A Dnsmasq security update has been released for Ubuntu Linux 14.04 ESM, 16.04 ESM, 18.04 LTS, 20.04 LTS, 21.10, and 22.04 LTS.

USN-5408-1: Dnsmasq vulnerability

==========================================================================
Ubuntu Security Notice USN-5408-1
May 10, 2022

dnsmasq vulnerability
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 21.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Dnsmasq could be made to execute arbitrary code or expose
sensitive information if it received a specially crafted input.

Software Description:
- dnsmasq: Small caching DNS proxy and DHCP/TFTP server

Details:

Petr Menšík and Richard Johnson discovered that Dnsmasq incorrectly handled
certain inputs. An attacker could possibly use this issue to execute
arbitrary code or expose sensitive information.

Update instructions:

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

Ubuntu 22.04 LTS:
dnsmasq 2.86-1.1ubuntu0.1
dnsmasq-base 2.86-1.1ubuntu0.1
dnsmasq-utils 2.86-1.1ubuntu0.1

Ubuntu 21.10:
dnsmasq 2.85-1ubuntu2.1
dnsmasq-base 2.85-1ubuntu2.1
dnsmasq-utils 2.85-1ubuntu2.1

Ubuntu 20.04 LTS:
dnsmasq 2.80-1.1ubuntu1.5
dnsmasq-base 2.80-1.1ubuntu1.5
dnsmasq-utils 2.80-1.1ubuntu1.5

Ubuntu 18.04 LTS:
dnsmasq 2.79-1ubuntu0.6
dnsmasq-base 2.79-1ubuntu0.6
dnsmasq-utils 2.79-1ubuntu0.6

Ubuntu 16.04 ESM:
dnsmasq 2.75-1ubuntu0.16.04.10+esm1
dnsmasq-base 2.75-1ubuntu0.16.04.10+esm1
dnsmasq-utils 2.75-1ubuntu0.16.04.10+esm1

Ubuntu 14.04 ESM:
dnsmasq 2.68-1ubuntu0.2+esm1
dnsmasq-base 2.68-1ubuntu0.2+esm1
dnsmasq-utils 2.68-1ubuntu0.2+esm1

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

References:
  https://ubuntu.com/security/notices/USN-5408-1
CVE-2022-0934

Package Information:
  https://launchpad.net/ubuntu/+source/dnsmasq/2.86-1.1ubuntu0.1
  https://launchpad.net/ubuntu/+source/dnsmasq/2.85-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/dnsmasq/2.80-1.1ubuntu1.5
  https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1ubuntu0.6