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USN-3976-4: Samba vulnerability

27 May 2019

USN-3976-1 introduced a regression in Samba.



  • 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

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

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