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Ubuntu 18.04 LTS, USN-6657-2 Moderate: Dnsmasq DoS Security Fix

ubuntu
Calendar Grey April 24, 2024
Dist Ubuntu Esm H88
Dnsmasq issues significant security patches for Ubuntu 16.04 and 18.04, addressing serious DoS vulnerabilities. Ensure your systems are secure today!
Several security issues were fixed in Dnsmasq.

Summary

A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 18.04 LTS (Available with Ubuntu Pro) - Ubuntu 16.04 LTS (Available with Ubuntu Pro) Summary: Several security issues were fixed in Dnsmasq. Software Description: - dnsmasq: Small caching DNS proxy and DHCP/TFTP server Details: USN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS. Original advisory details: Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered that Dnsmasq icorrectly handled validating DNSSEC messages. A remote attacker could possibly use this issue to cause Dnsmasq to consume resources, leading to a denial of service. (CVE-2023-50387) It was discovered that Dnsmasq incorrectly handled preparing an NSEC3 closest encloser proof. A remote attacker could possibly use this issue to cause Dnsmasq to consume resources, leading to a denial of...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service software update Ubuntu security issues resource consumption dnsmasq

Update Instructions

The problem can be corrected by updating your system to the following package versions: Ubuntu 18.04 LTS (Available with Ubuntu Pro): dnsmasq-base 2.90-0ubuntu0.18.04.1+esm1 Ubuntu 16.04 LTS (Available with Ubuntu Pro): dnsmasq-base 2.90-0ubuntu0.16.04.1+esm1 This update uses a new upstream release, which includes additional bug fixes. After a standard system update you need to reboot your computer to make all the necessary changes.

References

https://ubuntu.com/security/notices/USN-6657-2

https://ubuntu.com/security/notices/USN-6657-1

CVE-2023-28450, CVE-2023-50387, CVE-2023-50868

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-6657-2

Topics%20covered

Topics Covered

security advisory denial of service software update Ubuntu security issues resource consumption dnsmasq

Package Information

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