Time-of-check Time-of-use (TOCTOU) Race Condition in Parallels Desktop - CVE-2021-34986
Published: February 21, 2022
Vulnerability identifier: #VU60723
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-2021-34986
CWE-ID: CWE-367
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a local user to escalate privileges on the system.
The vulnerability exists due to Time-of-check Time-of-use condition within the Parallels Service. A local user can create a symbolic link, abuse the service to execute a file and gain elevated privileges on the system.
Affected software
Parallels Desktop
How to mitigate CVE-2021-34986
Install updates from vendor's website.
Parallels Desktop - update to 17.1.0 51516