gsd-2020-8557
Vulnerability from gsd
Modified
2023-12-13 01:21
Details
The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.
Aliases
Aliases



{
  "GSD": {
    "alias": "CVE-2020-8557",
    "description": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.",
    "id": "GSD-2020-8557",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-8557.html",
      "https://access.redhat.com/errata/RHSA-2021:3915",
      "https://access.redhat.com/errata/RHSA-2020:3809",
      "https://access.redhat.com/errata/RHSA-2020:3808",
      "https://access.redhat.com/errata/RHSA-2020:3580",
      "https://access.redhat.com/errata/RHSA-2020:3579",
      "https://access.redhat.com/errata/RHSA-2020:3520",
      "https://access.redhat.com/errata/RHSA-2020:3519",
      "https://linux.oracle.com/cve/CVE-2020-8557.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-8557"
      ],
      "details": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail.",
      "id": "GSD-2020-8557",
      "modified": "2023-12-13T01:21:53.615552Z",
      "schema_version": "1.4.0"
    }
  },
  "namespaces": {
    "cve.org": {
      "CVE_data_meta": {
        "ASSIGNER": "security@kubernetes.io",
        "DATE_PUBLIC": "2020-07-15T00:00:00.000Z",
        "ID": "CVE-2020-8557",
        "STATE": "PUBLIC",
        "TITLE": "Kubernetes node disk Denial of Service by writing to container /etc/hosts"
      },
      "affects": {
        "vendor": {
          "vendor_data": [
            {
              "product": {
                "product_data": [
                  {
                    "product_name": "Kubernetes",
                    "version": {
                      "version_data": [
                        {
                          "version_affected": "\u003c",
                          "version_name": "1.18",
                          "version_value": "1.18.6"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "1.17",
                          "version_value": "1.17.9"
                        },
                        {
                          "version_affected": "\u003c",
                          "version_name": "1.16",
                          "version_value": "1.16.13"
                        },
                        {
                          "version_value": "1.15"
                        },
                        {
                          "version_value": "1.14"
                        },
                        {
                          "version_value": "1.13"
                        },
                        {
                          "version_value": "1.12"
                        },
                        {
                          "version_value": "1.11"
                        },
                        {
                          "version_value": "1.10"
                        },
                        {
                          "version_value": "1.9"
                        },
                        {
                          "version_value": "1.8"
                        },
                        {
                          "version_value": "1.7"
                        },
                        {
                          "version_value": "1.6"
                        },
                        {
                          "version_value": "1.5"
                        },
                        {
                          "version_value": "1.4"
                        },
                        {
                          "version_value": "1.3"
                        },
                        {
                          "version_value": "1.2"
                        },
                        {
                          "version_value": "1.1"
                        }
                      ]
                    }
                  }
                ]
              },
              "vendor_name": "Kubernetes"
            }
          ]
        }
      },
      "credit": [
        {
          "lang": "eng",
          "value": "Kebe Liu of DaoCloud"
        }
      ],
      "data_format": "MITRE",
      "data_type": "CVE",
      "data_version": "4.0",
      "description": {
        "description_data": [
          {
            "lang": "eng",
            "value": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail."
