USN-3976-4: Samba vulnerability

27 May 2019

samba vulnerability

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

  • Ubuntu 14.04 ESM


USN-3976-1 introduced a regression in Samba.

Software Description

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


USN-3976-1 fixed a vulnerability in Samba. The update introduced a regression causing Samba to occasionally crash. This update fixes the problem.

Original advisory details:

Isaac Boukris and Andrew Bartlett discovered that Samba incorrectly checked S4U2Self packets. In certain environments, a remote attacker could possibly use this issue to escalate privileges.

Update instructions

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

Ubuntu 14.04 ESM
samba - 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm2

To update your system, please follow these instructions:

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