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Ubuntu Security Notice USN-4398-2
June 16, 2020

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

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

Software Description:
- dbus: simple interprocess messaging system

Details:

USN-4398-1 fixed a vulnerability in DBus. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory 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 14.04 ESM:
  libdbus-1-3                     1.6.18-0ubuntu4.5+esm2

Ubuntu 12.04 ESM:
  libdbus-1-3                     1.4.18-1ubuntu1.10

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

References:
  https://usn.ubuntu.com/4398-2
  https://usn.ubuntu.com/4398-1
  CVE-2020-12049