Kubernetes Ingress-Nginx Valid AdmissionReview - Detection

ID: ingress-nginx-valid-admission

Severity: unknown

Author: burso

Tags: tech,kubernetes,ingress,nginx,k8s

Description

Sends a valid minimal AdmissionReview JSON to reliably detect Kubernetes Ingress-Nginx Admission webhook endpoints.

YAML Source

id: ingress-nginx-valid-admission

info:
  name: Kubernetes Ingress-Nginx Valid AdmissionReview - Detection
  author: burso
  severity: unknown
  description: |
    Sends a valid minimal AdmissionReview JSON to reliably detect Kubernetes Ingress-Nginx Admission webhook endpoints.
  metadata:
    verified: true
    max-request: 1
    shodan-query: ssl:"ingress-nginx" port:8443
  tags: tech,kubernetes,ingress,nginx,k8s

variables:
  string: "{{to_lower(rand_base(5))}}"

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

        {
          "kind": "AdmissionReview",
          "apiVersion": "admission.k8s.io/v1",
          "request": {
            "uid": "{{string}}",
            "kind": {
              "group": "networking.k8s.io",
              "version": "v1",
              "kind": "Ingress"
            },
            "operation": "CREATE",
            "object": {
              "metadata": {
                "name": "test-{{string}}",
                "namespace": "default"
              },
              "spec": {
                "rules": [
                  {
                    "host": "example.com",
                    "http": {
                      "paths": []
                    }
                  }
                ]
              }
            }
          }
        }

    matchers:
      - type: word
        part: body
        words:
          - 'AdmissionReview'
          - 'response'
          - 'test-{{string}}'
        condition: and
# digest: 4a0a00473045022100f046eccecf7c48210876e2ecad64811734871bc64ac08cc986e15e3183660a15022043d084460c8fbbb96edfd16e7278547daaf5d7d31d85d97fd7bcbade657fdb0e:922c64590222798bb761d5b6d8e72950

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.

$ nuclei -u "URL" -t "http/misconfiguration/ingress-nginx-valid-admission.yaml"

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