XSS vulnerability in swfupload in ExpressionEngine

Hello 3APA3A!

Here is information about Cross-Site Scripting vulnerability in swfupload in ExpressionEngine.

After publication of my advisory XSS vulnerability in web applications with swfupload: AionWeb, Magento, Liferay Portal, SurgeMail, symfony (http://securityvulns.ru/docs28761.html) and after consulting with me concerning vulnerability in swfupload in Magento, representatives of eBay and Magento made an investigation. And they stated, that there is no swfupload in default bundle of Magento. I've gave them a link to web site on Magento with this vulnerability and after investigation they stated that it was user fault, who put swf-file to his site by himself.

So I've made my own investigation and found that situation is completely different. This XSS hole is actually related to ExpressionEngine. Not to Magento, but to EE. And it's not site specific, because there are other sites with the same vulnerable swfupload in similar path (all on EE).

Confusion happened due to the fact, that the owner of the first site (where I've found swfupload) was using two CMS - Magento and EE, and the first admin panel which I've found (to identify CMS) was exactly Magento's one.

XSS (WASC-08):

http://site/themes/cp_themes/default/images/swfupload_f9.swf?movieName=%22]);}catch(e){}if(!self.a)self.a=!alert(document.cookie);//

The beginning of the path can be different: some sites has it in root, i.e. /themes/, and that site has it in "cms" folder, i.e. /cms/themes/.

Note, that this vulnerability is available only on small amount of sites - i.e. it's some rare bundle of EE (not default).

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua