=========================================================================Ubuntu Security Notice USN-4120-1
September 03, 2019

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

- Ubuntu 19.04
- Ubuntu 18.04 LTS

Summary:

systemd-resolved would allow unprivileged users to change DNS settings.

Software Description:
- systemd: system and service manager

Details:

It was discovered that the systemd-resolved D-Bus interface did not
enforce appropriate access controls. A local unprivileged user could
exploit this to modify a system's DNS resolver settings.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 19.04:
  systemd                         240-6ubuntu5.6

Ubuntu 18.04 LTS:
  systemd                         237-3ubuntu10.28

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

References:
  https://ubuntu.com/security/notices/USN-4120-1
  CVE-2019-15718

Package Information:
  https://launchpad.net/ubuntu/+source/systemd/240-6ubuntu5.6
  https://launchpad.net/ubuntu/+source/systemd/237-3ubuntu10.28