USN-3353-1: Heimdal vulnerability

Ubuntu Security Notice USN-3353-1

14th July, 2017

heimdal vulnerability

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

• Ubuntu 17.04



• Ubuntu 16.10



• Ubuntu 16.04 LTS



• Ubuntu 14.04 LTS

Summary

Heimdal could allow unintended access to network services.

Software description

• heimdal
  - Heimdal Kerberos Network Authentication Protocol
  
  

Details

Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams discovered
that Heimdal clients incorrectly trusted unauthenticated portions
of Kerberos tickets. A remote attacker could use this to impersonate
trusted network services or perform other attacks.

Update instructions

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

Ubuntu 17.04:

Ubuntu 16.10:

Ubuntu 16.04 LTS:

Ubuntu 14.04 LTS:

To update your system, please follow these instructions: