Ubuntu 3934-2: PolicyKit vulnerability

    Date02 Sep 2019
    CategoryUbuntu
    1038
    Posted ByLinuxSecurity Advisories
    PolicyKit could allow unintended access.
    ==========================================================================
    Ubuntu Security Notice USN-3934-2
    September 02, 2019
    
    policykit-1 vulnerability
    ==========================================================================
    
    A security issue affects these releases of Ubuntu and its derivatives:
    
    - Ubuntu 12.04 ESM
    
    Summary:
    
    PolicyKit could allow unintended access.
    
    Software Description:
    - policykit-1: framework for managing administrative policies and privileges
    
    Details:
    
    USN-3934-1 fixed a vulnerability in Policykit. This update provides
    the corresponding update for Ubuntu 12.04 ESM.
    
    Original advisory details:
    
     It was discovered that PolicyKit incorrectly relied on the fork() system
     call in the Linux kernel being atomic. A local attacker could possibly use
     this issue to gain access to services that have cached authorizations.
    
    Update instructions:
    
    The problem can be corrected by updating your system to the following
    package versions:
    
    Ubuntu 12.04 ESM:
      libpolkit-backend-1-0           0.104-1ubuntu1.5
      policykit-1                     0.104-1ubuntu1.5
    
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
    
    References:
      https://usn.ubuntu.com/3934-2
      https://usn.ubuntu.com/3934-1
      CVE-2019-6133
    
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