A DBus security update has been released for Ubuntu Linux 20.04 LTS, 19.10, 18.04 LTS, and 16.04 LTS.

USN-4398-1: DBus vulnerability

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Ubuntu Security Notice USN-4398-1
June 16, 2020

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

- Ubuntu 20.04 LTS
- Ubuntu 19.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

DBus could be made to crash if it received specially crafted input.

Software Description:
- dbus: simple interprocess messaging system

Details:

Kevin Backhouse discovered that DBus incorrectly handled file descriptors.
A local attacker could possibly use this issue to cause DBus to crash,
resulting in a denial of service.

Update instructions:

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

Ubuntu 20.04 LTS:
dbus 1.12.16-2ubuntu2.1
libdbus-1-3 1.12.16-2ubuntu2.1

Ubuntu 19.10:
dbus 1.12.14-1ubuntu2.1
libdbus-1-3 1.12.14-1ubuntu2.1

Ubuntu 18.04 LTS:
dbus 1.12.2-1ubuntu1.2
libdbus-1-3 1.12.2-1ubuntu1.2

Ubuntu 16.04 LTS:
dbus 1.10.6-1ubuntu3.6
libdbus-1-3 1.10.6-1ubuntu3.6

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

References:
  https://usn.ubuntu.com/4398-1
CVE-2020-12049

Package Information:
  https://launchpad.net/ubuntu/+source/dbus/1.12.16-2ubuntu2.1
  https://launchpad.net/ubuntu/+source/dbus/1.12.14-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/dbus/1.12.2-1ubuntu1.2
  https://launchpad.net/ubuntu/+source/dbus/1.10.6-1ubuntu3.6