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