full-disclosure - Re: Drupal Help Injection Module XSS Vulnerability

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Date: Sat, 27 Feb 2010 23:49:15 +0000
From: Mori Sugimoto <foss@...sporan.net>
To: full-disclosure@...ts.grok.org.uk
Subject: Re: Drupal Help Injection Module XSS Vulnerability

This module is still in alpha and not considered suitable for any
production environment. Drupal Security Team does not deal with
vulnerability reports that are related to major releases or release
candidates. Instead we encourage reporters to contact the module
maintainers and fix any issue in the public issue queue. Please refer to
http://drupal.org/node/475848 for more detail.

Mori Sugimoto
Drupal Security Team



On 17/02/2010 16:29, Justin C. Klein Keane wrote:
> The full text of this advisory can also be found at
> http://www.madirish.net/?article=448
>
> Description of Vulnerability:
> -----------------------------
> Drupal (http://drupal.org) is a robust content management system (CMS)
> written in PHP and MySQL that provides extensibility through hundreds of
> third party modules.  The Advanced Help Injection and Export Module
> (http://drupal.org/project/helpinject) "assists you in writing help
> texts suitable for use with the Advanced Help module by allowing you to
> write your help texts in Drupal books."  The module suffers from an
> arbitrary HTML injection vulnerability.
>
> Systems affected:
> -----------------
> Drupal 6.15 using Advanced Help 6.x-1.2 and Help Inject 6.x-1.0-alpha6
> was tested and shown to be vulnerable.  The Advanced Help module is a
> dependency, but was not tested for vulnerability.
>
> Impact
> ------
> Attackers can exploit this vulnerability to escalate privilege and take
> control of the web server process.
>
> Mitigating factors:
> -------------------
> The Advanced Help and Help Inject modules must be installed and enabled.
>  Attacker must have 'create book content' permissions in order to
> exploit this vulnerability.  Only those with the 'inject help'
> permission are vulnerable, although this includes the site administrator.
>
> Proof of concept:
> -----------------
> 1.  Install Drupal 6.15.
> 2.  Install Book, Advanced Help and Help Inject and enable all
> functionality through Administer -> Modules
> 3.  Log in as uid 0 - the admin account
> 4.  Create a book using 'Create content' -> 'Book page'
> 5.  Fill in arbitrary values for the book title
> 6.  Expand the 'Book outline' form and select '<create a new book>' from
> the 'Book:' select
> 7.  Save the book using the 'Save' button
> 8.  Log out and log in as a user with 'create book content' privilege
> 9.  Click 'Create content' -> 'Book page'
> 10.  Enter "<script>alert('xss');</script>" for the 'Title:' area
> 11.  Expand the 'Book outline' fieldset
> 12.  Select the book created in step 5 from the 'Book:' select item
> 13.  Click the 'Save' button
> 14.  Log out and log in as a user with privileges to 'inject help'
> 15.  Click on any of the Help Inject icons (the little plus in a gray
> circle)
> 16.  Click the 'Next' button on the 'path granularity' screen
> 17.  Observe the JavaScript alert.
>

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_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/