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Ubuntu Security Notice USN-4137-1
September 23, 2019

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

- Ubuntu 19.04

Summary:

Mosquitto could be made to crash or run programs if it received
specially crafted network traffic.

Software Description:
- mosquitto: MQTT version 3.1/3.1.1 compatible message broker

Details:

It was discovered that Mosquitto incorrectly handled certain specially crafted
input and network packets. A remote attacker could use this to cause a denial
of service.

Update instructions:

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

Ubuntu 19.04:
  libmosquitto1                   1.5.7-1ubuntu0.1
  libmosquittopp1                 1.5.7-1ubuntu0.1
  mosquitto                       1.5.7-1ubuntu0.1
  mosquitto-clients               1.5.7-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
  https://usn.ubuntu.com/4137-1
  CVE-2019-11779

Package Information:
  https://launchpad.net/ubuntu/+source/mosquitto/1.5.7-1ubuntu0.1