CVE-2023-6516

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It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded.\nThis issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1."}], "impacts": [{"descriptions": [{"lang": "en", "value": "By exploiting this flaw, an attacker can cause the amount of memory used by a `named` resolver to go well beyond the configured `max-cache-size` limit. The effectiveness of the attack depends on a number of environmental factors, but in the worst case the attacker can exhaust all available memory on the host running `named`, leading to a denial-of-service condition."}]}], "workarounds": [{"lang": "en", "value": "No workarounds known."}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.48 or 9.16.48-S1."}], "credits": [{"lang": "en", "value": "ISC would like to thank Infoblox for bringing this vulnerability to our attention."}], "references": [{"url": "https://kb.isc.org/docs/cve-2023-6516", "name": "CVE-2023-6516", "tags": ["vendor-advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2024/02/13/1"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/"}, {"url": "https://security.netapp.com/advisory/ntap-20240503-0008/"}], "source": {"discovery": "EXTERNAL"}}, "adp": [{"problemTypes": [{"descriptions": [{"type": "CWE", "cweId": "CWE-789", "lang": "en", "description": "CWE-789 Memory Allocation with Excessive Size Value"}]}], "affected": [{"vendor": "isc", "product": "bind", "cpes": ["cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "versions": [{"version": "9.16.0", "status": "affected", "lessThanOrEqual": "9.16.45", "versionType": "custom"}, {"version": "9.16.8-s1", "status": "affected", "lessThanOrEqual": "9.16.45-s1", "versionType": "custom"}]}], "metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2024-02-20T16:01:15.527012Z", "id": "CVE-2023-6516", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "partial"}], "role": "CISA Coordinator", "version": "2.0.3"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-28T16:35:10.580Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T08:35:13.212Z"}, "title": "CVE Program Container", "references": [{"url": "https://kb.isc.org/docs/cve-2023-6516", "name": "CVE-2023-6516", "tags": ["vendor-advisory", "x_transferred"]}, {"url": "http://www.openwall.com/lists/oss-security/2024/02/13/1", "tags": ["x_transferred"]}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/", "tags": ["x_transferred"]}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/", "tags": ["x_transferred"]}, {"url": "https://security.netapp.com/advisory/ntap-20240503-0008/", "tags": ["x_transferred"]}]}]}}

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The effectiveness of the attack depends on a number of environmental factors, but in the worst case the attacker can exhaust all available memory on the host running `named`, leading to a denial-of-service condition."}]}], "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}}], "affected": [{"vendor": "ISC", "product": "BIND 9", "versions": [{"status": "affected", "version": "9.16.0", "versionType": "custom", "lessThanOrEqual": "9.16.45"}, {"status": "affected", "version": "9.16.8-S1", "versionType": "custom", "lessThanOrEqual": "9.16.45-S1"}], "defaultStatus": "unaffected"}], "exploits": [{"lang": "en", "value": "We are not aware of any active exploits."}], "solutions": [{"lang": "en", "value": "Upgrade to the patched release most closely related to your current version of BIND 9: 9.16.48 or 9.16.48-S1."}], "datePublic": "2024-02-13T00:00:00.000Z", "references": [{"url": "https://kb.isc.org/docs/cve-2023-6516", "name": "CVE-2023-6516", "tags": ["vendor-advisory"]}, {"url": "http://www.openwall.com/lists/oss-security/2024/02/13/1"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/"}, {"url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/"}, {"url": "https://security.netapp.com/advisory/ntap-20240503-0008/"}], "workarounds": [{"lang": "en", "value": "No workarounds known."}], "descriptions": [{"lang": "en", "value": "To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. 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This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded.\nThis issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1."