David Sopas – Web Security Researcher

November 23, 2015 at 2:33 pm

DepositFiles ZeroClipboard.swf XSS

DepositFiles ZeroClipboard.swf XSS

DepositFiles is a file storage website and one of the most popular ones. They’re online since 2005 and recently they start using dfiles.eu domain instead of the depositfiles.com. They allow free accounts but they also have membership fees.

When searching Google for a old depositfiles mirror I found a bogus ZeroClipboard version that reflected in a flash-based XSS.
This vulnerability in ZeroClipboard is well-known since 2012 – so pretty old issue laying around in this popular file storage site.

Proof-of-concept:

http://static.dfiles.eu/flash/ZeroClipboard.swf?id=\%22))}catch(e){}if(!self.a)self.a=!prompt(document.domain)//&width&height

With these attack, malicious users could hijack users accounts, phishing, malware redirections and a lot more.

I guess this file was lost in their static.dfiles.eu webserver. Sometimes these old vulnerable files can cause a breach on security. So if you are a security administrator or webdeveloper don’t forget to clean up any unused/outdated files.

Timeline:
09-11-2015 I sent the security report to DepositFiles
10-11-2015 DepositFiles replied that they forwarded the message to the manager
17-11-2015 I tested again my PoC and stop working because the file was removed. I requested an update from DepositFiles
23-11-2015 No reply was given but the vulnerable file was deleted so… full disclosure

 

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