Vulnerability identifier: #VU26239

Vulnerability risk: Low

CVSSv3.1: 2.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-7453

CWE-ID: CWE-399

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 gain access to sensitive information.

The vulnerability exists due to a missing NUL-termination check for the jail_set(2) configration option "osrelease" that leads disclosure of additional bytes of kernel memory than was originally set. A local privileges user inside a non-default jail, e.g. setting of children.max > 0 ("nested jails"), can read exposed kernel memory.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 12.1

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External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-20:08.jail.asc

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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.