}], "providerMetadata": {"orgId": "404fd4d2-a609-4245-b543-2c944a302a22", "shortName": "isc", "dateUpdated": "2024-05-03T13:06:07.107Z"}}}, "cveMetadata": {"cveId": "CVE-2023-6516", "state": "PUBLISHED", "dateUpdated": "2025-02-13T17:26:26.170Z", "dateReserved": "2023-12-05T10:44:59.435Z", "assignerOrgId": "404fd4d2-a609-4245-b543-2c944a302a22", "datePublished": "2024-02-13T14:05:28.933Z", "assignerShortName": "isc"}, "dataVersion": "5.1"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "BIND 9", "vendor": "ISC", "versions": [{"lessThanOrEqual": "9.16.45", "status": "affected", "version": "9.16.0", "versionType": "custom"}, {"lessThanOrEqual": "9.16.45-S1", "status": "affected", "version": "9.16.8-S1", "versionType": "custom"}]}], "source": "security-officer@isc.org"}, {"affectedData": [{"cpes": ["cpe:2.3:a:isc:bind:*:*:*:*:*:*:*:*"], "defaultStatus": "unknown", "product": "bind", "vendor": "isc", "versions": [{"lessThanOrEqual": "9.16.45", "status": "affected", "version": "9.16.0", "versionType": "custom"}, {"lessThanOrEqual": "9.16.45-s1", "status": "affected", "version": "9.16.8-s1", "versionType": "custom"}]}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:isc:bind:*:*:*:*:-:*:*:*", "matchCriteriaId": "1A19BB7A-F711-40C3-B395-03589018FE52", "versionEndIncluding": "9.16.45", "versionStartIncluding": "9.16.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.8:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "288EAD80-574B-4839-9C2C-81D6D088A733", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.11:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "3595F024-F910-4356-8B5B-D478960FF574", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.12:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "1B20F152-D0C3-4F07-83B3-5EA6B116F005", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.13:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "94661BA2-27F8-4FFE-B844-9404F735579D", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.14:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "53593603-E2AF-4925-A6E6-109F097A0FF2", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.21:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "751E37C2-8BFD-4306-95C1-8C01CE495FA4", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.32:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "CC432820-F1A2-4132-A673-2620119553C5", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.36:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "F70347F2-6750-4497-B8F4-2036F4F4443A", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.43:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "A4B53B73-DB81-4AC1-A4E6-89BB305D6514", "vulnerable": true}, {"criteria": "cpe:2.3:a:isc:bind:9.16.45:s1:*:*:supported_preview:*:*:*", "matchCriteriaId": "EC7357C9-AD62-4B7E-B013-780108BA562E", "vulnerable": true}], "negate": false, "operator": "OR"}]}, {"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:netapp:active_iq_unified_manager:-:*:*:*:*:vmware_vsphere:*:*", "matchCriteriaId": "3A756737-1CC4-42C2-A4DF-E1C893B4E2D5", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded.\nThis issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1."}, {"lang": "es", "value": "Para mantener eficiente su base de datos de cach\u00e9, `named` que se ejecuta como un solucionador recursivo intenta ocasionalmente limpiar la base de datos. Utiliza varios m\u00e9todos, incluidos algunos que son asincr\u00f3nicos: primero se asigna una peque\u00f1a porci\u00f3n de memoria que apunta al elemento de cach\u00e9 que se puede limpiar y luego se pone en cola para su posterior procesamiento. Se descubri\u00f3 que si el solucionador procesa continuamente patrones de consulta que desencadenan este tipo de mantenimiento de la base de datos de cach\u00e9, es posible que \"named\" no pueda manejar los eventos de limpieza de manera oportuna. Esto, a su vez, permite que la lista de eventos de limpieza en cola crezca infinitamente con el tiempo, lo que permite superar significativamente el l\u00edmite de \"tama\u00f1o m\u00e1ximo de cach\u00e9\" configurado. Este problema afecta a las versiones 9.16.0 a 9.16.45 y 9.16.8-S1 a 9.16.45-S1 de BIND 9."}], "id": "CVE-2023-6516", "lastModified": "2026-06-17T06:50:54.017", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-officer@isc.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2023-6516", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-02-20T16:01:15.527012Z", "version": "2.0.3"}}]}, "published": "2024-02-13T14:15:46.030", "references": [{"source": "security-officer@isc.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2024/02/13/1"}, {"source": "security-officer@isc.org", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2023-6516"}, {"source": "security-officer@isc.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/"}, {"source": "security-officer@isc.org", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/"}, {"source": "security-officer@isc.org", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20240503-0008/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "http://www.openwall.com/lists/oss-security/2024/02/13/1"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://kb.isc.org/docs/cve-2023-6516"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/PNNHZSZPG2E7NBMBNYPGHCFI4V4XRWNQ/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Mailing List", "Third Party Advisory"], "url": "https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Third Party Advisory"], "url": "https://security.netapp.com/advisory/ntap-20240503-0008/"}], "sourceIdentifier": "security-officer@isc.