{
  "id": "CVE-2021-25737",
  "sourceIdentifier": "jordan@liggitt.net",
  "published": "2021-09-06T12:15:07.673",
  "lastModified": "2021-10-07T17:55:09.130",
  "vulnStatus": "Analyzed",
  "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 tr\u00e1fico del pod a redes privadas en un Nodo. Kubernetes ya previene la creaci\u00f3n de IPs de Endpoint en el rango localhost o link-local, pero no se ha llevado a cabo la misma comprobaci\u00f3n en las IPs de EndpointSlice."
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "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",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "REQUIRED",
          "scope": "CHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "LOW",
          "availabilityImpact": "NONE",
          "baseScore": 4.8,
          "baseSeverity": "MEDIUM"
        },
        "exploitabilityScore": 1.7,
        "impactScore": 2.7
      },
      {
        "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",
          "attackVector": "NETWORK",
          "attackComplexity": "LOW",
          "privilegesRequired": "HIGH",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "LOW",
          "integrityImpact": "NONE",
          "availabilityImpact": "NONE",
          "baseScore": 2.7,
          "baseSeverity": "LOW"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 1.4
      }
    ],
    "cvssMetricV2": [
      {
        "source": "nvd@nist.gov",
        "type": "Primary",
        "cvssData": {
          "version": "2.0",
          "vectorString": "AV:N/AC:M/Au:S/C:P/I:P/A:N",
          "accessVector": "NETWORK",
          "accessComplexity": "MEDIUM",
          "authentication": "SINGLE",
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "availabilityImpact": "NONE",
          "baseScore": 4.9
        },
        "baseSeverity": "MEDIUM",
        "exploitabilityScore": 6.8,
        "impactScore": 4.9,
        "acInsufInfo": false,
        "obtainAllPrivilege": false,
        "obtainUserPrivilege": false,
        "obtainOtherPrivilege": false,
        "userInteractionRequired": true
      }
    ]
  },
  "weaknesses": [
    {
      "source": "nvd@nist.gov",
      "type": "Primary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-601"
        }
      ]
    },
    {
      "source": "jordan@liggitt.net",
      "type": "Secondary",
      "description": [
        {
          "lang": "en",
          "value": "CWE-184"
        }
      ]
    }
  ],
  "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"
      ]
    }
  ]
}