cve-2020-12667
Vulnerability from cvelistv5
Published
2020-05-19 00:00
Modified
2024-08-04 12:04
Severity ?
EPSS score ?
Summary
Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an "NXNSAttack" issue. This is triggered by random subdomains in the NSDNAME in NS records.
References
{ containers: { adp: [ { affected: [ { cpes: [ "cpe:2.3:a:nic:knot_resolver:-:*:*:*:*:*:*:*", ], defaultStatus: "unknown", product: "knot_resolver", vendor: "nic", versions: [ { status: "affected", version: "-", }, ], }, ], metrics: [ { cvssV3_1: { 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", }, }, { other: { content: { id: "CVE-2020-12667", options: [ { Exploitation: "none", }, { Automatable: "yes", }, { "Technical Impact": "partial", }, ], role: "CISA Coordinator", timestamp: "2024-04-26T17:02:23.525566Z", version: "2.0.3", }, type: "ssvc", }, }, ], problemTypes: [ { descriptions: [ { cweId: "CWE-400", description: "CWE-400 Uncontrolled Resource Consumption", lang: "en", type: "CWE", }, ], }, ], providerMetadata: { dateUpdated: "2024-06-04T17:12:29.314Z", orgId: "134c704f-9b21-4f2e-91b3-4a467353bcc0", shortName: "CISA-ADP", }, title: "CISA ADP Vulnrichment", }, { providerMetadata: { dateUpdated: "2024-08-04T12:04:22.538Z", orgId: "af854a3a-2127-422b-91ae-364da2661108", shortName: "CVE", }, references: [ { tags: [ "x_transferred", ], url: "https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/", }, { tags: [ "x_transferred", ], url: "https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html", }, { name: "[oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigation", tags: [ "mailing-list", "x_transferred", ], url: "http://www.openwall.com/lists/oss-security/2020/05/19/2", }, { tags: [ "x_transferred", ], url: "http://cyber-security-group.cs.tau.ac.il/#", }, { name: "FEDORA-2020-bf68101ad3", tags: [ "vendor-advisory", "x_transferred", ], url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/", }, { name: "[debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update", tags: [ "mailing-list", "x_transferred", ], url: "https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html", }, ], title: "CVE Program Container", }, ], cna: { affected: [ { product: "n/a", vendor: "n/a", versions: [ { status: "affected", version: "n/a", }, ], }, ], datePublic: "2020-05-19T00:00:00", descriptions: [ { lang: "en", value: "Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an \"NXNSAttack\" issue. This is triggered by random subdomains in the NSDNAME in NS records.", }, ], problemTypes: [ { descriptions: [ { description: "n/a", lang: "en", type: "text", }, ], }, ], providerMetadata: { dateUpdated: "2024-04-26T07:06:02.945535", orgId: "8254265b-2729-46b6-b9e3-3dfca2d5bfca", shortName: "mitre", }, references: [ { url: "https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/", }, { url: "https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html", }, { name: "[oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigation", tags: [ "mailing-list", ], url: "http://www.openwall.com/lists/oss-security/2020/05/19/2", }, { url: "http://cyber-security-group.cs.tau.ac.il/#", }, { name: "FEDORA-2020-bf68101ad3", tags: [ "vendor-advisory", ], url: "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/", }, { name: "[debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update", tags: [ "mailing-list", ], url: "https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html", }, ], }, }, cveMetadata: { assignerOrgId: "8254265b-2729-46b6-b9e3-3dfca2d5bfca", assignerShortName: "mitre", cveId: "CVE-2020-12667", datePublished: "2020-05-19T00:00:00", dateReserved: "2020-05-05T00:00:00", dateUpdated: "2024-08-04T12:04:22.538Z", state: "PUBLISHED", }, dataType: "CVE_RECORD", dataVersion: "5.1", "vulnerability-lookup:meta": { nvd: "{\"cve\":{\"id\":\"CVE-2020-12667\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2020-05-19T13:15:11.763\",\"lastModified\":\"2024-11-21T05:00:01.607\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an \\\"NXNSAttack\\\" issue. This is triggered by random subdomains in the NSDNAME in NS records.\"},{\"lang\":\"es\",\"value\":\"Knot Resolver versiones anteriores a 5.1.1, permite la amplificación del tráfico mediante una respuesta DNS diseñada desde un servidor controlado por el atacante, también se conoce como un problema de \\\"NXNSAttack\\\". Esto es activado por subdominios aleatorios en los registros NS en NSDNAME.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:L/Au:N/C:N/I:N/A:P\",\"baseScore\":5.0,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"LOW\",\"authentication\":\"NONE\",\"confidentialityImpact\":\"NONE\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"PARTIAL\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":10.0,\"impactScore\":2.