Ubuntu 3717-2: PolicyKit vulnerabilities

    Date17 Jul 2018
    Posted ByAnthony Pell
    Several security issues were fixed in PolicyKit.
    Ubuntu Security Notice USN-3717-2
    July 17, 2018
    policykit-1 vulnerabilities
    A security issue affects these releases of Ubuntu and its derivatives:
    - Ubuntu 12.04 ESM
    Several security issues were fixed in PolicyKit.
    Software Description:
    - policykit-1: framework for managing administrative policies and
    USN-3717-1 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 handled certain duplicate
     action IDs. A local attacker could use this issue to cause PolicyKit
     to crash, resulting in a denial of service, or possibly escalate
     privileges. (CVE-2015-3255)
     Matthias Gerstner discovered that PolicyKit incorrectly checked users.
     A local attacker could possibly use this issue to cause authentication
     dialogs to show up for other users, leading to a denial of service or
     an information leak. (CVE-2018-1116)
    Update instructions:
    The problem can be corrected by updating your system to the following
    package versions:
    Ubuntu 12.04 ESM:
      libpolkit-backend-1-0           0.104-1ubuntu1.2
    After a standard system update you need to reboot your computer to make
    all the necessary changes.
      CVE-2015-3255, CVE-2018-1116
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