#VU51948 Double Free in FreeBSD


Published: 2022-05-31

Vulnerability identifier: #VU51948

Vulnerability risk: Low

CVSSv3.1: 7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2021-29627

CWE-ID: CWE-415

Exploitation vector: Local

Exploit availability: Yes

Vulnerable software:
FreeBSD
Operating systems & Components / Operating system

Vendor:

Description

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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions


External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-21:09.accept_filter.asc


Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.


Latest bulletins with this vulnerability