=========================================================================Ubuntu Security Notice USN-3353-4
July 24, 2017

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

- Ubuntu 12.04 ESM

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.

Original advisory details:

 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 services or perform other attacks.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 12.04 ESM:
  libsmbclient                    2:3.6.25-0ubuntu0.12.04.12

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

References:
  
  https://ubuntu.com/security/notices/USN-3353-1
  CVE-2017-11103