          }
        ]
      },
      "generator": {
        "engine": "Vulnogram 0.0.9"
      },
      "impact": {
        "cvss": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        }
      },
      "problemtype": {
        "problemtype_data": [
          {
            "description": [
              {
                "lang": "eng",
                "value": "CWE-400 Uncontrolled Resource Consumption"
              }
            ]
          }
        ]
      },
      "references": {
        "reference_data": [
          {
            "name": "https://github.com/kubernetes/kubernetes/issues/93032",
            "refsource": "CONFIRM",
            "url": "https://github.com/kubernetes/kubernetes/issues/93032"
          },
          {
            "name": "[Security Advisory] CVE-2020-8557: Node disk DOS by writing to container /etc/hosts",
            "refsource": "MLIST",
            "url": "https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ"
          },
          {
            "name": "https://security.netapp.com/advisory/ntap-20200821-0002/",
            "refsource": "CONFIRM",
            "url": "https://security.netapp.com/advisory/ntap-20200821-0002/"
          }
        ]
      },
      "source": {
        "discovery": "USER"
      }
    },
    "gitlab.com": {
      "advisories": [
        {
          "affected_range": "\u003cv1.16.13 || \u003e=v1.17.0 \u003cv1.17.9 || \u003e=v1.18.0 \u003cv1.18.6",
          "affected_versions": "All versions before 1.16.13, all versions starting from 1.17.0 before 1.17.9, all versions starting from 1.18.0 before 1.18.6",
          "cvss_v2": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-400",
            "CWE-937"
          ],
          "date": "2020-08-21",
          "description": "The `/etc/hosts` file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the `/etc/hosts` file, it could fill the storage space of the node and cause the node to fail.",
          "fixed_versions": [
            "v1.16.13",
            "v1.17.9",
            "v1.18.6"
          ],
          "identifier": "CVE-2020-8557",
          "identifiers": [
            "CVE-2020-8557"
          ],
          "not_impacted": "All versions starting from 1.16.13 before 1.17.0, all versions starting from v1.17.9 before v1.18.0, all versions startin from v1.18.6",
          "package_slug": "go/github.com/kubernetes/kubelet",
          "pubdate": "2020-07-23",
          "solution": "Upgrade to versions 1.16.13, 1.17.9, 1.18.6 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8557"
          ],
          "uuid": "d94d0cec-7394-4341-b127-aac8e07c79c9",
          "versions": [
            {
              "commit": {
                "sha": "151c1e40350fc26156093f2c0400eb4b60bb88e1",
                "tags": [
                  "kubernetes-1.17.0"
                ],
                "timestamp": "20191211003115"
              },
              "number": "v1.17.0"
            },
            {
              "commit": {
                "sha": "e54015b524d2efd26fc3fab5c2259e808d1d357d",
                "tags": [
                  "kubernetes-1.18.0"
                ],
                "timestamp": "20200326042227"
              },
              "number": "v1.18.0"
            },
            {
              "commit": {
                "sha": "95dded27a4045677ac882943855514319096c4d5",
                "tags": [
                  "kubernetes-1.16.13"
                ],
                "timestamp": "20200716002139"
              },
              "number": "v1.16.13"
            },
            {
              "commit": {
                "sha": "b0aaaa17b6b3f826a00ac196d007304ebf9b4d64",
                "tags": [
                  "kubernetes-1.17.9"
                ],
                "timestamp": "20200716002222"
              },
              "number": "v1.17.9"
            },
            {
              "commit": {
                "sha": "a6ba72d3025c835ddfdd437778cb9003eac3c1d0",
                "tags": [
                  "kubernetes-1.18.6"
                ],
                "timestamp": "20200716002306"
              },
              "number": "v1.18.6"
            }
          ]
        },
        {
          "affected_range": "\u003c1.16.13||\u003e=1.17.0 \u003c1.17.9||\u003e=1.18.0 \u003c1.18.6",
          "affected_versions": "All versions before 1.16.13, all versions starting from 1.17.0 before 1.17.9, all versions starting from 1.18.0 before 1.18.6",
          "cvss_v2": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
          "cvss_v3": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "cwe_ids": [
            "CWE-1035",
            "CWE-400",
            "CWE-937"
          ],
          "date": "2020-08-21",
          "description": "The Kubernetes kubelet component do not account for disk usage by a pod which writes to its own `/etc/hosts` file. The `/etc/hosts` file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the `/etc/hosts` file, it could fill the storage space of the node and cause the node to fail.",
