fkie_cve-2021-25735
Vulnerability from fkie_nvd
Published
2021-09-06 12:15
Modified
2024-11-21 05:55
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H
Summary
A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields.
References
jordan@liggitt.nethttps://github.com/kubernetes/kubernetes/issues/100096Patch, Third Party Advisory
jordan@liggitt.nethttps://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9YMailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/kubernetes/kubernetes/issues/100096Patch, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9YMailing List, Third Party Advisory
Impacted products
Vendor Product Version
kubernetes kubernetes *
kubernetes kubernetes *
kubernetes kubernetes *


To clipboard 

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "2CBC03B5-FF1D-45D7-A8F9-288DF2057568",
              "versionEndExcluding": "1.18.18",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "54F99BEF-703E-43C0-846C-AB9EECE134A9",
              "versionEndExcluding": "1.19.10",
              "versionStartIncluding": "1.19.0",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E26E82C1-754C-4E81-B7BC-FB4DACE33945",
              "versionEndExcluding": "1.20.6",
              "versionStartIncluding": "1.20.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security issue was discovered in kube-apiserver that could allow node updates to bypass a Validating Admission Webhook. Clusters are only affected by this vulnerability if they run a Validating Admission Webhook for Nodes that denies admission based at least partially on the old state of the Node object. Validating Admission Webhook does not observe some previous fields."
    },
    {
      "lang": "es",
      "value": "Se ha detectado un problema de seguridad en kube-apiserver que podr\u00eda permitir a las actualizaciones de los nodos omitir un Validating Admission Webhook. Los clusters s\u00f3lo est\u00e1n afectados por esta vulnerabilidad si ejecutan un Validating Admission Webhook para nodos que deniega la admisi\u00f3n bas\u00e1ndose, al menos parcialmente, en el estado antiguo del objeto Node. El Validating Admission Webhook no comprueba algunos campos anteriores."
    }
  ],
  "id": "CVE-2021-25735",
  "lastModified": "2024-11-21T05:55:19.043",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 5.5,
          "confidentialityImpact": "NONE",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:S/C:N/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 4.9,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.2,
        "source": "jordan@liggitt.net",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "HIGH",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.2,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-09-06T12:15:07.617",
  "references": [
    {
      "source": "jordan@liggitt.net",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/kubernetes/kubernetes/issues/100096"
    },
    {
      "source": "jordan@liggitt.net",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch",
        "Third Party Advisory"
      ],
      "url": "https://github.com/kubernetes/kubernetes/issues/100096"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Third Party Advisory"
      ],
      "url": "https://groups.google.com/g/kubernetes-security-announce/c/FKAGqT4jx9Y"
    }
  ],
  "sourceIdentifier": "jordan@liggitt.net",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-372"
        }
      ],
      "source": "jordan@liggitt.net",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-Other"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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