FKIE_CVE-2021-31999

Vulnerability from fkie_nvd - Published: 2021-07-15 09:15 - Updated: 2026-06-17 03:52
Severity
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.8 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the "Impersonate-User" or "Impersonate-Group" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16.
References
meissner@suse.dehttps://bugzilla.suse.com/show_bug.cgi?id=1187084Issue Tracking, Release Notes, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://bugzilla.suse.com/show_bug.cgi?id=1187084Issue Tracking, Release Notes, Third Party Advisory
Impacted products
Vendor Product Version
rancher rancher *
rancher rancher *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Rancher",
          "vendor": "Rancher",
          "versions": [
            {
              "lessThan": "2.5.9",
              "status": "affected",
              "version": "Rancher",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "SUSE Linux Enterprise Server 15",
          "vendor": "Rancher",
          "versions": [
            {
              "lessThan": "2.4.16",
              "status": "affected",
              "version": "Rancher",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "meissner@suse.de"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:rancher:rancher:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "61F2398D-29ED-4CD4-A229-186EF99BB4E8",
              "versionEndExcluding": "2.4.16",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:a:rancher:rancher:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "67B096D9-719A-43C1-8B49-AF0C09A30715",
              "versionEndExcluding": "2.5.9",
              "versionStartIncluding": "2.5.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A Reliance on Untrusted Inputs in a Security Decision vulnerability in Rancher allows users in the cluster to act as others users in the cluster by forging the \"Impersonate-User\" or \"Impersonate-Group\" headers. This issue affects: Rancher versions prior to 2.5.9. Rancher versions prior to 2.4.16."
    },
    {
      "lang": "es",
      "value": "Una vulnerabilidad de Dependencia de Datos no Confiables en una Decisi\u00f3n de Seguridad en Rancher permite a usuarios del cluster actuar como otros usuarios del cluster al falsificar los encabezados \"Impersonate-User\" o \"Impersonate-Group\". Este problema afecta a: Rancher versiones anteriores a 2.5.9. Rancher versiones anteriores a 2.4.16"
    }
  ],
  "id": "CVE-2021-31999",
  "lastModified": "2026-06-17T03:52:39.060",
  "metrics": {
    "cvssMetricV2": [
      {
        "acInsufInfo": false,
        "baseSeverity": "MEDIUM",
        "cvssData": {
          "accessComplexity": "LOW",
          "accessVector": "NETWORK",
          "authentication": "SINGLE",
          "availabilityImpact": "PARTIAL",
          "baseScore": 6.5,
          "confidentialityImpact": "PARTIAL",
          "integrityImpact": "PARTIAL",
          "vectorString": "AV:N/AC:L/Au:S/C:P/I:P/A:P",
          "version": "2.0"
        },
        "exploitabilityScore": 8.0,
        "impactScore": 6.4,
        "obtainAllPrivilege": false,
        "obtainOtherPrivilege": false,
        "obtainUserPrivilege": false,
        "source": "nvd@nist.gov",
        "type": "Primary",
        "userInteractionRequired": false
      }
    ],
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "meissner@suse.de",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 8.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2021-07-15T09:15:08.210",
  "references": [
    {
      "source": "meissner@suse.de",
      "tags": [
        "Issue Tracking",
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1187084"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Release Notes",
        "Third Party Advisory"
      ],
      "url": "https://bugzilla.suse.com/show_bug.cgi?id=1187084"
    }
  ],
  "sourceIdentifier": "meissner@suse.de",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-807"
        }
      ],
      "source": "meissner@suse.de",
      "type": "Secondary"
    }
  ]
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

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  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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