[USN-7257-1] Kerberos vulnerability

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==========================================================================
Ubuntu Security Notice USN-7257-1
February 05, 2025

krb5 vulnerability
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 24.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS

Summary:

A system authentication measure could be bypassed.

Software Description:
- krb5: MIT Kerberos Network Authentication Protocol

Details:

Goldberg, Miro Haller, Nadia Heninger, Mike Milano, Dan Shumow, Marc
Stevens, and Adam Suhl discovered that Kerberos incorrectly authenticated
certain responses. An attacker able to intercept communications between a
RADIUS client and server could possibly use this issue to forge responses,
bypass authentication, and access network devices and services.

This update introduces support for the Message-Authenticator attribute in
non-EAP authentication methods for communications between Kerberos and a
RADIUS server.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 24.10
libk5crypto3 1.21.3-3ubuntu0.1
libkrad0 1.21.3-3ubuntu0.1

Ubuntu 24.04 LTS
libk5crypto3 1.20.1-6ubuntu2.3
libkrad0 1.20.1-6ubuntu2.3

Ubuntu 22.04 LTS
libk5crypto3 1.19.2-2ubuntu0.5
libkrad0 1.19.2-2ubuntu0.5

Ubuntu 20.04 LTS
libk5crypto3 1.17-6ubuntu4.8
libkrad0 1.17-6ubuntu4.8

Ubuntu 18.04 LTS
libk5crypto3 1.16-2ubuntu0.4+esm3
Available with Ubuntu Pro
libkrad0 1.16-2ubuntu0.4+esm3
Available with Ubuntu Pro

Ubuntu 16.04 LTS
libk5crypto3 1.13.2+dfsg-5ubuntu2.2+esm6
Available with Ubuntu Pro
libkrad0 1.13.2+dfsg-5ubuntu2.2+esm6
Available with Ubuntu Pro

Ubuntu 14.04 LTS
libk5crypto3 1.12+dfsg-2ubuntu5.4+esm6
Available with Ubuntu Pro
libkrad0 1.12+dfsg-2ubuntu5.4+esm6
Available with Ubuntu Pro

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7257-1
CVE-2024-3596

Package Information:
https://launchpad.net/ubuntu/+source/krb5/1.21.3-3ubuntu0.1
https://launchpad.net/ubuntu/+source/krb5/1.20.1-6ubuntu2.3
https://launchpad.net/ubuntu/+source/krb5/1.19.2-2ubuntu0.5
https://launchpad.net/ubuntu/+source/krb5/1.17-6ubuntu4.8