=========================================================================Ubuntu Security Notice USN-3353-3
July 24, 2017
heimdal vulnerability
=========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 12.04 ESM
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 versions:
Ubuntu 12.04 ESM:
libkrb5-26-heimdal 1.6~git20120311.dfsg.1-2ubuntu0.2
After a standard system update you need to restart any applications
using Heimdal libraries to make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-3353-3
https://ubuntu.com/security/notices/USN-3353-1
CVE-2017-11103
