USN-3784-1: AppArmor update

04 October 2018

Use a more restrictive blacklist in several policy abstractions.

Releases

Packages

  • apparmor - Linux security system

Details

As a security improvement, this update adjusts the private-files abstraction to
disallow writing to thumbnailer configuration files. Additionally adjust the
private-files, private-files-strict and user-files abstractions to disallow
writes on parent directories of sensitive files.

Update instructions

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

Ubuntu 18.04
Ubuntu 16.04
Ubuntu 14.04

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