full-disclosure - Drupal Service Links 6.x-1.0 XSS Vulnerability

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Date: Fri, 02 Oct 2009 10:42:49 -0400
From: Justin Klein Keane <justin@...irish.net>
To: full-disclosure@...ts.grok.org.uk
Subject: Drupal Service Links 6.x-1.0 XSS Vulnerability

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Description of Vulnerability:
- - - -----------------------------
Drupal (http://drupal.org) is a robust content management system (CMS)
written in PHP and MySQL that provides extensibility through various
third party modules.  The Service links module
(http://drupal.org/project/service_links) "enables admins to add links
to a number of social bookmarking sites, blog search sites etc. "

The Service Links module contains a cross site scripting vulnerability
because it does not properly sanitize output of content type names
before display.

Systems affected:
- - - -----------------
Drupal 6.14 with Service links 6.x-1.0 was tested and shown to be
vulnerable.

Impact:
- - - -------
XSS vulnerabilities may expose site administrative accounts to
compromise which could lead to web server process compromise.

Mitigating factors:
- - - -------------------
The Service links module must be installed.  To carry out a Service
links based XSS exploit the attacker must have 'administer content
types' permissions.

Proof of Concept:
- - ---------------------
1.  Install Drupal 6.14
2.  Install Service links 6.x-1.0
3.  Enable the Service links module from Administer -> Site building ->
Modules
4.  Create a new Content type from Administer -> Content management ->
Content types and click 'Add content type'
5.  For the 'name' field enter "<script>alert('xss');</script>" and save
the content type
6.  Click Administer -> Site configuration -> Service links to trigger
the JavaScript

Technical details:
- - ------------------------
The Service links module fails to sanitize the output of the content
type names before display.  Applying the following patch fixes this
vulnerability.

Patch
- - -------
Applying the following patch mitigates these threats.

- --- service_links/service_links.module	2008-02-26 12:01:27.000000000 -0500
+++ service_links_fixed/service_links.module	2009-10-02
06:33:21.000000000 -0400
@@ -35,11 +35,12 @@ function service_links_admin_settings()
     '#title' => t('Where to show the service links'),
     '#description' => t('Set the node types and categories you want to
display links for.'),
   );
+  $names = array_map('filter_xss', node_get_types('names'));
   $form['where_to_show_the_links']['service_links_node_types'] = array(
     '#type' => 'checkboxes',
     '#title' => t('Node types'),
     '#default_value' => variable_get('service_links_node_types', array()),
- -    '#options' => node_get_types('names'),
+    '#options' => $names,
   );
   if (module_exists('taxonomy')) {
     $form['where_to_show_the_links']['service_links_category_types'] =
array(

- --

Justin C. Klein Keane
http://www.MadIrish.net
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