CKFinder 2.3 & FCKEditor 2.6.8 SWF Cross Site Scripting

2012.11.13

Credit: Soroush Dalili

Risk: Low

Local: No

Remote: Yes

CVE: N/A

CWE: CWE-79

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

References:

http://ckfinder.com/demo

http://soroush.secproject.com/blog/2012/11/xss-by-uploadingincluding-a-swf-file/

See this note in RAW Version

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CKFinder 2.3 & FCKEditor 2.6.8 SWF Cross Site Scripting

References:

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