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@JJTech0130
Created December 20, 2020 22:25
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Python script to beat the PicoCTF "based" challenge
#!/usr/bin/python3
import socket
class bcolors:
HEADER = '\033[95m'
OKBLUE = '\033[94m'
OKCYAN = '\033[96m'
OKGREEN = '\033[92m'
WARNING = '\033[93m'
FAIL = '\033[91m'
ENDC = '\033[0m'
BOLD = '\033[1m'
UNDERLINE = '\033[4m'
string = input(bcolors.OKBLUE + "Paste the netcat string here: ")
nc = string.split(" ")
# create an INET, STREAMing socket
s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
# now connect to the port
s.connect((nc[1], int(nc[2])))
def asciiDecode(string, base):
str_converted = ""
for char in string.split():
if char.isdigit():
str_converted += chr(int(char, base))
return str_converted
# Special case for hex because it can't seem to handle it the normal way ("OverflowError: Python int too large to convert to C int"?)
def asciiDecodeHex(string):
string = string.replace("Please give me the ", '').replace(" as a word.", '')
bytes_object = bytes.fromhex(string)
ascii_string = bytes_object.decode("ASCII")
return ascii_string
# Question 1
data = s.recv(1024).decode("utf-8")
data = data.splitlines()[2] # Throw out the garbage
data = asciiDecode(data,2)
s.send(data.encode("utf-8") + b"\n")
# Question 2
data = s.recv(1024).decode("utf-8")
data = data.splitlines()[0] # Throw out the garbage
data = asciiDecode(data,8)
s.send(data.encode("utf-8") + b"\n")
# Question 3
data = s.recv(1024).decode("utf-8")
data = data.splitlines()[0] # Throw out the garbage
data = asciiDecodeHex(data)
s.send(data.encode("utf-8") + b"\n\n")
data = s.recv(1024).decode("utf-8")
print(bcolors.OKGREEN + data + bcolors.ENDC)
s.close()
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