USN-3976-3: Samba regression

Releases

• Ubuntu 18.04 ESM
• Ubuntu 16.04 ESM

Packages

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

Details

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.

Update instructions

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

Ubuntu 18.04

• samba - 2:4.7.6+dfsg~ubuntu-0ubuntu2.11

Ubuntu 16.04

• samba - 2:4.3.11+dfsg-0ubuntu0.16.04.21

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

References

• https://launchpad.net/bugs/1827924