CVE-2023-3326

Einstufung nach Quelle

Trivys eigenes Label ist CRITICAL. Kritisch laut NVD. Niedriger laut Ubuntu (niedrig).

Beschreibung

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.

Betroffene Pakete und behobene Versionen

Referenzen

• https://seclists.org/oss-sec/2023/q2/245
• 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/
• https://www.cve.org/CVERecord?id=CVE-2023-3326