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Ubuntu 16.04 ESM: 5008-2 Critical Avahi Denial of Service

ubuntu
Calendar Grey July 7, 2021
Dist Ubuntu Esm H88
Tackling the Avahi DoS vulnerability on Ubuntu 14.04 and 16.04 ESM by implementing timely security patches and corrective measures.
Avahi could be made to denial of service if it received a specially crafted input.

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.

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu avahi

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-5008-1

CVE-2021-3468

Severity
critical
Lowest
Low
Medium
High
Critical

July 07, 2021

Topics%20covered

Topics Covered

security advisory denial of service critical ubuntu avahi

Package Information

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