==========================================================================
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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