Ubuntu 22.04 LTS USN-5408-1 Critical: Dnsmasq Code Execution

ubuntu

May 10, 2022

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

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.

Topics Covered

security advisory Ubuntu arbitrary code dnsmasq risk summary

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.