CVE-2023-3326
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.10%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 1.10% probability · 64th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-303, CWE-287
- Affected
- freebsd/freebsd
- Source
- secteam@freebsd.org
References
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.