USN-3353-2: Samba vulnerability

Ubuntu Security Notice USN-3353-2

14th July, 2017

samba vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

  • Ubuntu 17.04
  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Samba could allow unintended access to network services.

Software description

  • 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 version:

Ubuntu 17.04:
samba-libs 2:4.5.8+dfsg-0ubuntu0.17.04.4
Ubuntu 16.10:
samba-libs 2:4.4.5+dfsg-2ubuntu5.8
Ubuntu 16.04 LTS:
samba-libs 2:4.3.11+dfsg-0ubuntu0.16.04.9
Ubuntu 14.04 LTS:
samba-libs 2:4.3.11+dfsg-0ubuntu0.14.04.10

To update your system, please follow these instructions:

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