FKIE_CVE-2021-25748

Vulnerability from fkie_nvd - Published: 2023-05-24 17:15 - Updated: 2026-06-17 03:42
Severity
7.6 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Summary
A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster.
References
jordan@liggitt.nethttps://github.com/kubernetes/ingress-nginx/issues/8686Issue Tracking, Mitigation, Vendor Advisory
jordan@liggitt.nethttps://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8Mailing List, Mitigation, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://github.com/kubernetes/ingress-nginx/issues/8686Issue Tracking, Mitigation, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8Mailing List, Mitigation, Vendor Advisory
Impacted products
Vendor Product Version
kubernetes ingress-nginx *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "Kubernetes ingress-nginx",
          "vendor": "Kubernetes",
          "versions": [
            {
              "lessThan": "1.2.1",
              "status": "affected",
              "version": "unspecified",
              "versionType": "custom"
            }
          ]
        }
      ],
      "source": "jordan@liggitt.net"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:kubernetes:ingress-nginx:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E43BDC85-F198-4126-B487-21F6C3667561",
              "versionEndExcluding": "1.2.1",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "A security issue was discovered in ingress-nginx where a user that can create or update ingress objects can use a newline character to bypass the sanitization of the `spec.rules[].http.paths[].path` field of an Ingress object (in the `networking.k8s.io` or `extensions` API group) to obtain the credentials of the ingress-nginx controller. In the default configuration, that credential has access to all secrets in the cluster."
    }
  ],
  "id": "CVE-2021-25748",
  "lastModified": "2026-06-17T03:42:23.740",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "LOW",
          "baseScore": 7.6,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:L",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 4.7,
        "source": "jordan@liggitt.net",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2021-25748",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-01-16T21:23:23.823577Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2023-05-24T17:15:09.253",
  "references": [
    {
      "source": "jordan@liggitt.net",
      "tags": [
        "Issue Tracking",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/kubernetes/ingress-nginx/issues/8686"
    },
    {
      "source": "jordan@liggitt.net",
      "tags": [
        "Mailing List",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Issue Tracking",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://github.com/kubernetes/ingress-nginx/issues/8686"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Mailing List",
        "Mitigation",
        "Vendor Advisory"
      ],
      "url": "https://groups.google.com/g/kubernetes-security-announce/c/avaRYa9c7I8"
    }
  ],
  "sourceIdentifier": "jordan@liggitt.net",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-20"
        }
      ],
      "source": "jordan@liggitt.net",
      "type": "Secondary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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