Security advisory

{
  "id": "86684ac1483beff10bf37cba2c10b6e93a5d24e3eb36f74293d2ebf94f5360a5",
  "url": "https://osv.dev/vulnerability/CVE-2018-20321",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "CVE-2018-20321",
    "summary": "An issue was discovered in Rancher 2 through 2.1.5. Any project member with access to the default namespace can mount the netes-default service account in a pod, and then use that pod to execute administrative privileged commands against the k8s cluster. This could be mitigated by isolating the default namespace in a separate project, where only cluster admins can be given permissions to access. As of 2018-12-20, this bug affected ALL clusters created or imported by Rancher.",
    "evidence": "osv:CVE-2018-20321",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2018-20321",
      "aliases": [
        "CVE-2018-20321",
        "GHSA-9qq2-xhmc-h9qr",
        "GO-2022-0644"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/rancher/rancher",
              "type": "GIT",
              "events": [
                {
                  "introduced": "14c6b3e8f903814c1bb9364187fb8193e33e7a82"
                },
                {
                  "last_affected": "27809385301fa082700a62ed819735f67e243852"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "cpe": "cpe:2.3:a:suse:rancher:*:*:*:*:*:*:*:*",
                    "range": [
                      {
                        "introduced": "2.0.0"
                      },
                      {
                        "last_affected": "2.1.5"
                      }
                    ],
                    "source": "CPE_RANGE"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v2.1.5",
            "v2.1.5-rc4",
            "v2.1.5-rc3",
            "v2.1.5-rc2",
            "v2.1.5-rc1",
            "v2.1.4",
            "v2.1.4-rc2",
            "v2.1.4-rc1",
            "v2.1.3-rc3",
            "v2.1.3",
            "v2.1.3-rc2",
            "v2.1.3-rc1",
            "v2.1.2-rc17",
            "v2.1.2",
            "v2.1.2-rc16",
            "v2.1.2-rc15",
            "v2.1.2-rc14",
            "v2.1.2-rc13",
            "v2.1.2-rc12",
            "v2.1.2-rc11",
            "v2.1.2-rc10",
            "v2.1.2-rc9",
            "v2.1.2-rc8",
            "v2.1.2-rc7",
            "v2.1.2-rc6",
            "v2.1.2-rc5",
            "v2.1.2-rc4",
            "v2.1.2-rc3",
            "v2.1.2-rc2",
            "v2.1.2-rc1",
            "v2.1.1-rc7",
            "v2.1.1",
            "v2.1.1-rc6",
            "v2.1.1-rc5",
            "v2.1.1-rc4",
            "v2.1.1-rc3",
            "v2.1.1-rc2",
            "v2.1.1-rc1",
            "v2.1.0",
            "v2.1.0-rc10",
            "v2.1.0-rc9",
            "v2.1.0-rc8",
            "v2.1.0-rc7",
            "v2.1.0-rc6",
            "v2.1.0-rc5",
            "v2.1.0-rc4",
            "v2.1.0-rc3",
            "v2.1.0-rc2",
            "v2.1.0-rc1",
            "v2.0.8-rc2",
            "v2.0.7-rc6",
            "v2.0.7",
            "v2.0.7-rc5",
            "v2.0.7-rc4",
            "v2.0.7-rc3",
            "v2.0.7-rc2",
            "v2.0.7-rc1",
            "v2.0.6-rc2",
            "v2.0.6",
            "v2.0.6-rc1",
            "v2.0.5",
            "v2.0.5-rc6",
            "v2.0.5-rc5",
            "v2.0.5-rc4",
            "v2.0.5-rc3",
            "v2.0.5-rc2",
            "v2.0.5-rc1",
            "v2.0.4-rc1",
            "v2.0.4",
            "v2.0.3-rc5",
            "v2.0.3",
            "v2.0.3-rc4",
            "v2.0.3-rc3",
            "v2.0.3-rc2",
            "v2.0.3-rc1",
            "v2.0.2-rc1",
            "v2.0.2",
            "v2.0.1",
            "v2.0.1-rc6",
            "v2.0.1-rc5",
            "v2.0.1-rc4",
            "v2.0.1-rc3",
            "v2.0.1-rc2",
            "v2.0.1-rc1",
            "v2.0.0-rc5",
            "v2.0.0"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2018-20321.json"
          }
        }
      ],
      "modified": "2026-10-24T10:30:35.909954578Z",
      "provider": "osv",
      "references": [
        "https://forums.rancher.com/c/announcements",
        "https://rancher.com/blog/2019/2019-01-29-explaining-security-vulnerabilities-addressed-in-rancher-v2-1-6-and-v2-0-11/"
      ],
      "provider_metadata": {}
    },
    "related_cves": [
      {
        "value": "CVE-2018-20321",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 433863,
  "published_at": "2019-04-10T14:29:00.267+00:00"
}