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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

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 service.

(CVE-2023-50868)

It was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP

packet size as required by DNS Flag Day 2020. This issue only affected

Ubunt...

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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