Multiple vulnerabilities have been discovered in Fork CMS, which can be exploited by malicious users to conduct script insertion attacks and by malicious people to conduct cross-site scripting and request forgery attacks.

1) The application allows users to perform certain actions via HTTP requests without performing proper validity checks to verify the requests. This can be exploited to e.g. delete a user or a web page when a logged-in administrative user visits a specially crafted web page.

2) Input passed via the "form_token" parameter to private/en/authentication, the "value", "name", "type", "module", "application", and "language" parameters to private/en/locale/edit, and the "position_1", "position_2", "position_3", and "position_4" parameters to private/en/extensions/edit_theme_template is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

3) Input passed via the "success_message" parameter to private/en/form_builder/edit is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when the malicious data is being viewed.

Successful exploitation of this vulnerability requires the "FormBuilder Edit" permissions.

4) Input passed via the "site_html_header" and "site_html_footer" parameters to private/en/settings/index is not properly sanitised before being used. This can be exploited to insert arbitrary HTML and script code, which will be executed in a user's browser session in context of an affected site when the malicious data is being viewed.

Successful exploitation of this vulnerability requires the "Settings Index" permissions.

5) Input passed via the "name" parameter to /private/en/locale/index is not properly sanitised before being returned to the user. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site.

The vulnerabilities are confirmed in version 3.3.0. Other versions may also be affected.

Solution
Do not browse untrusted sites or follow untrusted links while being logged-in to the application. Edit the source code to ensure that input is properly sanitised.

Provided and/or discovered by
1) Ivano Binetti.
2-4) Gjoko Krstic, Zero Science Lab.
5) High-Tech Bridge SA.

Changelog
Further details available in Customer Area

Original Advisory
Ivano Binetti:
http://ivanobinetti.blogspot.com/2012/02/forkcms-325-csrf-and-xss-0day.html

Zero Science Lab:
http://www.zeroscience.mk/en/vulnerabilities/ZSL-2012-5076.php

HTB23075:
https://www.htbridge.ch/advisory/HTB23075

Deep Links
Links available in Customer Area