CVE-2021-25737
Vulnerability from cvelistv5
Published
2021-09-06 11:32
Modified
2024-09-16 21:04
Summary
A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.
Impacted products
Vendor Product Version
Kubernetes Kubernetes Version: unspecified   <
Version: unspecified   <
Version: unspecified   <
Version: unspecified   <
Create a notification for this product.
Show details on NVD website


{
   containers: {
      adp: [
         {
            providerMetadata: {
               dateUpdated: "2024-08-03T20:11:27.584Z",
               orgId: "af854a3a-2127-422b-91ae-364da2661108",
               shortName: "CVE",
            },
            references: [
               {
                  tags: [
                     "x_refsource_MISC",
                     "x_transferred",
                  ],
                  url: "https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY",
               },
               {
                  tags: [
                     "x_refsource_MISC",
                     "x_transferred",
                  ],
                  url: "https://github.com/kubernetes/kubernetes/issues/102106",
               },
               {
                  tags: [
                     "x_refsource_CONFIRM",
                     "x_transferred",
                  ],
                  url: "https://security.netapp.com/advisory/ntap-20211004-0004/",
               },
            ],
            title: "CVE Program Container",
         },
      ],
      cna: {
         affected: [
            {
               product: "Kubernetes",
               vendor: "Kubernetes",
               versions: [
                  {
                     lessThanOrEqual: "1.18.18",
                     status: "affected",
                     version: "unspecified",
                     versionType: "custom",
                  },
                  {
                     lessThanOrEqual: "1.19.10",
                     status: "affected",
                     version: "unspecified",
                     versionType: "custom",
                  },
                  {
                     lessThanOrEqual: "1.20.6",
                     status: "affected",
                     version: "unspecified",
                     versionType: "custom",
                  },
                  {
                     lessThanOrEqual: "1.21.0",
                     status: "affected",
                     version: "unspecified",
                     versionType: "custom",
                  },
               ],
            },
         ],
         credits: [
            {
               lang: "en",
               value: "John Howard",
            },
         ],
         datePublic: "2021-05-18T00:00:00",
         descriptions: [
            {
               lang: "en",
               value: "A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.",
            },
         ],
         metrics: [
            {
               cvssV3_1: {
                  attackComplexity: "LOW",
                  attackVector: "NETWORK",
                  availabilityImpact: "NONE",
                  baseScore: 2.7,
                  baseSeverity: "LOW",
                  confidentialityImpact: "LOW",
                  integrityImpact: "NONE",
                  privilegesRequired: "HIGH",
                  scope: "UNCHANGED",
                  userInteraction: "NONE",
                  vectorString: "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N",
                  version: "3.1",
               },
            },
         ],
         problemTypes: [
            {
               descriptions: [
                  {
                     cweId: "CWE-184",
                     description: "CWE-184 Incomplete Blacklist",
                     lang: "en",
                     type: "CWE",
                  },
               ],
            },
         ],
         providerMetadata: {
            dateUpdated: "2021-10-04T18:06:22",
            orgId: "a6081bf6-c852-4425-ad4f-a67919267565",
            shortName: "kubernetes",
         },
         references: [
            {
               tags: [
                  "x_refsource_MISC",
               ],
               url: "https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY",
            },
            {
               tags: [
                  "x_refsource_MISC",
               ],
               url: "https://github.com/kubernetes/kubernetes/issues/102106",
            },
            {
               tags: [
                  "x_refsource_CONFIRM",
               ],
               url: "https://security.netapp.com/advisory/ntap-20211004-0004/",
            },
         ],
         source: {
            defect: [
               "https://github.com/kubernetes/kubernetes/issues/102106",
            ],
