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HackTheBox - Obscurity
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import sys | |
import random, string | |
import os | |
import time | |
import crypt | |
import traceback | |
import subprocess | |
path = ''.join(random.choices(string.ascii_letters + string.digits, k=8)) | |
session = {"user": "", "authenticated": 0} | |
try: | |
session['user'] = input("Enter username: ") | |
passW = input("Enter password: ") | |
with open('/etc/shadow', 'r') as f: | |
data = f.readlines() | |
data = [(p.split(":") if "$" in p else None) for p in data] | |
passwords = [] | |
for x in data: | |
if not x == None: | |
passwords.append(x) | |
passwordFile = '\n'.join(['\n'.join(p) for p in passwords]) | |
with open('/tmp/SSH/'+path, 'w') as f: | |
f.write(passwordFile) | |
time.sleep(.1) | |
salt = "" | |
realPass = "" | |
for p in passwords: | |
if p[0] == session['user']: | |
salt, realPass = p[1].split('$')[2:] | |
break | |
if salt == "": | |
print("Invalid user") | |
os.remove('/tmp/SSH/'+path) | |
sys.exit(0) | |
salt = '$6$'+salt+'$' | |
realPass = salt + realPass | |
hash = crypt.crypt(passW, salt) | |
if hash == realPass: | |
print("Authed!") | |
session['authenticated'] = 1 | |
else: | |
print("Incorrect pass") | |
os.remove('/tmp/SSH/'+path) | |
sys.exit(0) | |
os.remove(os.path.join('/tmp/SSH/',path)) | |
except Exception as e: | |
traceback.print_exc() | |
sys.exit(0) | |
if session['authenticated'] == 1: | |
while True: | |
command = input(session['user'] + "@Obscure$ ") | |
cmd = ['sudo', '-u', session['user']] | |
cmd.extend(command.split(" ")) | |
proc = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE) | |
o,e = proc.communicate() | |
print('Output: ' + o.decode('ascii')) | |
print('Error: ' + e.decode('ascii')) if len(e.decode('ascii')) > 0 else print('') |
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