=========================================================================Ubuntu Security Notice USN-4023-1
June 20, 2019

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

- Ubuntu 18.10
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

Several security issues were fixed in Mosquitto.

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

Details:

It was discovered that Mosquitto broker 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 18.10:
  libmosquitto1                   1.4.15-2ubuntu0.18.10.3
  libmosquittopp1                 1.4.15-2ubuntu0.18.10.3
  mosquitto                       1.4.15-2ubuntu0.18.10.3
  mosquitto-clients               1.4.15-2ubuntu0.18.10.3

Ubuntu 18.04 LTS:
  libmosquitto1                   1.4.15-2ubuntu0.18.04.3
  libmosquittopp1                 1.4.15-2ubuntu0.18.04.3
  mosquitto                       1.4.15-2ubuntu0.18.04.3
  mosquitto-clients               1.4.15-2ubuntu0.18.04.3

Ubuntu 16.04 LTS:
  libmosquitto1                   1.4.8-1ubuntu0.16.04.7
  libmosquittopp1                 1.4.8-1ubuntu0.16.04.7
  mosquitto                       1.4.8-1ubuntu0.16.04.7
  mosquitto-clients               1.4.8-1ubuntu0.16.04.7

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

References:
  https://ubuntu.com/security/notices/USN-4023-1
  CVE-2017-7653, CVE-2017-7654

Package Information:
  https://launchpad.net/ubuntu/+source/mosquitto/1.4.15-2ubuntu0.18.10.3
  https://launchpad.net/ubuntu/+source/mosquitto/1.4.15-2ubuntu0.18.04.3
  https://launchpad.net/ubuntu/+source/mosquitto/1.4.8-1ubuntu0.16.04.7