WP All Import < 3.7.3 - Admin+ Arbitrary File Upload to RCE

Description The plugin accepts all zip files and automatically extracts the zip file into a publicly accessible directory without sufficiently validating the extracted file type. This may allows high privilege users such as administrator to upload an executable file type leading to remote code execution.

PoC

1. Configure the Apache server with mod_include and mod_cgi enabled, and enable server-side includes: Options Includes AddType text/html .shtml AddOutputFilter INCLUDES .shtml 2. Create a zip file including a CSV file and a file shell.shtml with the following contents: 3. As a site administrator on a multisite instance, visit /wp-admin/admin.php?page=pmxi-admin-import 4. Click “Upload a file” and choose the zip file created previously. 5. View the response of the AJAX request to /wp-admin/admin.php?page=pmxi-admin-settings&action;=upload&_wpnonce=… to find the directory of the uploaded zip file. 6. Directly access shell.shtml (e.g. at https://example.com/wp-content/uploads/wpallimport/uploads/abc123/zipfilename/shell.shtml) to trigger the RCE.