Vulnerability identifier: #VU77582

Vulnerability risk: Medium

CVSSv3.1: 6.4 [CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-3326

CWE-ID: CWE-287

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 bypass authentication process.

The vulnerability exists due to an error in pam_krb5 module. A remote attacker with ability to control password and KDC responses can return a valid TGT ticket and bypass authentication process.

Successful exploitation of the vulnerability requires a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

FreeBSD: 12.4 - 13.2

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External links
http://www.freebsd.org/security/advisories/FreeBSD-SA-23:04.pam_krb5.asc
FreeBSD-SA-23:09.pam_krb5.asc

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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