Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| FreeBSD / FreeBSD | affected 13.2-RELEASE before 13.2-RELEASE-p1; affected 13.1-RELEASE before 13.1-RELEASE-p8; affected 12.4-RELEASE before 12.4-RELEASE-p3 |
CWE
CWE-303
References
- https://security.FreeBSD.org/advisories/FreeBSD-SA-23:04.pam_krb5.asc
- https://security.netapp.com/advisory/ntap-20230714-0005/
- https://security.FreeBSD.org/advisories/FreeBSD-SA-23:09.pam_krb5.asc
ADP enrichment
No English description supplied.
No English description supplied.
No references supplied.