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Ubuntu Security Notice USN-3876-2
January 31, 2019

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in Avahi.

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

Details:

USN-3876-1 fixed a vulnerability in Avahi. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory 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 12.04 ESM:
  avahi-daemon                    0.6.30-5ubuntu2.3
  libavahi-core7                  0.6.30-5ubuntu2.3

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

References:
  https://usn.ubuntu.com/usn/usn-3876-2
  https://usn.ubuntu.com/usn/usn-3876-1
  CVE-2017-6519, CVE-2018-1000845