CVE-2023-3326

critical

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.

References

https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc

https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc

https://security.netapp.com/advisory/ntap-20230714-0005/

Details

Source: Mitre, NVD

Published: 2023-06-22

CVSS v3

Base Score: 9.8

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Severity: Critical