[FD] Komento Joomla! component Persistent XSS

CVE Reference: CVE-2015-7324 Original advisory: http://ift.tt/1LddLnu Author: David Sopas @dsopas Komento is a Joomla! comment extension for articles and blogs in K2, EasyBlog, ZOO, Flexicontent, VirtueMart and redShop. @http://ift.tt/1wjZooW I found out that was possible to launch a Persistent XSS attack when adding a new comment using the WYSIWYG website and image buttons. This issue was critical in both environments - frontend and backoffice. In frontend when a user visited a page where the comment has a XSS attack it would be automatically affected. In the other side - the backoffice - when the admin checked the new comment it would be vulnerable to this attack and could get his account hijacked or something even more dangerous. What I did was to pass along the XSS vector in the [img] code and use the Javascript onload to run the exploit when image loads. Proof-of-concept using [img]: [img]http://ift.tt/1LddIIm" onload="prompt(1)[/img] Proof-of-concept using [url]: [url="http://ift.tt/1L12Eum" onmouseover="prompt(1)"]Your text to link[/url] In the [img] case this will reflect the following HTML (on the frontend): And... In the administrator area. This Joomla! component has lot’s of Google results and can affect a large number of innocent people. A victim just by visiting the page with a malicious comment will be affected. All versions prior to 2.0.5 are affected. Vendor already patched both security issues in the new version 2.0.5 - http://ift.tt/1LddLnw -David Sopas davidsopas.com @dsopas

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