CVE-2026-11106 – DNS Zone Transfer (AXFR) Information Disclosure

Program Code (Python DNS Server + Attack)

# dns_server_sim.py - Simulated DNS server allowing AXFR
from dnslib import DNSRecord, QTYPE, RR, TXT, A
import socketserver, socket

class DNSHandler(socketserver.BaseRequestHandler):
    def handle(self):
        data, sock = self.request
        request = DNSRecord.parse(data)
        reply = request.reply()
        qname = request.q.qname
        if request.q.qtype == QTYPE.AXFR:
            # Vulnerability: allows zone transfer from any client
            reply.add_answer(RR(qname, QTYPE.TXT, rdata=TXT("secret=admin:password123")))
            reply.add_answer(RR(qname, QTYPE.A, rdata=A("192.168.1.1")))
        sock.sendto(reply.pack(), self.client_address)

server = socketserver.ThreadingUDPServer(('0.0.0.0', 53), DNSHandler)
print("DNS server on :53")
server.serve_forever()

CVE-2026-11106 – Unrestricted DNS Zone Transfer (AXFR)

Overview

A misconfigured DNS server permits AXFR zone transfer requests from any IP address. This allows an attacker to enumerate all domain records, exposing internal IP addresses, service names, and sensitive TXT records.

Vulnerability Details

• Type: Information Disclosure
• Impact: Network mapping, credential leakage.
• Root Cause: The DNS server lacks access control for AXFR requests, which should be limited to trusted secondary servers.

Exploit Demonstration

1. Start the simulated DNS server:
   root@kitploit:~

   pip install dnslib dns
   sudo python dns_server_sim.py   # needs root for port 53
   

2. Run the exploit:
   root@kitploit:~

   python exploit_axfr.py