USN-3717-1: PolicyKit vulnerabilities

16 July 2018

Several security issues were fixed in PolicyKit.

Releases

Packages

  • policykit-1 - framework for managing administrative policies and privileges

Details

Tavis Ormandy discovered that PolicyKit incorrectly handled certain invalid
object paths. A local attacker could possibly use this issue to cause
PolicyKit to crash, resulting in a denial of service. This issue only
affected Ubuntu 14.04 LTS. (CVE-2015-3218)

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.
This issue only affected Ubuntu 14.04 LTS. (CVE-2015-3255)

Tavis Ormandy discovered that PolicyKit incorrectly handled duplicate
cookie values. A local attacker could use this issue to cause PolicyKit to
crash, resulting in a denial of service, or possibly escalate privileges.
This issue only affected Ubuntu 14.04 LTS. (CVE-2015-4625)

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 18.04
Ubuntu 17.10
Ubuntu 16.04
Ubuntu 14.04

After a standard system update you need to reboot your computer to make
all the necessary changes.

Related notices