USN-3976-1: Samba vulnerability

14 May 2019

samba vulnerability

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

  • Ubuntu 19.04
  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS


Samba could allow unintended access to network services.

Software Description

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


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 19.04
samba - 2:4.10.0+dfsg-0ubuntu2.1
Ubuntu 18.10
samba - 2:4.8.4+dfsg-2ubuntu2.4
Ubuntu 18.04 LTS
samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.10
Ubuntu 16.04 LTS
samba - 2:4.3.11+dfsg-0ubuntu0.16.04.20

To update your system, please follow these instructions:

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