About Source code There is a python script listening on port 10007 that contains a vulnerability. To do this level, log in as the level17 account with the password level17. Files for this level can be found in /home/flag17. #!/usr/bin/python

import os import pickle import time import socket import signal

signal.signal(signal.SIGCHLD, signal.SIG_IGN)

def server(skt): line = skt.recv(1024)

obj = pickle.loads(line)

for i in obj: clnt.send(“why did you send me " + i + “?\n”)

skt = socket.socket(socket.AF_INET, socket.SOCK_STREAM, 0) skt.bind((‘0.0.0.0’, 10007)) skt.listen(10)

while True: clnt, addr = skt.accept()

if(os.fork() == 0): clnt.send(“Accepted connection from %s:%d” % (addr[0], addr[1])) server(clnt) exit(1)