Ubuntu 4976-1: Dnsmasq vulnerability

Advisories

==========================================================================
Ubuntu Security Notice USN-4976-1
June 02, 2021

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

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

- Ubuntu 21.04
- Ubuntu 20.10
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

Dnsmasq could be exposed to cache poisoning.

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

Details:

Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in
certain configurations. A remote attacker could possibly use this issue to
facilitate DNS cache poisoning attacks.

Update instructions:

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

Ubuntu 21.04:
  dnsmasq                         2.84-1ubuntu2.1
  dnsmasq-base                    2.84-1ubuntu2.1
  dnsmasq-utils                   2.84-1ubuntu2.1

Ubuntu 20.10:
  dnsmasq                         2.82-1ubuntu1.3
  dnsmasq-base                    2.82-1ubuntu1.3
  dnsmasq-utils                   2.82-1ubuntu1.3

Ubuntu 20.04 LTS:
  dnsmasq                         2.80-1.1ubuntu1.4
  dnsmasq-base                    2.80-1.1ubuntu1.4
  dnsmasq-utils                   2.80-1.1ubuntu1.4

Ubuntu 18.04 LTS:
  dnsmasq                         2.79-1ubuntu0.4
  dnsmasq-base                    2.79-1ubuntu0.4
  dnsmasq-utils                   2.79-1ubuntu0.4

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

References:
  https://ubuntu.com/security/notices/USN-4976-1
  CVE-2021-3448

Package Information:
  https://launchpad.net/ubuntu/+source/dnsmasq/2.84-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/dnsmasq/2.82-1ubuntu1.3
  https://launchpad.net/ubuntu/+source/dnsmasq/2.80-1.1ubuntu1.4
  https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1ubuntu0.4

Ubuntu 4976-1: Dnsmasq vulnerability

June 2, 2021

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 21.04 - Ubuntu 20.10 - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Dnsmasq could be exposed to cache poisoning. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: Petr Mensik discovered that Dnsmasq incorrectly randomized source ports in certain configurations. A remote attacker could possibly use this issue to facilitate DNS cache poisoning attacks.

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 21.04: dnsmasq 2.84-1ubuntu2.1 dnsmasq-base 2.84-1ubuntu2.1 dnsmasq-utils 2.84-1ubuntu2.1 Ubuntu 20.10: dnsmasq 2.82-1ubuntu1.3 dnsmasq-base 2.82-1ubuntu1.3 dnsmasq-utils 2.82-1ubuntu1.3 Ubuntu 20.04 LTS: dnsmasq 2.80-1.1ubuntu1.4 dnsmasq-base 2.80-1.1ubuntu1.4 dnsmasq-utils 2.80-1.1ubuntu1.4 Ubuntu 18.04 LTS: dnsmasq 2.79-1ubuntu0.4 dnsmasq-base 2.79-1ubuntu0.4 dnsmasq-utils 2.79-1ubuntu0.4 After a standard system update you need to reboot your computer to make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-4976-1

CVE-2021-3448

Severity
Ubuntu Security Notice USN-4976-1

Package Information

https://launchpad.net/ubuntu/+source/dnsmasq/2.84-1ubuntu2.1 https://launchpad.net/ubuntu/+source/dnsmasq/2.82-1ubuntu1.3 https://launchpad.net/ubuntu/+source/dnsmasq/2.80-1.1ubuntu1.4 https://launchpad.net/ubuntu/+source/dnsmasq/2.79-1ubuntu0.4

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