Ubuntu 3353-1: Heimdal vulnerability

    Date14 Jul 2017
    CategoryUbuntu
    55
    Posted ByLinuxSecurity Advisories
    Heimdal could allow unintended access to network services.
    ==========================================================================
    Ubuntu Security Notice USN-3353-1
    July 14, 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
    
    Summary:
    
    Heimdal could allow unintended access to network services.
    
    Software Description:
    - heimdal: Heimdal Kerberos Network Authentication Protocol
    
    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 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
    
    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-3353-1
      CVE-2017-11103
    
    Package Information:
      https://launchpad.net/ubuntu/+source/heimdal/7.1.0+dfsg-9ubuntu1.1
      https://launchpad.net/ubuntu/+source/heimdal/1.7~git20150920+dfsg-4ubuntu1.16.10.1
      https://launchpad.net/ubuntu/+source/heimdal/1.7~git20150920+dfsg-4ubuntu1.16.04.1
      https://launchpad.net/ubuntu/+source/heimdal/1.6~git20131207+dfsg-1ubuntu1.2
    
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