{ "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/centos6els/vex/2023/cve-2023-50868-els_os-centos6els.json" } ], "tracking": { "current_release_date": "2026-06-12T15:28:30Z", "generator": { "date": "2026-06-12T15:28:30Z", "engine": { "name": "pyCSAF" } }, "id": "CVE-2023-50868-ELS_OS-CENTOS6ELS", "initial_release_date": "2023-01-01T00:00:00Z", "revision_history": [ { "date": "2023-01-01T00:00:00Z", "number": "1", "summary": "Initial version" }, { "date": "2025-10-16T13:40:08Z", "number": "2", "summary": "Official Publication" }, { "date": "2025-12-23T20:26:03Z", "number": "3", "summary": "Update document" }, { "date": "2026-06-12T15:28:30Z", "number": "4", "summary": "Update document" } ], "status": "final", "version": "4" }, "title": "Security update on CVE-2023-50868" }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_name", "name": "Community Enterprise Operating System 6", "product": { "name": "Community Enterprise Operating System 6", "product_id": "CentOS-6", "product_identification_helper": { "cpe": "cpe:2.3:o:centos:centos:6:*:*:*:*:*:*:*" } } } ], "category": "product_family", "name": "Community Enterprise Operating System" } ], "category": "vendor", "name": "Red Hat, Inc." }, { "branches": [ { "branches": [ { "category": "product_version", "name": "dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product": { "name": "dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_id": "dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_identification_helper": { "purl": "pkg:rpm/tuxcare/dhcp-common@4.1.1-64.P1.el6.cloudlinux.els?arch=x86_64&epoch=12" } } } ], "category": "architecture", "name": "x86_64" } ], "category": "vendor", "name": "TuxCare" }, { "branches": [ { "branches": [ { "category": "product_version", "name": "dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product": { "name": "dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_id": "dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/dhcp@4.1.1-64.P1.el6.cloudlinux.els?arch=x86_64&epoch=12" } } }, { "category": "product_version", "name": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product": { "name": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_id": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/dhcp-devel@4.1.1-64.P1.el6.cloudlinux.els?arch=x86_64&epoch=12" } } }, { "category": "product_version", "name": "dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product": { "name": "dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_id": "dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/dhclient@4.1.1-64.P1.el6.cloudlinux.els?arch=x86_64&epoch=12" } } } ], "category": "architecture", "name": "x86_64" }, { "branches": [ { "category": "product_version", "name": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "product": { "name": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "product_id": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "product_identification_helper": { "purl": "pkg:rpm/cloudlinux/dhcp-devel@4.1.1-64.P1.el6.cloudlinux.els?arch=i686&epoch=12" } } } ], "category": "architecture", "name": "i686" } ], "category": "vendor", "name": "CloudLinux" } ], "relationships": [ { "category": "default_component_of", "full_product_name": { "name": "dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" }, "product_reference": "dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" }, "product_reference": "dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" }, "product_reference": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686" }, "product_reference": "dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "relates_to_product_reference": "CentOS-6" }, { "category": "default_component_of", "full_product_name": { "name": "dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64 as a component of Community Enterprise Operating System 6", "product_id": "CentOS-6:dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" }, "product_reference": "dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "relates_to_product_reference": "CentOS-6" } ] }, "vulnerabilities": [ { "cve": "CVE-2023-50868", "cwe": { "id": "CWE-400", "name": "Uncontrolled Resource Consumption" }, "notes": [ { "category": "description", "text": "The Closest Encloser Proof aspect of the DNS protocol (in RFC 5155 when RFC 9276 guidance is skipped) allows remote attackers to cause a denial of service (CPU consumption for SHA-1 computations) via DNSSEC responses in a random subdomain attack, aka the \"NSEC3\" issue. The RFC 5155 specification implies that an algorithm must perform thousands of iterations of a hash function in certain situations.", "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": [ "CentOS-6:dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" ] }, "references": [ { "category": "self", "summary": "Canonical URL", "url": "https://cve.tuxcare.com/els/cve/CVE-2023-50868" }, { "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-2023-50868", "url": "https://access.redhat.com/security/cve/CVE-2023-50868" }, { "category": "external", "summary": "https://bugzilla.suse.com/show_bug.cgi?id=1219826", "url": "https://bugzilla.suse.com/show_bug.cgi?id=1219826" }, { "category": "external", "summary": "https://datatracker.ietf.org/doc/html/rfc5155", "url": "https://datatracker.ietf.org/doc/html/rfc5155" }, { "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-2023-50868", "url": "https://kb.isc.org/docs/cve-2023-50868" }, { "category": "external", "summary": 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"summary": "https://security.netapp.com/advisory/ntap-20240307-0008/", "url": "https://security.netapp.com/advisory/ntap-20240307-0008/" }, { "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://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/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/", "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/" } ], "release_date": "2024-02-13T00:00:00Z", "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": [ "CentOS-6:dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" ] } ], "threats": [ { "category": "impact", "details": "Important" }, { "category": "impact", "date": "2026-06-12T13:00:26.471604Z", "details": "Not vulnerable — CVE-2023-50868 targets DNSSEC validators processing NSEC3 “closest encloser” proofs and is scoped by the vendor to BIND 9, not ISC DHCP. The dhcp 4.1.1 service does not perform DNSSEC validation or execute NSEC/NSEC3 hashing, and distribution security trackers list only DNS resolver packages (e.g., bind9, unbound, dnsmasq, powerdns, knot-resolver) as affected—not dhcp. Because the vulnerable code path is absent and not reachable in the dhcp component, this CVE does not apply.", "product_ids": [ "CentOS-6:dhclient-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-common-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64", "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.i686", "CentOS-6:dhcp-devel-12:4.1.1-64.P1.el6.cloudlinux.els.x86_64" ] } ] } ] }