Ubuntu Security Notice USN-3717-2
July 17, 2018
A security issue affects these releases of Ubuntu and its derivatives:
– Ubuntu 12.04 ESM
Several security issues were fixed in PolicyKit.
– 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
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
Ubuntu 12.04 ESM:
After a standard system update you need to reboot your computer to make
all the necessary changes.