USN-3353-1: Heimdal vulnerability
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
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 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:
https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to restart any applications
using Heimdal libraries to make all the necessary changes.
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