{"id":"USN-6657-2","summary":"dnsmasq vulnerabilities","details":"USN-6657-1 fixed several vulnerabilities in Dnsmasq. This update provides\nthe corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.\n\nOriginal advisory details:\n\n Elias Heftrig, Haya Schulmann, Niklas Vogel, and Michael Waidner discovered\n that Dnsmasq icorrectly handled validating DNSSEC messages. A remote\n attacker could possibly use this issue to cause Dnsmasq to consume\n resources, leading to a denial of service. (CVE-2023-50387)\n \n It was discovered that Dnsmasq incorrectly handled preparing an NSEC3\n closest encloser proof. A remote attacker could possibly use this issue to\n cause Dnsmasq to consume resources, leading to a denial of service.\n (CVE-2023-50868)\n \n It was discovered that Dnsmasq incorrectly set the maximum EDNS.0 UDP\n packet size as required by DNS Flag Day 2020. This issue only affected\n Ubuntu 23.10. (CVE-2023-28450)\n","modified":"2026-06-25T13:32:31.730245523Z","published":"2024-04-24T19:55:01Z","related":["UBUNTU-CVE-2023-28450","UBUNTU-CVE-2023-50387","UBUNTU-CVE-2023-50868"],"upstream":["CVE-2023-28450","CVE-2023-50387","CVE-2023-50868","UBUNTU-CVE-2023-28450","UBUNTU-CVE-2023-50387","UBUNTU-CVE-2023-50868"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-6657-2"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-28450"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-50387"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2023-50868"}],"affected":[{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.16.04.1+esm1"}]}],"versions":["2.75-1","2.75-1ubuntu0.16.04.1","2.75-1ubuntu0.16.04.2","2.75-1ubuntu0.16.04.3","2.75-1ubuntu0.16.04.4","2.75-1ubuntu0.16.04.5","2.75-1ubuntu0.16.04.7","2.75-1ubuntu0.16.04.8","2.75-1ubuntu0.16.04.10","2.75-1ubuntu0.16.04.10+esm1","2.79-1ubuntu0.16.04.1+esm1","2.79-1ubuntu0.16.04.1+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"dnsmasq","binary_version":"2.90-0ubuntu0.16.04.1+esm1"},{"binary_name":"dnsmasq-base","binary_version":"2.90-0ubuntu0.16.04.1+esm1"},{"binary_version":"2.90-0ubuntu0.16.04.1+esm1","binary_name":"dnsmasq-base-lua"},{"binary_version":"2.90-0ubuntu0.16.04.1+esm1","binary_name":"dnsmasq-utils"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2023-50387","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2023-50868","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6657-2.json"}},{"package":{"name":"dnsmasq","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/dnsmasq?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.90-0ubuntu0.18.04.1+esm1"}]}],"versions":["2.78-1","2.78-3","2.79-1","2.79-1ubuntu0.2","2.79-1ubuntu0.3","2.79-1ubuntu0.4","2.79-1ubuntu0.5","2.79-1ubuntu0.6","2.79-1ubuntu0.7"],"ecosystem_specific":{"binaries":[{"binary_name":"dnsmasq","binary_version":"2.90-0ubuntu0.18.04.1+esm1"},{"binary_name":"dnsmasq-base","binary_version":"2.90-0ubuntu0.18.04.1+esm1"},{"binary_version":"2.90-0ubuntu0.18.04.1+esm1","binary_name":"dnsmasq-base-lua"},{"binary_name":"dnsmasq-utils","binary_version":"2.90-0ubuntu0.18.04.1+esm1"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-6657-2.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"id":"CVE-2023-50387","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2023-50868"}]}}}],"schema_version":"1.7.5"}