Improper access control in Popup Maker - Popup Forms, Optins & More - CVE-2019-17574

Detailed vulnerability description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to calls which can be performed and require no authentication. A remote attacker can call any method which contains an action starting from "popmake_" or "pum_", execute functions which do not require arguments (e.g: PUM_Admin_Tools::sysinfo_download or PUM_Admin_Tools::sysinfo_display) and obtain information regarding WordPress Plugins (active/inactive), the Webserver Configuration, the PHP Configuration and more.

PoC:

1. curl http://www.your-domain-with-popup-maker.com/?pum_action=tools_page_tab_system_info
2. curl -v -d “popmake_action=popup_sysinfo&popmake-sysinfo=choose any content you like” -X POST http://www.your-domain-with-popup-maker.com/

How to mitigate CVE-2019-17574

Sources

• http://blog.redyops.com/wordpress-plugin-popup-maker/
• https://github.com/PopupMaker/Popup-Maker/blob/master/CHANGELOG.md