=========================================================================Ubuntu Security Notice USN-3353-2
July 14, 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

Summary:

Samba could allow unintended access to network services.

Software Description:
- samba: SMB/CIFS file, print, and login server for Unix

Details:

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:
  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

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

References:
  
  
  CVE-2017-11103

Package Information:
  https://launchpad.net/ubuntu/+source/samba/2:4.5.8+dfsg-0ubuntu0.17.04.4
  https://launchpad.net/ubuntu/+source/samba/2:4.4.5+dfsg-2ubuntu5.8
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.9
  https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.14.04.10