Redirection for Contact Form 7 <= 3.2.7 - Unauthenticated Arbitrary File Copy via move_file_to_upload

Vulnerability Description

The Redirection for Contact Form 7 plugin for WordPress is vulnerable to arbitrary file uploads due to missing file type validation in the 'move_file_to_upload' function in all versions up to, and including, 3.2.7. This makes it possible for unauthenticated attackers to copy arbitrary files on the affected site's server. If 'allow_url_fopen' is set to 'On', it is possible to upload a remote file to the server.

References

• https://www.wordfence.com/threat-intel/vulnerabilities/id/b249ec90-a364-4644-94fb-d42eb6cc4d9a?source=cve
• https://plugins.trac.wordpress.org/changeset/3423970/wpcf7-redirect
• https://plugins.trac.wordpress.org/browser/wpcf7-redirect/tags/3.2.7/classes/class-wpcf7r-save-files.php#L180