[USN-3934-2] PolicyKit vulnerability

[Leonidas S. Barbosa]

==========================================================================
Ubuntu Security Notice USN-3934-2
September 02, 2019

policykit-1 vulnerability
==========================================================================

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

- Ubuntu 12.04 ESM

Summary:

PolicyKit could allow unintended access.

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

Details:

USN-3934-1 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 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 12.04 ESM:
  libpolkit-backend-1-0           0.104-1ubuntu1.5
  policykit-1                     0.104-1ubuntu1.5

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

References:
  https://usn.ubuntu.com/3934-2
  https://usn.ubuntu.com/3934-1
  CVE-2019-6133
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