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USN-3353-2: Samba vulnerability

14 July 2017

Samba could allow unintended access to network services.



  • samba - SMB/CIFS file, print, and login server for Unix


USN-3353-1 fixed a vulnerability in Heimdal. This update provides
the corresponding update for Samba.

Jeffrey Altman, Viktor Dukhovni, and Nicolas Williams discovered
that Samba clients incorrectly trusted unauthenticated portions of
Kerberos tickets. A remote attacker could use this to impersonate
trusted network servers 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

In general, a standard system update will make all the necessary changes.


Related notices

  • USN-3353-4: libsmbclient, samba
  • USN-3353-1: libhx509-5-heimdal, libotp0-heimdal, libkdc2-heimdal, libhcrypto4-heimdal, libkadm5clnt7-heimdal, heimdal-multidev, libheimbase1-heimdal, libhdb9-heimdal, libkrb5-26-heimdal, heimdal-clients-x, libasn1-8-heimdal, heimdal-docs, heimdal-dev, heimdal-clients, heimdal-kcm, heimdal-servers-x, heimdal-servers, libheimntlm0-heimdal, libroken18-heimdal, libgssapi3-heimdal, libsl0-heimdal, heimdal, libkadm5srv8-heimdal, libkafs0-heimdal, libwind0-heimdal, heimdal-kdc
  • USN-3353-3: libkrb5-26-heimdal, heimdal