Advisory Published

USN-6657-1: Dnsmasq vulnerabilities

First published: Mon Feb 26 2024(Updated: )

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 Ubuntu 23.10. (CVE-2023-28450)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/dnsmasq-base<2.90-0ubuntu0.23.10.1
2.90-0ubuntu0.23.10.1
Ubuntu Ubuntu=23.10
All of
ubuntu/dnsmasq-base<2.90-0ubuntu0.22.04.1
2.90-0ubuntu0.22.04.1
Ubuntu Ubuntu=22.04
All of
ubuntu/dnsmasq-base<2.90-0ubuntu0.20.04.1
2.90-0ubuntu0.20.04.1
Ubuntu Ubuntu=20.04

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