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Ubuntu Security Notice USN-6034-1

Ubuntu Security Notice USN-6034-1
Posted Apr 20, 2023
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 6034-1 - It was discovered that Dnsmasq was sending large DNS messages over UDP, possibly causing transmission failures due to IP fragmentation. This update lowers the default maximum size of DNS messages to improve transmission reliability over UDP.

tags | advisory, udp
systems | linux, ubuntu
advisories | CVE-2023-28450
SHA-256 | c4992069af8cbbce8803ac455250932b08babf1c097f9d0ca6ff6c63035da835

Ubuntu Security Notice USN-6034-1

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-6034-1
April 20, 2023

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

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Dnsmasq could cause transmission reliability issues when
sending large DNS messages.

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

Details:

It was discovered that Dnsmasq was sending large DNS messages
over UDP, possibly causing transmission failures due to IP
fragmentation. This update lowers the default maximum size of
DNS messages to improve transmission reliability over UDP.

Update instructions:

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

Ubuntu 22.10:
dnsmasq-base 2.86-1.1ubuntu2.1

Ubuntu 22.04 LTS:
dnsmasq-base 2.86-1.1ubuntu0.3

Ubuntu 20.04 LTS:
dnsmasq-base 2.80-1.1ubuntu1.7

Ubuntu 18.04 LTS:
dnsmasq-base 2.79-1ubuntu0.7

Ubuntu 16.04 ESM:
dnsmasq-base 2.79-1ubuntu0.16.04.1+esm2

Ubuntu 14.04 ESM:
dnsmasq-base 2.68-1ubuntu0.2+esm2

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-6034-1
CVE-2023-28450

Package Information:
https://launchpad.net/ubuntu/+source/dnsmasq/2.86-1.1ubuntu2.1
https://launchpad.net/ubuntu/+source/dnsmasq/2.86-1.1ubuntu0.3
https://launchpad.net/ubuntu/+source/dnsmasq/2.80-1.1ubuntu1.7
https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1ubuntu0.7

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