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


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


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.


Package Information: