Your submission was sent successfully! Close

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