
Affected products
- Valvesoftware Steam Client — versions 2.10.91.91
Weakness classification (CWE)
References
- daniels-it-blog.blogspot.com/2020/07/steam-arbitrary-code-execution-part-2.html (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2020-15530?
- CVE-2020-15530 is a high-severity vulnerability in Valvesoftware Steam Client, classified under Concurrent Execution using Shared Resource with Improper Synchronization (Race Condition). CVSS score: 7.8/10. Published 2020-07-05.
- How severe is CVE-2020-15530?
- High severity. CVSS v3 base score is 7.8 out of 10.