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Ubuntu Security Notice USN-3976-4

Ubuntu Security Notice USN-3976-4
Posted May 27, 2019
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 3976-4 - USN-3976-1 fixed a vulnerability in Samba. The update introduced a regression causing Samba to occasionally crash. This update fixes the problem. 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. Various other issues were also addressed.

tags | advisory, remote
systems | linux, ubuntu
MD5 | a82dde377af2be31c0123977d753f099

Ubuntu Security Notice USN-3976-4

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-3976-4
May 27, 2019

samba vulnerability
==========================================================================

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

- Ubuntu 14.04 ESM

Summary:

USN-3976-1 introduced a regression in Samba.

Software Description:
- 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.

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

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

References:
https://usn.ubuntu.com/usn/usn-3976-4
https://usn.ubuntu.com/usn/usn-3976-1
https://launchpad.net/bugs/1827924

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