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Drupal Embedded Media Field XSS (Emaudio Contrib)
From: Justin Klein Keane <justin () madirish net>
Date: Thu, 09 Dec 2010 12:45:06 -0500
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Details of this disclosure are also available at http://www.madirish.net/?article=472 Description of Vulnerability: - ----------------------------- Drupal (http://drupal.org) is a robust content management system (CMS) written in PHP and MySQL. The Drupal Embedded Media Field module (http://drupal.org/project/emfield) "will create fields for content types that can be used to display video, image, and audio files from various third party providers" Unfortunately the Embedded Media Field module contains an arbitrary HTML injection vulnerability (also known as cross site scripting, or XSS) due to the fact that it fails to sanitize user supplied audio file paths and custom embed code. Systems affected: - ----------------- Drupal 6.19 with Embedded Media Field 6.x-1.25 and CCK 6.x-2.8 was tested and shown to be vulnerable Impact - ------ Users could inject arbitrary scripts into pages affecting other site users. This could result in administrative account compromise leading to web server process compromise. A more likely scenario would be for an attacker to inject hidden content (such as iframes, applets, or embedded objects) that would attack client browsers in an attempt to compromise site users' machines. This vulnerability could also be used to launch cross site request forgery (XSRF) attacks against the site that could have other unexpected consequences. Mitigating factors: - ------------------- In order to exploit this vulnerability the attacker must have the ability to edit content of a content type with an embedded media field. Proof of concept: - ----------------- 1. Install Drupal 6-19, CCK module, and Embedded Media Field module version 6.x-1.25 2. Enable the Content, Embedded Media Field, Embedded Audio Field modules from ?q=/admin/build/modules 3. Alter the default 'Story' content type at ?q=admin/content/node-type/story/fields 4. Add a 'New Field' in the form at the bottom of this page with the label 'audio' the field name 'field_audio' the type 'Embedded Audio' and the form element '3rd Party Aduio' then click the 'Save' button 5. Configure the new video field from ?q=admin/content/node-type/story/fields/field_video 6. Select all content providers for convenience and click 'Save field settings' button at the bottom of the form 7. Create a new piece of story content from ?q=node/add/story entering arbitrary values. 8. Enter "'/><script>alert('xss');</script><embed onshow='alert("foo");' src='http://traffic.libsyn.com/pauldotcom/PaulDotCom-SW-217pt2.mp3" in the 'audio:' text field 9. Click the 'Save' and observe the rendered JavaScript alert whenever the node is displayed Patch: - ------------------------------------------ Applying the following patch mitigates this issue in version 6.x-1.25 - --- emfield/contrib/emaudio/providers/custom_url.inc 2009-06-26 14:31:00.000000000 -0400 +++ emfield/contrib/emaudio/providers/custom_url.inc 2010-11-05 15:17:08.000000000 -0400 @@ -110,6 +110,7 @@ function emaudio_custom_url_rss($item, $ } function theme_emaudio_custom_url_flash($url = NULL, $width = 0, $height = 0, $field = NULL, $data = array(), $node = NULL, $autoplay = FALSE) { + $url=str_replace("'", '', $url); //this should be a URL validator instead // Display the audio using Flowplayer if it's available. if (module_exists('flowplayer')) { $config = array( Vendor Response - --------------- http://drupal.org/node/992924 - -- Justin Klein Keane http://www.MadIrish.net The digital signature on this message can be confirmed using the public key at http://www.madirish.net/gpgkey -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Fedora - http://enigmail.mozdev.org/ iPwEAQECAAYFAk0BFaEACgkQkSlsbLsN1gAcRAb/UI8b0S22tSsvwfimbi9mQSpr wkKheh8Z/b+GGrYSYMh94acQlHJsnIMwRxVK1VJrlYm/IJd4lYJ/B5ZAlRwPryqx K7POTeJSJ0zlOLaMkO6Gdblu0p8KmJEIglR8nU+R0+//wfBV4wmG5DuuV3k0v48l 1FC3rdmsBwup17wI7gXR5qc+Ck82p2oB90tiJHKwsfS55DTN3dfMFzL41E04GlsA rtf950j8Tutp4MsvRK+f5yIOiyyo/DzJWBa1CdZ5FjryBmuiMg1ianpCO9RD6DwH dqFte4LY8hztccAPXeI= =bVtj -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
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- Drupal Embedded Media Field XSS (Emaudio Contrib) Justin Klein Keane (Dec 09)