Several security issues were fixed in PolicyKit.
USN-3717-1 fixed a vulnerability in PolicyKit. This update provides the corresponding update for Ubuntu 12.04 ESM.
17 July 2018
A security issue affects these releases of Ubuntu and its derivatives:
Several security issues were fixed in PolicyKit.
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)
The problem can be corrected by updating your system to the following package versions:
To update your system, please follow these instructions: https://wiki.ubuntu.com/Security/Upgrades.
After a standard system update you need to reboot your computer to make all the necessary changes.