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CKFinder 2.3 / FCKEditor 2.6.8 SWF Cross Site Scripting

CKFinder 2.3 / FCKEditor 2.6.8 SWF Cross Site Scripting
Posted Nov 12, 2012
Authored by Soroush Dalili

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.

tags | exploit, xss
MD5 | 2eda3301d34b7c61132c342d69a71c9b

CKFinder 2.3 / FCKEditor 2.6.8 SWF Cross Site Scripting

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Hello
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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