          "fixed_versions": [
            "1.16.13",
            "1.17.9",
            "1.18.6"
          ],
          "identifier": "CVE-2020-8557",
          "identifiers": [
            "CVE-2020-8557"
          ],
          "not_impacted": "All versions starting from 1.16.13 before 1.17.0, all versions starting from 1.17.9 before 1.18.0, all versions starting from 1.18.6",
          "package_slug": "go/k8s.io/kubernetes/pkg/apis/apps/validation",
          "pubdate": "2020-07-23",
          "solution": "Upgrade to version 1.16.13, 1.17.9, 1.18.6 or above.",
          "title": "Uncontrolled Resource Consumption",
          "urls": [
            "https://nvd.nist.gov/vuln/detail/CVE-2020-8557"
          ],
          "uuid": "d3e4fe07-ce1a-40a1-8edc-148e09ecf36b"
        }
      ]
    },
    "nvd.nist.gov": {
      "configurations": {
        "CVE_data_version": "4.0",
        "nodes": [
          {
            "children": [],
            "cpe_match": [
              {
                "cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.18.6",
                "versionStartIncluding": "1.18.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.17.9",
                "versionStartIncluding": "1.17.0",
                "vulnerable": true
              },
              {
                "cpe23Uri": "cpe:2.3:a:kubernetes:kubernetes:*:*:*:*:*:*:*:*",
                "cpe_name": [],
                "versionEndExcluding": "1.16.13",
                "vulnerable": true
              }
            ],
            "operator": "OR"
          }
        ]
      },
      "cve": {
        "CVE_data_meta": {
          "ASSIGNER": "security@kubernetes.io",
          "ID": "CVE-2020-8557"
        },
        "data_format": "MITRE",
        "data_type": "CVE",
        "data_version": "4.0",
        "description": {
          "description_data": [
            {
              "lang": "en",
              "value": "The Kubernetes kubelet component in versions 1.1-1.16.12, 1.17.0-1.17.8 and 1.18.0-1.18.5 do not account for disk usage by a pod which writes to its own /etc/hosts file. The /etc/hosts file mounted in a pod by kubelet is not included by the kubelet eviction manager when calculating ephemeral storage usage by a pod. If a pod writes a large amount of data to the /etc/hosts file, it could fill the storage space of the node and cause the node to fail."
            }
          ]
        },
        "problemtype": {
          "problemtype_data": [
            {
              "description": [
                {
                  "lang": "en",
                  "value": "CWE-400"
                }
              ]
            }
          ]
        },
        "references": {
          "reference_data": [
            {
              "name": "https://github.com/kubernetes/kubernetes/issues/93032",
              "refsource": "CONFIRM",
              "tags": [
                "Issue Tracking",
                "Patch",
                "Third Party Advisory"
              ],
              "url": "https://github.com/kubernetes/kubernetes/issues/93032"
            },
            {
              "name": "[Security Advisory] CVE-2020-8557: Node disk DOS by writing to container /etc/hosts",
              "refsource": "MLIST",
              "tags": [
                "Mailing List",
                "Third Party Advisory"
              ],
              "url": "https://groups.google.com/g/kubernetes-security-announce/c/cB_JUsYEKyY/m/vVSO61AhBwAJ"
            },
            {
              "name": "https://security.netapp.com/advisory/ntap-20200821-0002/",
              "refsource": "CONFIRM",
              "tags": [
                "Third Party Advisory"
              ],
              "url": "https://security.netapp.com/advisory/ntap-20200821-0002/"
            }
          ]
        }
      },
      "impact": {
        "baseMetricV2": {
          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "LOW",
            "accessVector": "LOCAL",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 2.1,
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "vectorString": "AV:L/AC:L/Au:N/C:N/I:N/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 3.9,
          "impactScore": 2.9,
          "obtainAllPrivilege": false,
          "obtainOtherPrivilege": false,
          "obtainUserPrivilege": false,
          "severity": "LOW",
          "userInteractionRequired": false
        },
        "baseMetricV3": {
          "cvssV3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 3.6
        }
      },
      "lastModifiedDate": "2023-01-27T20:35Z",
      "publishedDate": "2020-07-23T17:15Z"
    }
  }
}


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  • 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.