USN-3876-1: Avahi vulnerabilities

31 January 2019

avahi vulnerabilities

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

  • Ubuntu 18.10
  • Ubuntu 18.04 LTS
  • Ubuntu 16.04 LTS
  • Ubuntu 14.04 LTS


Several security issues were fixed in Avahi.

Software Description

  • avahi - Avahi IPv4LL network address configuration daemon


Chad Seaman discovered that Avahi incorrectly handled certain messages. An attacker could possibly use this issue to cause a denial of service. (CVE-2017-6519, CVE-2018-1000845)

Update instructions

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

Ubuntu 18.10
avahi-daemon - 0.7-4ubuntu2.1
libavahi-core7 - 0.7-4ubuntu2.1
Ubuntu 18.04 LTS
avahi-daemon - 0.7-3.1ubuntu1.2
libavahi-core7 - 0.7-3.1ubuntu1.2
Ubuntu 16.04 LTS
avahi-daemon - 0.6.32~rc+dfsg-1ubuntu2.3
libavahi-core7 - 0.6.32~rc+dfsg-1ubuntu2.3
Ubuntu 14.04 LTS
avahi-daemon - 0.6.31-4ubuntu1.3
libavahi-core7 - 0.6.31-4ubuntu1.3

To update your system, please follow these instructions:

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