USN-5008-2: Avahi vulnerability

Publication date

7 July 2021

Overview

Avahi could be made to denial of service if it received a specially crafted input.


Packages

  • avahi - Avahi IPv4LL network address configuration daemon

Details

USN-5008-1 fixed a vulnerability in avahi. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Thomas Kremer discovered that Avahi incorrectly handled termination signals
on the Unix socket. A local attacker could possibly use this issue to cause
Avahi to hang, resulting in a denial of service.

USN-5008-1 fixed a vulnerability in avahi. This update provides
the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

Thomas Kremer discovered that Avahi incorrectly handled termination signals
on the Unix socket. A local attacker could possibly use this issue to cause
Avahi to hang, 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
16.04 xenial avahi-daemon –  0.6.32~rc+dfsg-1ubuntu2.3+esm1  
libavahi-core7 –  0.6.32~rc+dfsg-1ubuntu2.3+esm1  
14.04 trusty avahi-daemon –  0.6.31-4ubuntu1.3+esm1  
libavahi-core7 –  0.6.31-4ubuntu1.3+esm1  

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