Vulnerability identifier: #VU51106

Vulnerability risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-25580

CWE-ID: CWE-264

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
FreeBSD
Operating systems & Components / Operating system

Vendor: FreeBSD Foundation

Description

The vulnerability allows a remote attacker to escalate privileges on the system.

The vulnerability exists due to regression in login.access(5) rule processor, which triggered the rules to be failed in certain cases and deny access rules can be ignored. An attacker can bypass defined access policy and gain unauthorized access to the system, even when the system is configured to deny it.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 11.0 - 13.0

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External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-21:03.pam_login_access.asc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.