ghsa-f4p5-x4vc-mh4v
Vulnerability from github
Published
2022-10-19 18:40
Modified
2024-05-20 21:35
Severity ?
5.0 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L
Summary
Improper use of metav1.Duration allows for Denial of Service
Details

Flux controllers within the affected versions range are vulnerable to a denial of service attack. Users that have permissions to change Flux’s objects, either through a Flux source or directly within a cluster, can provide invalid data to fields .spec.interval or .spec.timeout (and structured variations of these fields), causing the entire object type to stop being processed.

The issue has two root causes: a) the Kubernetes type metav1.Duration not being fully compatible with the Go type time.Duration as explained on upstream report; b) lack of validation within Flux to restrict allowed values.

Workarounds

Admission controllers can be employed to restrict the values that can be used for fields .spec.interval and .spec.timeout, however upgrading to the latest versions is still the recommended mitigation.

Credits

This issue was reported by Alexander Block (@codablock) through the Flux security mailing list (as recommended).

For more information

If you have any questions or comments about this advisory:

  • Open an issue in any of the affected repositories.
  • Contact us at the CNCF Flux channel.

References

  • https://github.com/kubernetes/apimachinery/issues/131
Show details on source website

To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/flux2"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.35.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/source-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.1-alpha-1"
            },
            {
              "fixed": "0.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/kustomize-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.1-alpha-1"
            },
            {
              "fixed": "0.29.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/helm-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.1-alpha-1"
            },
            {
              "fixed": "0.24.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/notification-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.0.1-alpha-1"
            },
            {
              "fixed": "0.27.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/image-automation-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.26.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/image-reflector-controller"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.1.0"
            },
            {
              "fixed": "0.22.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/helm-controller/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.26.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/image-automation-controller/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.26.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/image-reflector-controller/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.22.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/kustomize-controller/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/notification-controller/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.28.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/fluxcd/source-controller/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.30.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-39272"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-20"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-10-19T18:40:02Z",
    "nvd_published_at": "2022-10-22T00:15:00Z",
    "severity": "MODERATE"
  },
  "details": "Flux controllers within the affected versions range are vulnerable to a denial of service attack. Users that have permissions to change Flux\u2019s objects, either through a Flux source or directly within a cluster, can provide invalid data to fields `.spec.interval` or `.spec.timeout` (and structured variations of these fields), causing the entire object type to stop being processed.\n\nThe issue has two root causes: a) the Kubernetes type `metav1.Duration` not being fully compatible with the Go type `time.Duration` as explained on [upstream report](https://github.com/kubernetes/apimachinery/issues/131); b) lack of validation within Flux to restrict allowed values.\n\n### Workarounds\n\nAdmission controllers can be employed to restrict the values that can be used for fields `.spec.interval` and `.spec.timeout`, however upgrading to the latest versions is still the recommended mitigation.\n\n### Credits\n\nThis issue was reported by Alexander Block (@codablock) through the Flux security mailing list (as [recommended](https://fluxcd.io/security/#report-a-vulnerability)).\n\n### For more information\n\nIf you have any questions or comments about this advisory:\n\n- Open an issue in any of the affected repositories.\n- Contact us at the CNCF Flux channel.\n\n### References\n\n- https://github.com/kubernetes/apimachinery/issues/131\n\n",
  "id": "GHSA-f4p5-x4vc-mh4v",
  "modified": "2024-05-20T21:35:10Z",
  "published": "2022-10-19T18:40:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/flux2/security/advisories/GHSA-f4p5-x4vc-mh4v"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-39272"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubernetes/apimachinery/issues/131"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/helm-controller/pull/533"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/image-automation-controller/pull/439"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/image-reflector-controller/pull/314"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/kustomize-controller/pull/731"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/notification-controller/pull/420"
    },
    {
      "type": "WEB",
      "url": "https://github.com/fluxcd/source-controller/pull/903"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/fluxcd/flux2"
    },
    {
      "type": "WEB",
      "url": "https://github.com/kubernetes/apimachinery#131"
    },
    {
      "type": "WEB",
      "url": "https://pkg.go.dev/vuln/GO-2022-1071"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:L",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Improper use of metav1.Duration allows for Denial of Service"
}


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