ESB-2018.3013 - [Linux][Ubuntu] AppArmor: Modify arbitrary files - Unknown/unspecified 2018-10-05

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.3013
                              AppArmor update
                              5 October 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           AppArmor
Publisher:         Ubuntu
Operating System:  Ubuntu
                   Linux variants
Impact/Access:     Modify Arbitrary Files -- Unknown/Unspecified
Resolution:        Patch/Upgrade

Original Bulletin: 
   http://www.ubuntu.com/usn/usn-3784-1

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Ubuntu. It is recommended that administrators 
         running AppArmor check for an updated version of the software for 
         their operating system.

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USN-3784-1: AppArmor update

4 October 2018

AppArmor update

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

  o Ubuntu 18.04 LTS
  o Ubuntu 16.04 LTS
  o Ubuntu 14.04 LTS

Summary

Use a more restrictive blacklist in several policy abstractions.

Software Description

  o 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

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

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

References

  o LP: 1788929
  o LP: 1794848

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