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":false}]},\"weaknesses\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"}]},{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-400\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:nic:knot_resolver:*:*:*:*:*:*:*:*\",\"versionEndExcluding\":\"5.1.1\",\"matchCriteriaId\":\"CFA28A54-33C9-49D7-9B04-28088B14DCE2\"}]}]}],\"references\":[{\"url\":\"http://cyber-security-group.cs.tau.ac.il/#\",\"source\":\"cve@mitre.org\",\"tags\":[\"Technical Description\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2020/05/19/2\",\"source\":\"cve@mitre.org\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/\",\"source\":\"cve@mitre.org\",\"tags\":[\"Technical Description\",\"Vendor Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/\",\"source\":\"cve@mitre.org\"},{\"url\":\"https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html\",\"source\":\"cve@mitre.org\",\"tags\":[\"Release Notes\",\"Vendor Advisory\"]},{\"url\":\"http://cyber-security-group.cs.tau.ac.il/#\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Technical Description\",\"Third Party Advisory\"]},{\"url\":\"http://www.openwall.com/lists/oss-security/2020/05/19/2\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Technical Description\",\"Vendor Advisory\"]},{\"url\":\"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\"},{\"url\":\"https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Release Notes\",\"Vendor Advisory\"]}]}}", vulnrichment: { containers: "{\"adp\": [{\"title\": \"CVE Program Container\", \"references\": [{\"url\": \"https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html\", \"tags\": [\"x_transferred\"]}, {\"url\": \"http://www.openwall.com/lists/oss-security/2020/05/19/2\", \"name\": \"[oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigation\", \"tags\": [\"mailing-list\", \"x_transferred\"]}, {\"url\": \"http://cyber-security-group.cs.tau.ac.il/#\", \"tags\": [\"x_transferred\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/\", \"name\": \"FEDORA-2020-bf68101ad3\", \"tags\": [\"vendor-advisory\", \"x_transferred\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html\", \"name\": \"[debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update\", \"tags\": [\"mailing-list\", \"x_transferred\"]}], \"providerMetadata\": {\"orgId\": \"af854a3a-2127-422b-91ae-364da2661108\", \"shortName\": \"CVE\", \"dateUpdated\": \"2024-08-04T12:04:22.538Z\"}}, {\"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\"}}, {\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2020-12667\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2024-04-26T17:02:23.525566Z\"}}}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:nic:knot_resolver:-:*:*:*:*:*:*:*\"], \"vendor\": \"nic\", \"product\": \"knot_resolver\", \"versions\": [{\"status\": \"affected\", \"version\": \"-\"}], \"defaultStatus\": \"unknown\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-400\", \"description\": \"CWE-400 Uncontrolled Resource Consumption\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2024-04-26T17:12:53.294Z\"}, \"title\": \"CISA ADP Vulnrichment\"}], \"cna\": {\"affected\": [{\"vendor\": \"n/a\", \"product\": \"n/a\", \"versions\": [{\"status\": \"affected\", \"version\": \"n/a\"}]}], \"datePublic\": \"2020-05-19T00:00:00\", \"references\": [{\"url\": \"https://en.blog.nic.cz/2020/05/19/nxnsattack-upgrade-resolvers-to-stop-new-kind-of-random-subdomain-attack/\"}, {\"url\": \"https://www.knot-resolver.cz/2020-05-19-knot-resolver-5.1.1.html\"}, {\"url\": \"http://www.openwall.com/lists/oss-security/2020/05/19/2\", \"name\": \"[oss-security] 20200519 [CVE-2020-12667] Knot Resolver 5.1.1 NXNSAttack mitigation\", \"tags\": [\"mailing-list\"]}, {\"url\": \"http://cyber-security-group.cs.tau.ac.il/#\"}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/76Y4FITMOH6RVPWAANGV7NB2ZHPJJGDQ/\", \"name\": \"FEDORA-2020-bf68101ad3\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/04/msg00017.html\", \"name\": \"[debian-lts-announce] 20240426 [SECURITY] [DLA 3795-1] knot-resolver security update\", \"tags\": [\"mailing-list\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"Knot Resolver before 5.1.1 allows traffic amplification via a crafted DNS answer from an attacker-controlled server, aka an \\\"NXNSAttack\\\" issue. This is triggered by random subdomains in the NSDNAME in NS records.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2024-04-26T07:06:02.945535\"}}}", cveMetadata: "{\"cveId\": \"CVE-2020-12667\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2024-08-04T12:04:22.538Z\", \"dateReserved\": \"2020-05-05T00:00:00\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2020-05-19T00:00:00\", \"assignerShortName\": \"mitre\"}", dataType: "CVE_RECORD", dataVersion: "5.1", }, }, }
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Sightings
Author | Source | Type | Date |
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Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.