Ubuntu 3784-1: AppArmor update

    Date04 Oct 2018
    CategoryUbuntu
    3052
    Posted ByAnthony Pell
    Use a more restrictive blacklist in several policy abstractions.
    ==========================================================================
    Ubuntu Security Notice USN-3784-1
    October 04, 2018
    
    AppArmor update
    ==========================================================================
    
    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
    
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