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CVE-2023-3326

Date: June 22, 2023

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.

Language: C

Severity Score

Related Resources (9)

https://nvd.nist.gov/vuln/detail/CVE-2023-3326
https://security.netapp.com/advisory/ntap-20230714-0005/
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://people.canonical.com/~ubuntu-security/cve/CVE-2023-3326
https://security-tracker.debian.org/tracker/CVE-2023-3326
https://github.com/NetBSD/src/commit/7d9a085c9de2fb26f7660369a74e423a0f136d0c
https://seclists.org/oss-sec/2023/q2/254
https://www.mend.io/vulnerability-database/CVE-2023-3326

Severity Score

Weakness Type (CWE)

Authentication Issues

CWE-287

CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): HIGH

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