#FCKeditor 2.6.10 Cross Site Scripting #XSS


Class  Cross-Site Scripting
Remote Yes
Published 2nd June 2014
Credit  Robin Bailey of Dionach (vulns@dionach.com)
Vulnerable FCKeditor <= 2.6.10

FCKeditor is prone to a reflected cross-site scripting (XSS) vulnerability due to inadequately sanitised user input. An attacker may leverage this issue to run JavaScript in the context of a victim's browser.

FCKeditor 2.6.10 is known to be vulnerable; older versions may also be vulnerable. 

Note that this issue is related to CVE-2012-4000, which was a cross-site scripting vulnerability in the values of the textinputs[] array passed to the spellchecker.php page. To resolve this issue the values of this array were encoded with htmlspecialchars() before being output to the page; however the array keys were still echoed unencoded.

PoC:

POST http://[target]/editor/dialog/fck_spellerpages/spellerpages/server-scripts/spellchecker.php
textinputs[1
]=zz The vendor was notified of this issue, and FCKeditor 2.6.11 was released to address this vulnerability. See the following vendor announcement: http://ckeditor.com/blog/FCKeditor-2.6.11-Released Timeline: 28/05/2014 Vulnerability identified 28/05/2014 Initial vendor contact 28/05/2014 Vendor response to contact 28/05/2014 Vulnerability disclosed to vendor 29/05/2014 Vendor confirms vulnerability 02/06/2014 Vendor releases patch 02/06/2014 Public disclosure of vulnerability ______________________________________________________________________ Disclaimer: This e-mail and any attachments are confidential. It may contain privileged information and is intended for the named addressee(s) only. It must not be distributed without Dionach Ltd consent. If you are not the intended recipient, please notify the sender immediately and destroy this e-mail. Any unauthorised copying, disclosure or distribution of the material in this e-mail is strictly forbidden. Unless expressly stated, opinions in this e-mail are those of the individual sender, and not of Dionach Ltd. Dionach Ltd, Greenford House, London Road, Wheatley, Oxford OX33 1JH Company Registration No. 03908168, VAT No. GB750661242 ______________________________________________________________________