N/A - USN-3784-1

Executive Summary

Summary
Title	AppArmor update

Informations
Name	USN-3784-1	First vendor Publication	2018-10-04
Vendor	Ubuntu	Last vendor Modification	2018-10-04
Severity (Vendor)	N/A	Revision	N/A

Security-Database Scoring CVSS v3

Cvss vector : N/A
Overall CVSS Score	NA
Base Score	NA	Environmental Score	NA
impact SubScore	NA	Temporal Score	NA
Exploitabality Sub Score	NA

Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector :
Cvss Base Score	N/A	Attack Range	N/A
Cvss Impact Score	N/A	Attack Complexity	N/A
Cvss Expoit Score	N/A	Authentication	N/A
Calculate full CVSS 2.0 Vectors scores

Detail

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

- Ubuntu 18.04 LTS - Ubuntu 16.04 LTS - Ubuntu 14.04 LTS

Summary:

Use a more restrictive blacklist in several policy abstractions.

Software Description: - 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 LTS:
apparmor 2.12-4ubuntu5.1

Ubuntu 16.04 LTS:
apparmor 2.10.95-0ubuntu2.10

Ubuntu 14.04 LTS:
apparmor 2.10.95-0ubuntu2.6~14.04.4

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

References:
https://usn.ubuntu.com/usn/usn-3784-1
https://launchpad.net/bugs/1788929, https://launchpad.net/bugs/1794848

Package Information:
https://launchpad.net/ubuntu/+source/apparmor/2.12-4ubuntu5.1
https://launchpad.net/ubuntu/+source/apparmor/2.10.95-0ubuntu2.10
https://launchpad.net/ubuntu/+source/apparmor/2.10.95-0ubuntu2.6~14.04.4