USN-6129-2: Avahi vulnerability

Publication date

25 July 2023

Overview

Avahi could be made to crash if it received specially crafted DBus traffic.


Packages

  • avahi - IPv4LL network address configuration daemon

Details

USN-6129-1 fixed a vulnerability in Avahi. This update provides the
corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04
LTS.

Original advisory details:

It was discovered that Avahi incorrectly handled certain DBus messages. A
local attacker could possibly use this issue to cause Avahi to crash,
resulting in a denial of service.

USN-6129-1 fixed a vulnerability in Avahi. This update provides the
corresponding update for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 18.04
LTS.

Original advisory details:

It was discovered that Avahi incorrectly handled certain DBus messages. A
local attacker could possibly use this issue to cause Avahi to crash,
resulting in a denial of service.

Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
18.04 bionic avahi-daemon –  0.7-3.1ubuntu1.3+esm1  
16.04 xenial avahi-daemon –  0.6.32~rc+dfsg-1ubuntu2.3+esm2  
14.04 trusty avahi-daemon –  0.6.31-4ubuntu1.3+esm2  

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