Ubuntu 3353-3: Heimdal vulnerability

    Date24 Jul 2017
    Posted ByLinuxSecurity Advisories
    Heimdal could allow unintended access to network services.
    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
    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
    After a standard system update you need to restart any applications
    using Heimdal libraries to make all the necessary changes.
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