Russ McRee has discovered some vulnerabilities in Pligg, which can be exploited by malicious people to conduct cross-site scripting and request forgery attacks.

1) Input passed via the "Referer" HTTP header to various scripts (e.g. admin/admin_config.php, admin/admin_modules.php, delete.php, editlink.php, submit.php, submit_groups.php, user_add_remove_links.php, and user_settings.php) 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.

2) The application allows users to perform certain actions via HTTP requests without performing any validity checks to verify the requests. This can be exploited to e.g. create an arbitrary user with administrative privileges if a logged-in administrative user visits a malicious web site.

The vulnerabilities are confirmed in version 1.0.2. Other versions may also be affected

NOTE: Two other weaknesses related to redirection to external sites were also confirmed.

Solution
Both vulnerabilities along with one of the redirection weaknesses are fixed in version 1.0.3.

Provided and/or discovered by
Reported by Russ McRee via Secunia.

Changelog
Further details available to Secunia VIM customers

Original Advisory
Pligg:
http://www.pligg.com/blog/775/pligg-cms-1-0-3-release/

HolisticInfoSec:
http://holisticinfosec.org/content/view/130/45/

Deep Links
Links available to Secunia VIM customers