Vulnerability in strategy11team Formidable Forms – Contact Form, Survey, Quiz, Payment, Calculator Form & Custom Form Builder

[ Description ]Official description

The Formidable Forms – WordPress Form Builder for Contact Forms, Calculators, Quizzes & More plugin for WordPress is vulnerable to Arbitrary Plugin Installation in all versions up to, and including, 6.35 via the 'file_url' parameter parameter. This is due to insufficient URL prefix validation in validate_url_is_in_s3_bucket() and a permission callback that relies solely on a shared token obtainable by any user with the delegable frm_view_forms capability, without checking install_plugins or activate_plugins capabilities. This makes it possible for authenticated attackers, with subscriber-level access and above, to install arbitrary plugins on the server. Exploitation additionally requires that the site is free-only (Formidable Pro is NOT installed).

[ Fixes ]Fixes and patches

No fix or interim patch is linked from our sources yet. Check the vendor references below and limit exposure of affected systems until a fix is available.

[ References ]References

• plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsCo…
• plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsCo…
• plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAddonsCo…
• plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/controllers/FrmAppContr…
• plugins.trac.wordpress.org/browser/formidable/tags/6.35/classes/helpers/FrmAppHelper.php
• plugins.trac.wordpress.org/changeset/3746820/formidable/trunk/classes/controllers/FrmAd…
• plugins.trac.wordpress.org/changeset
• www.wordfence.com/threat-intel/vulnerabilities/id/87661de6-e835-495e-9bd2-4d64b4718108