Ubuntu 6537 Published by

The following updates has been released for Ubuntu Linux:

USN-3976-3: Samba regression
USN-3976-4: Samba vulnerability
USN-3994-1: gnome-desktop vulnerability



USN-3976-3: Samba regression


==========================================================================
Ubuntu Security Notice USN-3976-3
May 27, 2019

samba regression
==========================================================================

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

- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

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.

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

Ubuntu 16.04 LTS:
samba 2:4.3.11+dfsg-0ubuntu0.16.04.21

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

References:
https://usn.ubuntu.com/usn/usn-3976-3
https://usn.ubuntu.com/usn/usn-3976-1
https://launchpad.net/bugs/1827924

Package Information:
https://launchpad.net/ubuntu/+source/samba/2:4.7.6+dfsg~ubuntu-0ubuntu2.11
https://launchpad.net/ubuntu/+source/samba/2:4.3.11+dfsg-0ubuntu0.16.04.21

USN-3976-4: Samba vulnerability


==========================================================================
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

USN-3994-1: gnome-desktop vulnerability


==========================================================================
Ubuntu Security Notice USN-3994-1
May 27, 2019

gnome-desktop3 vulnerability
==========================================================================

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

- Ubuntu 19.04
- Ubuntu 18.10
- Ubuntu 18.04 LTS

Summary:

gnome-desktop could be made to escape the thumbnailer sandbox.

Software Description:
- gnome-desktop3: Introspection data for GnomeDesktop

Details:

It was discovered that gnome-desktop incorrectly confined thumbnailers. If
a user were tricked into downloading a malicious image file, a remote
attacker could possibly combine this issue with another vulnerability to
escape the sandbox and execute arbitrary code.

Update instructions:

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

Ubuntu 19.04:
libgnome-desktop-3-17 3.32.1-1ubuntu1.1

Ubuntu 18.10:
libgnome-desktop-3-17 3.30.1-1ubuntu1.1

Ubuntu 18.04 LTS:
libgnome-desktop-3-17 3.28.2-0ubuntu1.3

After a standard system update you need to restart your session to make all
the necessary changes.

References:
https://usn.ubuntu.com/usn/usn-3994-1
CVE-2019-11460

Package Information:
https://launchpad.net/ubuntu/+source/gnome-desktop3/3.32.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/gnome-desktop3/3.30.1-1ubuntu1.1
https://launchpad.net/ubuntu/+source/gnome-desktop3/3.28.2-0ubuntu1.3