=========================================================================Ubuntu Security Notice USN-3876-1
January 31, 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

Summary:

Several security issues were fixed in Avahi.

Software Description:
- avahi: Avahi IPv4LL network address configuration daemon

Details:

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

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

References:
  https://ubuntu.com/security/notices/USN-3876-1
  CVE-2017-6519, CVE-2018-1000845

Package Information:
  https://launchpad.net/ubuntu/+source/avahi/0.7-4ubuntu2.1
  https://launchpad.net/ubuntu/+source/avahi/0.7-3.1ubuntu1.2
  https://launchpad.net/ubuntu/+source/avahi/0.6.32~rc+dfsg-1ubuntu2.3
  https://launchpad.net/ubuntu/+source/avahi/0.6.31-4ubuntu1.3