USN-3353-1: Heimdal vulnerability

Discussion in 'Security' started by Ubuntu Security Notices, Jul 15, 2017.

  1. Ubuntu Security Notice USN-3353-1

    14th July, 2017

    heimdal vulnerability

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

    • Ubuntu 17.04
    • Ubuntu 16.10
    • Ubuntu 16.04 LTS
    • Ubuntu 14.04 LTS

    Heimdal could allow unintended access to network services.

    Software description

    • heimdal - Heimdal Kerberos Network Authentication Protocol

    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 17.04:
    libkrb5-26-heimdal 7.1.0+dfsg-9ubuntu1.1
    Ubuntu 16.10:
    libkrb5-26-heimdal 1.7~git20150920+dfsg-4ubuntu1.16.10.1
    Ubuntu 16.04 LTS:
    libkrb5-26-heimdal 1.7~git20150920+dfsg-4ubuntu1.16.04.1
    Ubuntu 14.04 LTS:
    libkrb5-26-heimdal 1.6~git20131207+dfsg-1ubuntu1.2

    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.



    Continue reading...

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