Double Free in FreeBSD - CVE-2021-29627
Published: April 7, 2021 / Updated: May 31, 2022
Vulnerability identifier: #VU51948
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-2021-29627
CWE-ID: CWE-415
Exploitation vector: Local access
Exploit availability:
Public exploit is available
Vulnerability details
The vulnerability allows a local user to gain elevated privileges on the system.
The vulnerability exists due to a boundary error in accept_filter(9) socket configuration interface. A local user can pass specially crafted data to the application, trigger double free error and escalate privileges on the system.
Affected software
FreeBSD
How to mitigate CVE-2021-29627
Install updates from vendor's website.
FreeBSD - addressed in versions 12.2, 12.2-RELEASE-p6, 13.0 RC4, 13.0