Critical AppArmor Issue in Ubuntu 16.04 LTS: USN-3247-1 Advisory

ubuntu

March 28, 2017

AppArmor could remove the confinement from some programs.

Summary

AppArmor could remove the confinement from some programs.

Software Description:

- apparmor: Linux security system

Details:

Stéphane Graber discovered that AppArmor incorrectly unloaded some profiles

when restarted or upgraded, contrary to expected behavior.

Topics Covered

security advisory critical software update security patch ubuntu apparmor confinement issue

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

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.