[USN-3934-1] PolicyKit vulnerability

Marc Deslauriers marc.deslauriers at canonical.com
Wed Apr 3 13:04:50 UTC 2019

Ubuntu Security Notice USN-3934-1
April 03, 2019

policykit-1 vulnerability

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 LTS


PolicyKit could allow unintended access.

Software Description:
- policykit-1: framework for managing administrative policies and privileges


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 18.10:
  libpolkit-backend-1-0           0.105-21ubuntu0.4
  policykit-1                     0.105-21ubuntu0.4

Ubuntu 18.04 LTS:
  libpolkit-backend-1-0           0.105-20ubuntu0.18.04.5
  policykit-1                     0.105-20ubuntu0.18.04.5

Ubuntu 16.04 LTS:
  libpolkit-backend-1-0           0.105-14.1ubuntu0.5
  policykit-1                     0.105-14.1ubuntu0.5

Ubuntu 14.04 LTS:
  libpolkit-backend-1-0           0.105-4ubuntu3.14.04.6
  policykit-1                     0.105-4ubuntu3.14.04.6

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


Package Information:

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