CVE-2023-3326

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.

• CWE-303
• CWE-287

• https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.ascMitigation, Vendor Advisory
• https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc
• https://security.netapp.com/advisory/ntap-20230714-0005/Third Party Advisory
• https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.ascMitigation, Vendor Advisory
• https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc
• https://security.netapp.com/advisory/ntap-20230714-0005/Third Party Advisory

Published

Jun 22, 2023

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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