CVE-2023-50387 (GCVE-0-2023-50387)

Vulnerability from cvelistv5 – Published: 2024-02-14 00:00 – Updated: 2025-11-04 18:20
VLAI
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • n/a
  • CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
URL Tags
https://www.athene-center.de/aktuelles/key-trap
https://nlnetlabs.nl/news/2024/Feb/13/unbound-1.1…
https://kb.isc.org/docs/cve-2023-50387
https://docs.powerdns.com/recursor/security-advis…
https://www.theregister.com/2024/02/13/dnssec_vul…
https://news.ycombinator.com/item?id=39367411
https://www.securityweek.com/keytrap-dns-attack-c…
https://www.isc.org/blogs/2024-bind-security-release/
https://news.ycombinator.com/item?id=39372384
https://gitlab.nic.cz/knot/knot-resolver/-/releas…
https://lists.thekelleys.org.uk/pipermail/dnsmasq…
https://msrc.microsoft.com/update-guide/vulnerabi…
https://access.redhat.com/security/cve/CVE-2023-50387
https://bugzilla.suse.com/show_bug.cgi?id=1219823
https://www.athene-center.de/fileadmin/content/PD…
http://www.openwall.com/lists/oss-security/2024/02/16/2 mailing-list
http://www.openwall.com/lists/oss-security/2024/02/16/3 mailing-list
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.debian.org/debian-lts-announce/2024… mailing-list
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://lists.fedoraproject.org/archives/list/pac… vendor-advisory
https://security.netapp.com/advisory/ntap-2024030…
https://lists.debian.org/debian-lts-announce/2024… mailing-list
https://lists.debian.org/debian-lts-announce/2024…
https://lists.debian.org/debian-lts-announce/2024…
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…
https://lists.fedoraproject.org/archives/list/pac…
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      "descriptions": "[{\"lang\": \"en\", \"value\": \"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.\"}, {\"lang\": \"es\", \"value\": \"Ciertos aspectos DNSSEC del protocolo DNS (en RFC 4035 y RFC relacionados) permiten a atacantes remotos provocar una denegaci\\u00f3n de servicio (consumo de CPU) a trav\\u00e9s de una o m\\u00e1s respuestas DNSSEC cuando hay una zona con muchos registros DNSKEY y RRSIG, tambi\\u00e9n conocido como \\\"KeyTrap\\\". \\\" asunto. La especificaci\\u00f3n del protocolo implica que un algoritmo debe evaluar todas las combinaciones de registros DNSKEY y RRSIG.\"}]",
      "id": "CVE-2023-50387",
      "lastModified": "2024-11-21T08:36:56.937",
      "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}]}",
      "published": "2024-02-14T16:15:45.300",
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      "sourceIdentifier": "cve@mitre.org",
      "vulnStatus": "Modified",
      "weaknesses": "[{\"source\": \"nvd@nist.gov\", \"type\": \"Primary\", \"description\": [{\"lang\": \"en\", \"value\": \"CWE-770\"}]}]"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-50387\",\"sourceIdentifier\":\"cve@mitre.org\",\"published\":\"2024-02-14T16:15:45.300\",\"lastModified\":\"2025-11-04T19:16:14.237\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"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.\"},{\"lang\":\"es\",\"value\":\"Ciertos aspectos DNSSEC del protocolo DNS (en RFC 4035 y RFC relacionados) permiten a atacantes remotos provocar una denegaci\u00f3n de servicio (consumo de CPU) a trav\u00e9s de una o m\u00e1s respuestas DNSSEC cuando hay una zona con muchos registros DNSKEY y RRSIG, tambi\u00e9n conocido como \\\"KeyTrap\\\". \\\" asunto. La especificaci\u00f3n del protocolo implica que un algoritmo debe evaluar todas las combinaciones de registros DNSKEY y 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\"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6FV5O347JTX7P5OZA6NGO4MKTXRXMKOZ/\", \"name\": \"FEDORA-2024-c967c7d287\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IGSLGKUAQTW5JPPZCMF5YPEYALLRUZZ6/\", \"name\": \"FEDORA-2024-e00eceb11c\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZDZFMEKQTZ4L7RY46FCENWFB5MDT263R/\", \"name\": \"FEDORA-2024-fae88b73eb\", \"tags\": [\"vendor-advisory\"]}, {\"url\": \"https://security.netapp.com/advisory/ntap-20240307-0007/\"}, {\"url\": \"https://lists.debian.org/debian-lts-announce/2024/05/msg00011.html\", \"name\": \"[debian-lts-announce] 20240517 [SECURITY] [DLA 3816-1] bind9 security update\", \"tags\": [\"mailing-list\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"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.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"text\", \"description\": \"n/a\"}]}], \"providerMetadata\": {\"orgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"shortName\": \"mitre\", \"dateUpdated\": \"2024-06-10T16:14:16.780Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2023-50387\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-04T18:20:34.949Z\", \"dateReserved\": \"2023-12-07T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2024-02-14T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.