CK Finder version 2.3 and FCKEditor version 2.6.8 allow uploads of malicious swf files that can allow for cross site scripting attacks.
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The latest versions of CKFinder (2.3) and FCKEditor(2.6.8) are accepting SWF as a valid extension. As a result, it is possible to make a website vulnerable to an XSS attack by uploading a malicious SWF file.
Source: http://soroush.secproject.com/blog/2012/11/xss-by-uploadingincluding-a-swf-file/
This has been reported to the vendor today, but the swf file is public currently via my blog.
PoC:
Demo Link: http://ckfinder.com/demo
Result: http://ckfinder.com/userfiles/flash/Public%20Folder/XSSProject.swf?js=alert(document.domain)
Regards
Soroush Dalili
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