CVE-2023-3326

Network authentication attack via pam_krb5

State: Published
Severity: Not scored
Published: Jun 22, 2023
Updated: Dec 5, 2024
Reserved: Jun 19, 2023

Description

pam_krb5 authenticates a user by essentially running kinit with the password, getting a ticket-granting ticket (tgt) from the Kerberos KDC (Key Distribution Center) over the network, as a way to verify the password. However, if a keytab is not provisioned on the system, pam_krb5 has no way to validate the response from the KDC, and essentially trusts the tgt provided over the network as being valid. In a non-default FreeBSD installation that leverages pam_krb5 for authentication and does not have a keytab provisioned, an attacker that is able to control both the password and the KDC responses can return a valid tgt, allowing authentication to occur for any user on the system.

Scores

The record has no CVSS score.

Weaknesses

CWE-303 Incorrect Implementation of Authentication Algorithm

Affected Products

Product	Versions
FreeBSDFreeBSD	13.2-RELEASE to before 13.2-RELEASE-p1Affected 13.1-RELEASE to before 13.1-RELEASE-p8Affected 12.4-RELEASE to before 12.4-RELEASE-p3Affected

References

https://security.freebsd.org/advisories/FreeBSD-SA-23:04.pam_krb5.ascvendor-advisory
https://security.netapp.com/advisory/ntap-20230714-0005/third-party-advisory
https://security.freebsd.org/advisories/FreeBSD-SA-23:09.pam_krb5.ascvendor-advisory

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