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USN-3353-1: Heimdal vulnerability

14 July 2017

Heimdal could allow unintended access to network services.



  • 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 versions:

Ubuntu 17.04
Ubuntu 16.10
Ubuntu 16.04
Ubuntu 14.04

After a standard system update you need to restart any applications
using Heimdal libraries to make all the necessary changes.


Related notices

  • USN-3353-4: samba, libsmbclient
  • USN-3353-3: libkrb5-26-heimdal, heimdal
  • USN-3353-2: samba-dsdb-modules, registry-tools, libparse-pidl-perl, samba-vfs-modules, libsmbsharemodes-dev, libnss-winbind, samba, samba-testsuite, libsmbsharemodes0, libwbclient0, samba-common-bin, winbind, libsmbclient-dev, libwbclient-dev, libsmbclient, ctdb, python-samba, samba-dev, samba-doc, libpam-smbpass, samba-common, smbclient, libpam-winbind, samba-libs