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Ubuntu Security Notice USN-5008-2

Ubuntu Security Notice USN-5008-2
Posted Jul 8, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 5008-2 - USN-5008-1 fixed a vulnerability in avahi. This update provides the corresponding update for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM. 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. Various other issues were also addressed.

tags | advisory, denial of service, local
systems | linux, unix, ubuntu
advisories | CVE-2021-3468
MD5 | e1c4e764357e853688e9af68baaed741

Ubuntu Security Notice USN-5008-2

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-5008-2
July 07, 2021

avahi vulnerability
==========================================================================

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

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

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

Software Description:
- 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.

Update instructions:

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

Ubuntu 16.04 ESM:
avahi-daemon 0.6.32~rc+dfsg-1ubuntu2.3+esm1
libavahi-core7 0.6.32~rc+dfsg-1ubuntu2.3+esm1

Ubuntu 14.04 ESM:
avahi-daemon 0.6.31-4ubuntu1.3+esm1
libavahi-core7 0.6.31-4ubuntu1.3+esm1

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

References:
https://ubuntu.com/security/notices/USN-5008-2
https://ubuntu.com/security/notices/USN-5008-1
CVE-2021-3468
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