CVE-2023-3326 Network authentication attack via pam_krb5
Attackers can bypass authentication in FreeBSD using pam_krb5 without a keytab by controlling KDC responses, allowing unauthorized access to any user account.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-3326?
CVE-2023-3326 is a critical authentication bypass vulnerability in Freebsd Freebsd, published on 22 Jun 2023. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Which versions are affected by CVE-2023-3326?
It affects 1 product.
Products include Freebsd Freebsd.
How do I fix CVE-2023-3326?
No fix has been published for CVE-2023-3326 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2023-3326 being exploited?
There is no known exploitation of CVE-2023-3326 in the wild and no public exploit code.
Other vulnerabilities in Freebsd Freebsd
Sources
Also known as DEBIAN-CVE-2023-3326, GHSA-vjhp-527w-c5vj, UBUNTU-CVE-2023-3326.