Time-of-check Time-of-use (TOCTOU) Race Condition in macOS - CVE-2020-9839
Published: May 28, 2020 / Updated: October 9, 2021
Vulnerability identifier: #VU28314
CSH Severity: Low
CVSS v4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-9839
CWE-ID:
Exploitation vector: Local access
Exploit availability:
The vulnerability is being exploited in the wild
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to a lack of proper locking when performing operations on an object within the handling of file permissions. An local user can gain elevated privileges on the target system.
Affected software
macOS
How to mitigate CVE-2020-9839
Install updates from vendor's website.
macOS - update to 10.15.5 19F96