QSN-3976-3: samba regression
May 27, 2019
USN-3976-1 introduced a regression in Samba.
USN-3976-1 fixed a vulnerability in Samba. The update introduced a regression causing Samba to occasionally crash. This update fixes the problem.
We apologize for the inconvenience.
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.
A general update will usually fix all issues, but to make sure, you can check your current version with:
If the current version you have is before 2:4.3.11+dfsg-0ubuntu0.16.04.2, run the following:
$ sudo apt-get install samba