========================================================================== 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://www.ubuntu.com/usn/usn-3353-3 https://www.ubuntu.com/usn/usn-3353-1 CVE-2017-11103
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