#VU61907 Time-of-check Time-of-use (TOCTOU) Race Condition in FreeBSD


Published: 2022-04-06 | Updated: 2022-09-21

Vulnerability identifier: #VU61907

Vulnerability risk: Low

CVSSv3.1: 6.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2022-23084

CWE-ID: CWE-367

Exploitation vector: Local

Exploit availability: No

Vulnerable software:
FreeBSD
Operating systems & Components / Operating system

Vendor: FreeBSD Foundation

Description

The vulnerability allows a local user to bypass implemented security restrictions.

The vulnerability exists due to a race condition in netmap. The total size of the user-provided nmreq to nmreq_copyin() function was first computed and then trusted during the copyin operation. A local user can trigger a race condition, which can lead to memory corruption and code execution. The vulnerability can be used to escape jail environment.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 12.0 - 13.1


External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-22:04.netmap.asc
http://www.zerodayinitiative.com/advisories/ZDI-22-1291/


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.


Latest bulletins with this vulnerability