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--[ 7 - Give this a try yourself!
* Turn off the WR940Nv6
* Connect a serial adapter to the UART pins
* Note: There are two jumpers that need to be soldered to complete the
circuit for RX/TX
* Run the script below to drop the WR940Nv6 into the Das U-Boot shell
* Turn on the Router via the button on the back of the router
* Note: If the script doesn't detect a shell within a few seconds then
reboot the router and it should work
* Connect to port TCP port 1337 once the script detects a Das U-boot shell
* Send the string `w0x18040008 0x00080000` to turn the front LED blue
* Send the string `w0x18040008 0x00004000` to turn off the front LED
* Send `shutdown` to close the server socket and exit
* MMIO MITM Python Code:
```
import serial
import time
import socket
import logging
### CONSTS ###
GPIO_OUT = 0x18040008
logger = logging.getLogger(__name__)
logging.basicConfig(filename='bootup.log',
format='"%(asctime)s;%(message)s',
datefmt="%H:%M:%S", filemode='w',
encoding='utf-8', level=logging.DEBUG)
def get_response(ser):
time.sleep(0.02)
out = b""
while ser.inWaiting() > 0:
out += ser.read(1)
return out
def read_from_phy_memory(ser, address):
print(f'[*] Reading from Address: 0x{address:08X}...')
ser.write(bytes(f"md 0x{address:08X} 1\n","UTF-8"))
out = get_response(ser)
offset = out.rfind(bytes(f'{address:08x}: ',"UTF-8"))
value = int(b'0x' + out[offset + len(bytes(f'{address:08x}: ',
"UTF-8")):offset + len(bytes(f'{address:08x}: ',"UTF-8")) + 8], 16)
logging.debug(f"READ: 0x{address:08X}: 0x{value:08X}")
return value
def write_to_phy_memory(ser, address, value):
print(f'[*] Writing to Address: 0x{address:08X} with value \
0x{value:08X}...')
logging.debug(f"WRITE: 0x{address:08X}: 0x{value:08X}")
ser.write(bytes(f"mw 0x{address:04X} 0x{value:04X}\n","UTF-8"))
time.sleep(0.01)
def test_uboot_cmd_line(ser, test_string):
ser.write(bytes(f"{test_string}\n","UTF-8"))
out = get_response(ser)
if bytes(f'Unknown command \'{test_string}\'', "UTF-8") in out:
return True
def spam_tpl_for_uboot(ser, max_attempts):
while True:
ser.write(b'tpl')
out = get_response(ser)
if b"ap151>" in out:
print(f"[+] Router is now in [REDACTED] state with \
{max_attempts} attempts remaining.")
return True
max_attempts -= 1
if max_attempts == 0:
print("[-] Unable to get the router into the [REDACTED] state. \
Try Rebooting...")
return False
def listen_and_respond(ser, port):
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
s.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
try:
s.bind(("0.0.0.0", port))
except socket.error as msg:
print('[-] Bind failed. Error Code : ' + str(msg[0]) + \
' Message ' + msg[1])
return False
s.listen(1)
print (f'[*] Socket now listening on port {port}')
while True:
conn, addr = s.accept()
msg = conn.recv(1024)
while len(msg) > 0:
if msg == b'exit\n':
conn.send(bytes('[*] Byeeeeee\n', "UTF-8"))
conn.close()
break
if msg == b'shutdown\n':
conn.send(bytes('[*] The server is going down down\n',
"UTF-8"))
conn.close()
s.shutdown(socket.SHUT_WR)
s.close()