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USN-3353-1: Heimdal vulnerability

14 July 2017

Heimdal could allow unintended access to network services.

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Releases

Packages

  • 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.

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.

Learn more about Ubuntu Pro

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.

References

Related notices

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