            discovery: "EXTERNAL",
         },
         title: "Holes in EndpointSlice Validation Enable Host Network Hijack",
         x_generator: {
            engine: "Vulnogram 0.0.9",
         },
         x_legacyV4Record: {
            CVE_data_meta: {
               ASSIGNER: "security@kubernetes.io",
               DATE_PUBLIC: "2021-05-18T19:00:00.000Z",
               ID: "CVE-2021-25737",
               STATE: "PUBLIC",
               TITLE: "Holes in EndpointSlice Validation Enable Host Network Hijack",
            },
            affects: {
               vendor: {
                  vendor_data: [
                     {
                        product: {
                           product_data: [
                              {
                                 product_name: "Kubernetes",
                                 version: {
                                    version_data: [
                                       {
                                          version_affected: "<=",
                                          version_value: "1.18.18",
                                       },
                                       {
                                          version_affected: "<=",
                                          version_value: "1.19.10",
                                       },
                                       {
                                          version_affected: "<=",
                                          version_value: "1.20.6",
                                       },
                                       {
                                          version_affected: "<=",
                                          version_value: "1.21.0",
                                       },
                                    ],
                                 },
                              },
                           ],
                        },
                        vendor_name: "Kubernetes",
                     },
                  ],
               },
            },
            credit: [
               {
                  lang: "eng",
                  value: "John Howard",
               },
            ],
            data_format: "MITRE",
            data_type: "CVE",
            data_version: "4.0",
            description: {
               description_data: [
                  {
                     lang: "eng",
                     value: "A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.",
                  },
               ],
            },
            generator: {
               engine: "Vulnogram 0.0.9",
            },
            impact: {
               cvss: {
                  attackComplexity: "LOW",
                  attackVector: "NETWORK",
                  availabilityImpact: "NONE",
                  baseScore: 2.7,
                  baseSeverity: "LOW",
                  confidentialityImpact: "LOW",
                  integrityImpact: "NONE",
                  privilegesRequired: "HIGH",
                  scope: "UNCHANGED",
                  userInteraction: "NONE",
                  vectorString: "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N",
                  version: "3.1",
               },
            },
            problemtype: {
               problemtype_data: [
                  {
                     description: [
                        {
                           lang: "eng",
                           value: "CWE-184 Incomplete Blacklist",
                        },
                     ],
                  },
               ],
            },
            references: {
               reference_data: [
                  {
                     name: "https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY",
                     refsource: "MISC",
                     url: "https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY",
                  },
                  {
                     name: "https://github.com/kubernetes/kubernetes/issues/102106",
                     refsource: "MISC",
                     url: "https://github.com/kubernetes/kubernetes/issues/102106",
                  },
                  {
                     name: "https://security.netapp.com/advisory/ntap-20211004-0004/",
                     refsource: "CONFIRM",
                     url: "https://security.netapp.com/advisory/ntap-20211004-0004/",
                  },
               ],
            },
            source: {
               defect: [
                  "https://github.com/kubernetes/kubernetes/issues/102106",
               ],
               discovery: "EXTERNAL",
            },
         },
      },
   },
   cveMetadata: {
      assignerOrgId: "a6081bf6-c852-4425-ad4f-a67919267565",
