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Date: Sat, 15 Mar 2014 05:11:31 +0000
From: "Nicholas Lemonias." <lem.nikolas@...glemail.com>
To: full-disclosure@...ts.grok.org.uk, Michal Zalewski <lcamtuf@...edump.cx>
Subject: Re: Fwd: Google vulnerabilities with PoC

Correct.

The mime type can be circumvented. We can confirm this to be a valid
vulnerability.

For the PoC's :

http://news.softpedia.com/news/Expert-Finds-File-Upload-Vulnerability-in-YouTube-Google-Denies-It-s-a-Security-Issue-431489.shtml

On Fri, Mar 14, 2014 at 8:40 PM, Krzysztof Kotowicz
<kkotowicz+fd@...il.com>wrote:

>
> 2014-03-14 20:28 GMT+01:00 Nicholas Lemonias. <lem.nikolas@...glemail.com>
> :
>
> Then that also means that firewalls and IPS systems are worthless. Why
>> spend so much time protecting the network layers if a user can send any
>> file of choice to a remote network through http...
>>
>
> No, they are not worthless per se, but of course for an user content
> publishing service they need to allow file upload over HTTP/s. How far
> those files are inspected and later processed is another question - and
> that could lead to a vulnerability that you DIDN'T demonstrate.
>
> You just uploaded a .sh file. There's no harm in that as nowhere did you
> prove that that file is being executed. Similarly (and that has been
> pointed out in this thread) you could upload a PHP-GIF polyglot file to a
> J2EE application - no vulnerability in this. Prove something by overwriting
> a crucial file, tricking other user's browser to execute the file as HTML
> from an interesting domain (XSS), popping a shell, triggering XXE when the
> file is processed as XML, anything. Then that is a vulnerability. So far -
> sorry, it is not, and you've been told it repeatedly.
>
>
> As for the uploaded files being persistent, there is evidence of that.
>> For instance a remote admin could be tricked to execute some of
>> the uploaded files (Social Engineering).
>>
>
> Come on, seriously? Social Engineering can make him download this file
> from pastebin just as well. That's a real stretch.
>
> IMHO it is not a security issue. You're uploading a file to some kind of
> processing queue that does not validate a file type, but nevertheless only
> processes those files as video - there is NO reason to suspect otherwise,
> and I'd like to be proven wrong here. Proven as in PoC.
>
>
>

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