Advisory Published

USN-7257-1: Kerberos vulnerability

First published: Wed Feb 05 2025(Updated: )

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.

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/libk5crypto3<1.21.3-3ubuntu0.1
1.21.3-3ubuntu0.1
Ubuntu Linux=24.10
All of
ubuntu/libkrad0<1.21.3-3ubuntu0.1
1.21.3-3ubuntu0.1
Ubuntu Linux=24.10
All of
ubuntu/libk5crypto3<1.20.1-6ubuntu2.3
1.20.1-6ubuntu2.3
Ubuntu Linux=24.04
All of
ubuntu/libkrad0<1.20.1-6ubuntu2.3
1.20.1-6ubuntu2.3
Ubuntu Linux=24.04
All of
ubuntu/libk5crypto3<1.19.2-2ubuntu0.5
1.19.2-2ubuntu0.5
Ubuntu Linux=22.04
All of
ubuntu/libkrad0<1.19.2-2ubuntu0.5
1.19.2-2ubuntu0.5
Ubuntu Linux=22.04
All of
ubuntu/libk5crypto3<1.17-6ubuntu4.8
1.17-6ubuntu4.8
Ubuntu Linux=20.04
All of
ubuntu/libkrad0<1.17-6ubuntu4.8
1.17-6ubuntu4.8
Ubuntu Linux=20.04
All of
ubuntu/libk5crypto3<1.16-2ubuntu0.4+esm3
1.16-2ubuntu0.4+esm3
Ubuntu Linux=18.04
All of
ubuntu/libkrad0<1.16-2ubuntu0.4+esm3
1.16-2ubuntu0.4+esm3
Ubuntu Linux=18.04
All of
ubuntu/libk5crypto3<1.13.2+dfsg-5ubuntu2.2+esm6
1.13.2+dfsg-5ubuntu2.2+esm6
Ubuntu Linux=16.04
All of
ubuntu/libkrad0<1.13.2+dfsg-5ubuntu2.2+esm6
1.13.2+dfsg-5ubuntu2.2+esm6
Ubuntu Linux=16.04
All of
ubuntu/libk5crypto3<1.12+dfsg-2ubuntu5.4+esm6
1.12+dfsg-2ubuntu5.4+esm6
Ubuntu Linux=14.04
All of
ubuntu/libkrad0<1.12+dfsg-2ubuntu5.4+esm6
1.12+dfsg-2ubuntu5.4+esm6
Ubuntu Linux=14.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-7257-1?

    The USN-7257-1 vulnerability is considered high risk due to the potential for attackers to forge authentication responses.

  • How do I fix USN-7257-1?

    To resolve USN-7257-1, update the affected packages to the recommended versions specific to your Ubuntu distribution.

  • What software is affected by USN-7257-1?

    USN-7257-1 affects multiple versions of libk5crypto3 and libkrad0 on various Ubuntu releases.

  • What does USN-7257-1 exploit?

    USN-7257-1 exploits a flaw in Kerberos that allows interception and forgery of authentication responses between RADIUS clients and servers.

  • How can I verify if I'm impacted by USN-7257-1?

    You can check your installed versions of libk5crypto3 and libkrad0 against the versions listed in the USN-7257-1 advisory to determine if you are affected.

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