{ "document": { "aggregate_severity": { "namespace": "https://access.redhat.com/security/updates/classification/", "text": "Moderate" }, "category": "csaf_security_advisory", "csaf_version": "2.0", "distribution": { "text": "Copyright © Red Hat, Inc. All rights reserved.", "tlp": { "label": "WHITE", "url": "https://www.first.org/tlp/" } }, "lang": "en", "notes": [ { "category": "summary", "text": "An update for unbound is now available for Red Hat Enterprise Linux 8.6 Extended Update Support.\n\nRed Hat Product Security has rated this update as having a security impact of\nModerate. A Common Vulnerability Scoring System (CVSS) base score, which gives\na detailed severity rating, is available for each vulnerability from the CVE\nlink(s) in the References section.", "title": "Topic" }, { "category": "general", "text": "The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver.\n\nSecurity Fix(es):\n\n* unbound: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack) (CVE-2022-3204)\n\n* unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names (CVE-2022-30699)\n\n* unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names (CVE-2022-30698)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.", "title": "Details" }, { "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 Red Hat Inc. and provide a link to the original.", "title": "Terms of Use" } ], "publisher": { "category": "vendor", "contact_details": "https://access.redhat.com/security/team/contact/", "issuing_authority": "Red Hat Product Security is responsible for vulnerability handling across all Red Hat products and services.", "name": "Red Hat Product Security", "namespace": "https://www.redhat.com" }, "references": [ { "category": "self", "summary": "https://access.redhat.com/errata/RHSA-2024:2045", "url": "https://access.redhat.com/errata/RHSA-2024:2045" }, { "category": "external", "summary": "https://access.redhat.com/security/updates/classification/#moderate", "url": "https://access.redhat.com/security/updates/classification/#moderate" }, { "category": "external", "summary": "2116725", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2116725" }, { "category": "external", "summary": "2116729", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2116729" }, { "category": "external", "summary": "2128947", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2128947" }, { "category": "self", "summary": "Canonical URL", "url": "https://security.access.redhat.com/data/csaf/v2/advisories/2024/rhsa-2024_2045.json" } ], "title": "Red Hat Security Advisory: unbound security update", "tracking": { "current_release_date": "2026-03-18T02:38:34+00:00", "generator": { "date": "2026-03-18T02:38:34+00:00", "engine": { "name": "Red Hat SDEngine", "version": "4.7.3" } }, "id": "RHSA-2024:2045", "initial_release_date": "2024-04-25T06:53:07+00:00", "revision_history": [ { "date": "2024-04-25T06:53:07+00:00", "number": "1", "summary": "Initial version" }, { "date": "2024-04-25T06:53:07+00:00", "number": "2", "summary": "Last updated version" }, { "date": "2026-03-18T02:38:34+00:00", "number": "3", "summary": "Last generated version" } ], "status": "final", "version": "3" } }, "product_tree": { 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The attack can cause a resolver to spend a lot of time and resources resolving records under a malicious delegation point where a considerable number of unresponsive NS records reside. This issue can trigger high CPU usage in some resolver implementations that continually look in the cache for resolved NS records in that delegation, leading to degraded performance and, eventually, a denial of service in orchestrated attacks.", "title": "Vulnerability description" }, { "category": "summary", "text": "unbound: NRDelegation attack leads to uncontrolled resource consumption (Non-Responsive Delegation Attack)", "title": "Vulnerability summary" }, { "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" } ], "product_status": { "fixed": [ "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.aarch64", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.ppc64le", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.s390x", 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"https://nvd.nist.gov/vuln/detail/CVE-2022-3204", "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-3204" }, { "category": "external", "summary": "https://nlnetlabs.nl/downloads/unbound/CVE-2022-3204.txt", "url": "https://nlnetlabs.nl/downloads/unbound/CVE-2022-3204.txt" } ], "release_date": "2022-09-21T00:00:00+00:00", "remediations": [ { "category": "vendor_fix", "date": "2024-04-25T06:53:07+00:00", "details": "For details on how to apply this update, refer to:\n\nhttps://access.redhat.com/articles/11258", "product_ids": [ "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.aarch64", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.ppc64le", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.s390x", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.x86_64", "AppStream-8.6.0.Z.EUS:python3-unbound-debuginfo-0:1.7.3-17.el8_6.5.aarch64", "AppStream-8.6.0.Z.EUS:python3-unbound-debuginfo-0:1.7.3-17.el8_6.5.i686", 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"description", "text": "A flaw was found in Unbound, which is vulnerable to a novel type of \"ghost domain names\" attack. The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before the expiry of the delegation information by querying Unbound for a second-level subdomain in which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation.", "title": "Vulnerability description" }, { "category": "summary", "text": "unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names", "title": "Vulnerability summary" }, { "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" } ], "product_status": { "fixed": [ "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.aarch64", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.ppc64le", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.s390x", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.x86_64", 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The vulnerability works by targeting an Unbound instance. Unbound is queried for a subdomain of a rogue domain name. The rogue nameserver returns delegation information for the subdomain that updates Unbound's delegation cache. This action can be repeated before the expiry of the delegation information by querying Unbound for a second-level subdomain in which the rogue nameserver provides new delegation information. Since Unbound is a child-centric resolver, the ever-updating child delegation information can keep a rogue domain name resolvable long after revocation.", "title": "Vulnerability description" }, { "category": "summary", "text": "unbound: novel ghost domain attack that allows attackers to trigger continued resolvability of malicious domain names", "title": "Vulnerability summary" }, { "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" } ], "product_status": { "fixed": [ "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.aarch64", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.ppc64le", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.s390x", "AppStream-8.6.0.Z.EUS:python3-unbound-0:1.7.3-17.el8_6.5.x86_64", 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