{ "document": { "aggregate_severity": { "text": "High" }, "category": "csaf_vex", "csaf_version": "2.0", "distribution": { "text": "TuxCare License Agreement", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Cloud Linux Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://tuxcare.com/contact/", "name": "TuxCare", "namespace": "https://tuxcare.com/" }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://security.tuxcare.com/csaf/v2/els_os/ubuntu16.04els/vex/2023/cve-2023-50387-els_os-ubuntu16_04els.json" } ], "title": "Security update on CVE-2023-50387", "tracking": { "current_release_date": "2025-12-23T22:15:38Z", "generator": { "date": "2025-12-23T22:15:38Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2023-50387-ELS_OS-UBUNTU16.04ELS", "initial_release_date": "2023-01-01T00:00:00Z", "revision_history": [ { "date": "2023-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-11-29T17:00:10Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T22:15:38Z", "number": "3", "summary": "Update document" } ], "status": "final", "version": "2" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Ubuntu 16.04", "product": { "name": "Ubuntu 16.04", "product_id": "Ubuntu-16", "product_identification_helper": { "cpe": "cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*" } } } ], "category": "product_family", "name": "Ubuntu" } ], "category": "vendor", "name": "Canonical Ltd." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "product": { "name": "isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "product_id": "isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-client@4.3.3-5ubuntu12.11?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-client@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-client-ddns@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-dev@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-common@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-relay@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-server@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } }, { "category": "product_version", "name": "isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product": { "name": "isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_id": "isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "product_identification_helper": { "purl": "pkg:deb/cloudlinux/isc-dhcp-server-ldap@4.3.3-5ubuntu12.11%2Btuxcare.els2?arch=amd64" } } } ], "category": "architecture", "name": "amd64" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64" }, "product_reference": "isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" }, { "category": "default_component_of", "full_product_name": { "name": "isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64 as a component of Ubuntu 16.04", "product_id": "Ubuntu-16:isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" }, "product_reference": "isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "relates_to_product_reference": "Ubuntu-16" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-50387", "cwe": { "id": "CWE-770", "name": "Allocation of Resources Without Limits or Throttling" }, "notes": [ { "category": "description", "text": "Certain DNSSEC aspects of the DNS protocol (in RFC 4033, 4034, 4035, 6840, and related RFCs) allow remote attackers to cause a denial of service (CPU consumption) via one or more DNSSEC responses, aka the \"KeyTrap\" issue. One of the concerns is that, when there is a zone with many DNSKEY and RRSIG records, the protocol specification implies that an algorithm must evaluate all combinations of DNSKEY and RRSIG records.", "title": "Vulnerability description" }, { "category": "general", "text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.", "title": "CVSS score applicability" }, { "category": "other", "text": "TuxCare has assessed that this vulnerability does not impact any currently supported TuxCare products. This evaluation may change as new information becomes available. For additional details regarding this vulnerability and affected products, refer to the provided references.", "title": "Statement" } ], "product_status": { "known_not_affected": [ "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "Ubuntu-16:isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-50387" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2024/02/16/2", "url": "http://www.openwall.com/lists/oss-security/2024/02/16/2" }, { "category": "external", "summary": "http://www.openwall.com/lists/oss-security/2024/02/16/3", "url": "http://www.openwall.com/lists/oss-security/2024/02/16/3" }, { "category": "external", "summary": "https://access.redhat.com/security/cve/CVE-2023-50387", "url": "https://access.redhat.com/security/cve/CVE-2023-50387" }, { "category": "external", "summary": "https://bugzilla.suse.com/show_bug.cgi?id=1219823", "url": "https://bugzilla.suse.com/show_bug.cgi?id=1219823" }, { "category": "external", "summary": "https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html", "url": "https://docs.powerdns.com/recursor/security-advisories/powerdns-advisory-2024-01.html" }, { "category": "external", "summary": "https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1", "url": "https://gitlab.nic.cz/knot/knot-resolver/-/releases/v5.7.1" }, { "category": "external", "summary": "https://kb.isc.org/docs/cve-2023-50387", "url": "https://kb.isc.org/docs/cve-2023-50387" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html", "url": "https://lists.debian.org/debian-lts-announce/2024/02/msg00006.html" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html", "url": "https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/", "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/", "url": 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"summary": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387", "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-50387" }, { "category": "external", "summary": "https://news.ycombinator.com/item?id=39367411", "url": "https://news.ycombinator.com/item?id=39367411" }, { "category": "external", "summary": "https://news.ycombinator.com/item?id=39372384", "url": "https://news.ycombinator.com/item?id=39372384" }, { "category": "external", "summary": "https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/", "url": "https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.19.1-released/" }, { "category": "external", "summary": "https://security.netapp.com/advisory/ntap-20240307-0007/", "url": "https://security.netapp.com/advisory/ntap-20240307-0007/" }, { "category": "external", "summary": "https://www.athene-center.de/aktuelles/key-trap", "url": "https://www.athene-center.de/aktuelles/key-trap" }, { "category": "external", "summary": "https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf", "url": "https://www.athene-center.de/fileadmin/content/PDF/Technical_Report_KeyTrap.pdf" }, { "category": "external", "summary": "https://www.isc.org/blogs/2024-bind-security-release/", "url": "https://www.isc.org/blogs/2024-bind-security-release/" }, { "category": "external", "summary": "https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/", "url": "https://www.securityweek.com/keytrap-dns-attack-could-disable-large-parts-of-internet-researchers/" }, { "category": "external", "summary": "https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/", "url": "https://www.theregister.com/2024/02/13/dnssec_vulnerability_internet/" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html", "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00001.html" }, { "category": "external", "summary": "https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html", "url": "https://lists.debian.org/debian-lts-announce/2024/11/msg00035.html" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/BUIP7T7Z4T3UHLXFWG6XIVDP4GYPD3AI/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/HVRDSJVZKMCXKKPP6PNR62T7RWZ3YSDZ/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RGS7JN6FZXUSTC2XKQHH27574XOULYYJ/" }, { "category": "external", "summary": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/" } ], "release_date": "2024-02-14T16:15:00Z", "scores": [ { "cvss_v3": { "attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1" }, "products": [ "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "Ubuntu-16:isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" ] } ], "threats": [ { "category": "impact", "details": "Important" }, { "category": "impact", "details": "important", "product_ids": [ "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-client-0:4.3.3-5ubuntu12.11.amd64", "Ubuntu-16:isc-dhcp-client-ddns-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-common-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-dev-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-relay-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-server-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64", "Ubuntu-16:isc-dhcp-server-ldap-0:4.3.3-5ubuntu12.11+tuxcare.els2.amd64" ] } ] } ] }