USN-3353-3: Heimdal vulnerability

Ubuntu Security Notice USN-3353-3

24th July, 2017

heimdal vulnerability

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

• Ubuntu 12.04 LTS

Summary

Heimdal could allow unintended access to network services.

Software description

• heimdal
  - Heimdal Kerberos Network Authentication Protocol
  
  

Details

USN-3353-1 fixed a vulnerability in Heimdal. This update provides
the corresponding updade for Ubuntu 12.04 ESM.

Original advisory 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 12.04 LTS:

To update your system, please follow these instructions: