Frog Cms Cross-Site Request Forgery

An issue was discovered in /admin/?/user/add in Frog CMS 0.9.5. The application's add user functionality suffers from CSRF. A malicious user can craft an HTML page and use it to trick a victim into clicking on it; once executed, a malicious user will be created with admin privileges. This happens due to lack of an anti-CSRF token in state modification requests. (2018-03-31, CVE-2018-8908)

The absence of Anti-CSRF tokens may lead to a Cross-Site Request Forgery attack that can result in executing a specific application action as another logged in user, e.g. steal their account by changing their email and password or silently adding a new admin user account when executed from the administrator account.

The attacker may copy one of your web application forms, e.g. email/password change form.

The webpage will contain a form with the exact set of fields as the original application but with input values already provided and the submit button replaced with a Javascript code causing auto-submission. When the page is accessed the form will be immediately submitted and page contents replaced with a valid content or a redirect to your original application.

One of your application users who is already logged in can be then tricked to navigate to such malicious page e.g. by clicking a link in a phishing email, and the pre-populated form content will be submitted to your application like it would be submitted by your user.