USN-3247-1: AppArmor vulnerability

28 March 2017

apparmor vulnerability

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

  • Ubuntu 16.10
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS
  • Ubuntu 12.04 LTS

Summary

AppArmor could remove the confinement from some programs.

Software Description

  • apparmor - Linux security system

Details

St├ęphane Graber discovered that AppArmor incorrectly unloaded some profiles when restarted or upgraded, contrary to expected behavior.

Update instructions

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

Ubuntu 16.10
apparmor - 2.10.95-4ubuntu5.3
Ubuntu 16.04 LTS
apparmor - 2.10.95-0ubuntu2.6
Ubuntu 14.04 LTS
apparmor - 2.10.95-0ubuntu2.6~14.04.1
Ubuntu 12.04 LTS
apparmor - 2.7.102-0ubuntu3.11

To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.

After a standard system update you need to reboot your computer to make all the necessary changes.

A new utility, called aa-remove-unknown, was added to assist with profiles that would have been previously unloaded when AppArmor was restarted or upgraded.

References