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-770"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-789"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"affected_release": [{"advisory": "RHSA-2024:1781", "cpe": "cpe:/a:redhat:enterprise_linux:8", "package": "bind9.16-32:9.16.23-0.16.el8_9.2", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-04-11T00:00:00Z"}, {"advisory": "RHSA-2024:1647", "cpe": "cpe:/a:redhat:rhel_eus:8.6", "package": "bind9.16-32:9.16.23-0.7.el8_6.5", "product_name": "Red Hat Enterprise Linux 8.6 Extended Update Support", "release_date": "2024-04-02T00:00:00Z"}, {"advisory": "RHSA-2024:1648", "cpe": "cpe:/a:redhat:rhel_eus:8.8", "package": "bind9.16-32:9.16.23-0.14.el8_8.4", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-04-02T00:00:00Z"}, {"advisory": "RHSA-2024:1789", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "bind-32:9.16.23-14.el9_3.4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-11T00:00:00Z"}, {"advisory": "RHSA-2024:1789", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "bind-dyndb-ldap-0:11.9-8.el9_3.3", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-11T00:00:00Z"}, {"advisory": "RHSA-2024:2551", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "bind-32:9.16.23-18.el9_4.1", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-30T00:00:00Z"}, {"advisory": "RHSA-2024:2551", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "bind-dyndb-ldap-0:11.9-9.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-30T00:00:00Z"}, {"advisory": "RHSA-2024:1800", "cpe": "cpe:/a:redhat:rhel_eus:9.0", "package": "bind-32:9.16.23-1.el9_0.5", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2024-04-15T00:00:00Z"}, {"advisory": "RHSA-2024:1800", "cpe": "cpe:/a:redhat:rhel_eus:9.0", "package": "bind-dyndb-ldap-0:11.9-7.el9_0.1", "product_name": "Red Hat Enterprise Linux 9.0 Extended Update Support", "release_date": "2024-04-15T00:00:00Z"}, {"advisory": "RHSA-2024:1803", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "bind-32:9.16.23-11.el9_2.4", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-04-15T00:00:00Z"}, {"advisory": "RHSA-2024:1803", "cpe": "cpe:/a:redhat:rhel_eus:9.2", "package": "bind-dyndb-ldap-0:11.9-8.el9_2.2", "product_name": "Red Hat Enterprise Linux 9.2 Extended Update Support", "release_date": "2024-04-15T00:00:00Z"}], "bugzilla": {"description": "bind9: Specific recursive query patterns may lead to an out-of-memory condition", "id": "2263911", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2263911"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "verified"}, "cwe": "CWE-400", "details": ["To keep its cache database efficient, `named` running as a recursive resolver occasionally attempts to clean up the database. It uses several methods, including some that are asynchronous: a small chunk of memory pointing to the cache element that can be cleaned up is first allocated and then queued for later processing. It was discovered that if the resolver is continuously processing query patterns triggering this type of cache-database maintenance, `named` may not be able to handle the cleanup events in a timely manner. This in turn enables the list of queued cleanup events to grow infinitely large over time, allowing the configured `max-cache-size` limit to be significantly exceeded.\nThis issue affects BIND 9 versions 9.16.0 through 9.16.45 and 9.16.8-S1 through 9.16.45-S1.", "A flaw was found in the `named` application, part of the bind9 package, which uses a cache database to speeds up DNS queries. To maintain its efficiency when running as a recursive name resolver, `named` performs a cache database clean up under certain conditions. This issue may allow an attacker to craft a continuous set of crafted queries, which can induce `named` to trigger the cleanup process with a high frequency, making the internal cleanup items queue to grow indefinitely. This can lead to an uncontrolled memory consumption and resource starvation, potentially making `named` consume all available memory in the host, leading to a Denial of Service of the targeted system."], "mitigation": {"lang": "en:us", "value": "There is no available mitigation for this issue other than applying the required fixes via the released updates."}, "name": "CVE-2023-6516", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "bind", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "dhcp", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-02-13T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2023-6516\nhttps://nvd.nist.gov/vuln/detail/CVE-2023-6516\nhttps://kb.isc.org/docs/cve-2023-6516"], "threat_severity": "Important"}

{}