USN-3353-3: Heimdal vulnerability

24 July 2017

heimdal vulnerability

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

  • Ubuntu 12.04 ESM


Heimdal could allow unintended access to network services.

Software Description

  • heimdal - Heimdal Kerberos Network Authentication Protocol


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 versions:

Ubuntu 12.04 ESM
libkrb5-26-heimdal - 1.6~git20120311.dfsg.1-2ubuntu0.2

To update your system, please follow these instructions:

After a standard system update you need to restart any applications using Heimdal libraries to make all the necessary changes.