[Full-disclosure] Drupal 6 CCK Module XSS Vulnerability

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Vendor Notified: 05/18/09
Vendor Response: Karoly Negyesi of Drupal security denies issue exists.
Drupal security has responded to reports of CCK based XSS
vulnerabilities in past with http://drupal.org/node/372836, which
basically shirks the issue. Although a problem clearly exists, Drupal
seems unconcerned with fixing it, instead semantically hiding the
vulnerability behind a reclassification of permissions that appears only
in SA-CORE-2009-002 rather than in either the Drupal interface or
documentation.

Details of this report are also published at
http://lampsecurity.org/drupal-cck-xss-vulnerability

Description of Vulnerability:

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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 Drupal Content Creation Kit (CCK) is a module
that allows site maintainers to modify content types by associating
custom fields with specific content types. The Drupal CCK module
contains a vulnerability that could allow an authenticated attacker to
inject arbitrary script into administration screens for content types.
This could allow an attacker to issue a cross site scripting (XSS)
attack against Drupal users with elevated privilege levels.

Systems affected:

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Drupal 6.12 with CCK 6.x-2.2 was tested and shown to be vulnerable

Mitigating factors:

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CCK must be installed and enabled. Attacker must have 'administer
content types' permissions in order to exploit this vulnerability.

Proof of concept:

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1. Install Drupal 6.12.
2. Install CCK and enable all CCK functionality through dminister ->
   Modules
3. Click on Administer -> Content management -> Content types
4. Select a type and click the 'manage fields' operation
5. Click 'edit' to edit the node-type
6. Expand the 'Submission form settings' input area
7. Fill in "<script>alert('title');<;/script>" for the "Title field label"
8. Fill in "<script>alert('body');</script>" for the "Body field label"
9. Click 'Save content type'
10. Click Administer -> Content Management -> Content types
11. Click "manage fields" link for the type selected in #4 above
12. Observe two JavaScript alerts

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