      assignerShortName: "kubernetes",
      cveId: "CVE-2021-25737",
      datePublished: "2021-09-06T11:32:01.989085Z",
      dateReserved: "2021-01-21T00:00:00",
      dateUpdated: "2024-09-16T21:04:34.209Z",
      state: "PUBLISHED",
   },
   dataType: "CVE_RECORD",
   dataVersion: "5.1",
   "vulnerability-lookup:meta": {
      nvd: "{\"cve\":{\"id\":\"CVE-2021-25737\",\"sourceIdentifier\":\"jordan@liggitt.net\",\"published\":\"2021-09-06T12:15:07.673\",\"lastModified\":\"2024-11-21T05:55:19.310\",\"vulnStatus\":\"Modified\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"A security issue was discovered in Kubernetes where a user may be able to redirect pod traffic to private networks on a Node. Kubernetes already prevents creation of Endpoint IPs in the localhost or link-local range, but the same validation was not performed on EndpointSlice IPs.\"},{\"lang\":\"es\",\"value\":\"Se ha detectado un problema de seguridad en Kubernetes en el que un usuario puede ser capaz de redirigir el tráfico del pod a redes privadas en un Nodo. Kubernetes ya previene la creación de IPs de Endpoint en el rango localhost o link-local, pero no se ha llevado a cabo la misma comprobación en las IPs de EndpointSlice.\"}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"jordan@liggitt.net\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N\",\"baseScore\":2.7,\"baseSeverity\":\"LOW\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.2,\"impactScore\":1.4},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N\",\"baseScore\":4.8,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"HIGH\",\"userInteraction\":\"REQUIRED\",\"scope\":\"CHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"LOW\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":1.7,\"impactScore\":2.7}],\"cvssMetricV2\":[{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"cvssData\":{\"version\":\"2.0\",\"vectorString\":\"AV:N/AC:M/Au:S/C:P/I:P/A:N\",\"baseScore\":4.9,\"accessVector\":\"NETWORK\",\"accessComplexity\":\"MEDIUM\",\"authentication\":\"SINGLE\",\"confidentialityImpact\":\"PARTIAL\",\"integrityImpact\":\"PARTIAL\",\"availabilityImpact\":\"NONE\"},\"baseSeverity\":\"MEDIUM\",\"exploitabilityScore\":6.8,\"impactScore\":4.9,\"acInsufInfo\":false,\"obtainAllPrivilege\":false,\"obtainUserPrivilege\":false,\"obtainOtherPrivilege\":false,\"userInteractionRequired\":true}]},\"weaknesses\":[{\"source\":\"jordan@liggitt.net\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-184\"}]},{\"source\":\"nvd@nist.gov\",\"type\":\"Primary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-601\"}]}],\"configurations\":[{\"nodes\":[{\"operator\":\"OR\",\"negate\":false,\"cpeMatch\":[{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.16.0\",\"versionEndExcluding\":\"1.18.19\",\"matchCriteriaId\":\"1B86E916-8D46-49BD-BF24-ED83D2ECFB28\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.19.0\",\"versionEndExcluding\":\"1.19.10\",\"matchCriteriaId\":\"54F99BEF-703E-43C0-846C-AB9EECE134A9\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*\",\"versionStartIncluding\":\"1.20.0\",\"versionEndExcluding\":\"1.20.7\",\"matchCriteriaId\":\"9649E8E5-DDA2-408F-9221-19E853704497\"},{\"vulnerable\":true,\"criteria\":\"cpe:2.3:a:kubernetes:kubernetes:1.21.0:-:*:*:*:*:*:*\",\"matchCriteriaId\":\"F9AF80B0-93B1-4129-BCB7-BF93F13FC880\"}]}]}],\"references\":[{\"url\":\"https://github.com/kubernetes/kubernetes/issues/102106\",\"source\":\"jordan@liggitt.net\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY\",\"source\":\"jordan@liggitt.net\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20211004-0004/\",\"source\":\"jordan@liggitt.net\",\"tags\":[\"Third Party Advisory\"]},{\"url\":\"https://github.com/kubernetes/kubernetes/issues/102106\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Patch\",\"Third Party Advisory\"]},{\"url\":\"https://groups.google.com/g/kubernetes-security-announce/c/xAiN3924thY\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Mailing List\",\"Third Party Advisory\"]},{\"url\":\"https://security.netapp.com/advisory/ntap-20211004-0004/\",\"source\":\"af854a3a-2127-422b-91ae-364da2661108\",\"tags\":[\"Third Party Advisory\"]}]}}",
   },
}


Log in or create an account to share your comment.

Security Advisory comment format.

This schema specifies the format of a comment related to a security advisory.

UUIDv4 of the comment
UUIDv4 of the Vulnerability-Lookup instance
When the comment was created originally
When the comment was last updated
Title of the comment
Description of the comment
The identifier of the vulnerability (CVE ID, GHSA-ID, PYSEC ID, etc.).



Tags
Taxonomy of the tags.


Loading…

Loading…

Loading…

Sightings

Author Source Type Date

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.