cvelistv5 - CVE-2020-8562

CVE-2020-8562

Vulnerability from cvelistv5

Published
2022-02-01 10:33
Modified
2024-09-16 17:08
Severity ?
2.2 (Low) - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N
Summary
Bypass of Kubernetes API Server proxy TOCTOU
References
URL	Tags
jordan@liggitt.net	https://github.com/kubernetes/kubernetes/issues/101493	Issue Tracking, Mitigation, Third Party Advisory
jordan@liggitt.net	https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY	Mailing List, Third Party Advisory
jordan@liggitt.net	https://security.netapp.com/advisory/ntap-20220225-0002/	Third Party Advisory
Impacted products
▼	Vendor	Product
	Kubernetes	Kubernetes
Show details on NVD website
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{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2024-08-04T10:03:46.172Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://github.com/kubernetes/kubernetes/issues/101493"
          },
          {
            "tags": [
              "x_refsource_MISC",
              "x_transferred"
            ],
            "url": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY"
          },
          {
            "tags": [
              "x_refsource_CONFIRM",
              "x_transferred"
            ],
            "url": "https://security.netapp.com/advisory/ntap-20220225-0002/"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "Kubernetes",
          "vendor": "Kubernetes",
          "versions": [
            {
              "lessThanOrEqual": "v1.18.18",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "unknown",
              "version": "next of v1.18.18",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "v1.19.10",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "unknown",
              "version": "next of v1.19.10",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "v1.20.6",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "unknown",
              "version": "next of v1.20.6",
              "versionType": "custom"
            },
            {
              "lessThanOrEqual": "v1.21.0",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            },
            {
              "lessThan": "unspecified",
              "status": "unknown",
              "version": "next of v1.21.0",
              "versionType": "custom"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Javier Provecho"
        }
      ],
      "datePublic": "2021-05-04T00:00:00",
      "descriptions": [
        {
          "lang": "en",
          "value": "As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. If a non-standard DNS server returns different non-cached responses, a user may be able to bypass the proxy IP restriction and access private networks on the control plane."
        }
      ],
      "metrics": [
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            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 2.2,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-367",
              "description": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition",
              "lang": "en",
              "type": "CWE"
            }
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      ],
      "providerMetadata": {
        "dateUpdated": "2022-02-25T09:06:13",
        "orgId": "a6081bf6-c852-4425-ad4f-a67919267565",
        "shortName": "kubernetes"
      },
      "references": [
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          "tags": [
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          "url": "https://github.com/kubernetes/kubernetes/issues/101493"
        },
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        },
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          "tags": [
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          "url": "https://security.netapp.com/advisory/ntap-20220225-0002/"
        }
      ],
      "source": {
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        ],
        "discovery": "EXTERNAL"
      },
      "title": "Bypass of Kubernetes API Server proxy TOCTOU",
      "workarounds": [
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          "lang": "en",
          "value": "If this issue affects your clusters\u2019 control planes, you can use dnsmasq for name resolution and configure the min-cache-ttl and neg-ttl parameters to a low non-zero value to enforce cached replies for proxied connections"
        }
      ],
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      "x_legacyV4Record": {
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          "DATE_PUBLIC": "2021-05-04T16:51:00.000Z",
          "ID": "CVE-2020-8562",
          "STATE": "PUBLIC",
          "TITLE": "Bypass of Kubernetes API Server proxy TOCTOU"
        },
        "affects": {
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              {
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                    {
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                      "version": {
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                            "version_affected": "\u003c=",
                            "version_value": "v1.18.18"
                          },
                          {
                            "version_affected": "?\u003e",
                            "version_value": "v1.18.18"
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                          {
                            "version_affected": "\u003c=",
                            "version_value": "v1.19.10"
                          },
                          {
                            "version_affected": "?\u003e",
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                          {
                            "version_affected": "\u003c=",
                            "version_value": "v1.20.6"
                          },
                          {
                            "version_affected": "?\u003e",
                            "version_value": "v1.20.6"
                          },
                          {
                            "version_affected": "\u003c=",
                            "version_value": "v1.21.0"
                          },
                          {
                            "version_affected": "?\u003e",
                            "version_value": "v1.21.0"
                          }
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                      }
                    }
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                "vendor_name": "Kubernetes"
              }
            ]
          }
        },
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            "baseScore": 2.2,
            "baseSeverity": "LOW",
            "confidentialityImpact": "LOW",
            "integrityImpact": "NONE",
            "privilegesRequired": "HIGH",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:L/I:N/A:N",
            "version": "3.1"
          }
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        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "eng",
                  "value": "CWE-367 Time-of-check Time-of-use (TOCTOU) Race Condition"
                }
              ]
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            {
              "name": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY",
              "refsource": "MISC",
              "url": "https://groups.google.com/g/kubernetes-security-announce/c/-MFX60_wdOY"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20220225-0002/",
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              "url": "https://security.netapp.com/advisory/ntap-20220225-0002/"
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        },
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          "defect": [
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          ],
          "discovery": "EXTERNAL"
        },
        "work_around": [
          {
            "lang": "en",
            "value": "If this issue affects your clusters\u2019 control planes, you can use dnsmasq for name resolution and configure the min-cache-ttl and neg-ttl parameters to a low non-zero value to enforce cached replies for proxied connections"
          }
        ]
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a6081bf6-c852-4425-ad4f-a67919267565",
    "assignerShortName": "kubernetes",
    "cveId": "CVE-2020-8562",
    "datePublished": "2022-02-01T10:33:00.317144Z",
    "dateReserved": "2020-02-03T00:00:00",
    "dateUpdated": "2024-09-16T17:08:37.065Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2020-8562\",\"sourceIdentifier\":\"jordan@liggitt.net\",\"published\":\"2022-02-01T11:15:10.903\",\"lastModified\":\"2022-03-29T16:35:38.577\",\"vulnStatus\":\"Analyzed\",\"descriptions\":[{\"lang\":\"en\",\"value\":\"As mitigations to a report from 2019 and CVE-2020-8555, Kubernetes attempts to prevent proxied connections from accessing link-local or localhost networks when making user-driven connections to Services, Pods, Nodes, or StorageClass service providers. As part of this mitigation Kubernetes does a DNS name resolution check and validates that response IPs are not in the link-local (169.254.0.0/16) or localhost (127.0.0.0/8) range. Kubernetes then performs a second DNS resolution without validation for the actual connection. 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  }
}
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.
Action not permitted

CVE-2020-8562

Vulnerability from cvelistv5

gsd-2020-8562

Vulnerability from gsd

ghsa-qh36-44jv-c8xj

Vulnerability from github

Tags

Sightings

Nomenclature
