Lets All Love UART

Flag: ECW{Lain_L0v3_U4RT}

Challenge

Description

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Level 1 - Let's all love UART !

This challenge emulates an UART interface on a Lain router. Open both connections, interact as if it was real hardware.

• TX : Read only

• RX : Write only

Let's All Love Lain!

Challenge made by Eun0us from:

Ce challenge tourne sur un docker et n'est pas disponible

Solution

Il faut simplement se connecter en TCP sur le serveur.

• Le port TX sert à transmettre, donc on lira dessus

• Le port RX sert à lire, donc on transmettra dessus

J'ai fait une classe pour abstraire tout ça.

from pwn import remote, context

context.log_level = "critical"

HOST = "challenges.challenge-ecw.eu"
TX = 35057
RX = 35058


class UART:
    def __init__(self, host: str, tx: int, rx: int) -> None:
        self.tx = remote(host, tx)
        self.rx = remote(host, rx)

    def read_until(self, until: bytes, print_str=True) -> str:
        data = self.tx.recvuntil(until).decode()
        if print_str:
            print(data, end="")
        return data

    def write(self, data: str, print_str=True):
        if print_str:
            print(data)
        self.rx.sendline(data.encode())


uart = UART(HOST, TX, RX)
uart.read_until(b'\r\n> ')

uart.write("help")
uart.read_until(b'\r\n> ')

uart.write("flag")
uart.read_until(b'\r\n> ')

Welcome to LAIN-UART router!
Type 'help' for available commands.
Design by espilon
> help
Available commands:
help - show this help
whoami - show device name
show config - print router config
flag - Lain Love Flag

> flag
ECW{Lain_L0v3_U4RT}
>