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Date: Fri, 14 Mar 2014 20:08:14 +0000
From: "Nicholas Lemonias." <lem.nikolas@...glemail.com>
To: Chris Thompson <christhom7851@...il.com>, full-disclosure@...ts.grok.org.uk
Subject: Re: Fwd: Google vulnerabilities with PoC

My claim is now verified....

Cheers!


On Fri, Mar 14, 2014 at 8:04 PM, Nicholas Lemonias. <
lem.nikolas@...glemail.com> wrote:

> http://upload.youtube.com/?authuser=0&upload_id=
> AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--
> uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw&origin=
> CiNodHRwOi8vd3d3LnlvdXR1YmUuY29tL3VwbG9hZC9ydXBpbxINdmlkZW8tdXBsb2Fkcw
>
> That information can be queried from the db, where the metadata are saved.
> The files are being saved persistently , as per the above example.
>
>
> On Fri, Mar 14, 2014 at 8:04 PM, Nicholas Lemonias. <
> lem.nikolas@...glemail.com> wrote:
>
>>
>> http://upload.youtube.com/?authuser=0&upload_id=AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw&origin=CiNodHRwOi8vd3d3LnlvdXR1YmUuY29tL3VwbG9hZC9ydXBpbxINdmlkZW8tdXBsb2Fkcw
>>
>> That information can be queried from the db, where the metadata are
>> saved. The files are being saved persistently , as per the above example.
>>
>>
>> On Fri, Mar 14, 2014 at 8:00 PM, Chris Thompson <christhom7851@...il.com>wrote:
>>
>>> Hi Nikolas,
>>>
>>> Please do read (and understand) my entire email before responding - I
>>> understand your frustration trying to get your message across but maybe
>>> this will help.
>>>
>>> Please put aside professional pride for the time being - I know how it
>>> feels to be passionate about something yet have others simply not
>>> understand.
>>>
>>> Let me try and bring some sanity to the discussion and explain to you
>>> why people maybe not agreeing with you.
>>>
>>> You (rightly so) highlighted what you believe to be an issue in a
>>> Youtube whereby it appears (to you) than you can upload an arbitrary file.
>>> If you can indeed do this as you suspect then your points are valid and you
>>> "may" be able to cause various issues associated with it such as DOS etc -
>>> especially if the uploaded files cannot or are not tracked.
>>>
>>> However...
>>>
>>> Consider than you are talking to an API and what you are getting back
>>> (the JSON response) in your example is simply a response from the API to
>>> say the file you uploaded has been received and saved.
>>>
>>> Now, as you no doubt know, when you upload a regular movie to YouTube,
>>> once uploaded it goes away and does some post-processing, converting it to
>>> flash for example. What's to say that there isn't some verification aspect
>>> to this post-processing that checks if the file is intact a valid movie and
>>> if not removes it.
>>>
>>> If you could for example demonstrate that the file was indeed
>>> persistent, by being able to retrieve it for example then again, you would
>>> have solid ground to claim an issue however your claims at this point are
>>> based on an assumption.... Let me explain.
>>>
>>> 1. You have demonstrated than you can send "any" file to an API and the
>>> API returned an acknowledgment of receiving (and saving) the file.
>>>
>>> 2. You / we don't know what Google do with files once they have been
>>> received from the API - maybe they process them and validate them - we
>>> simply don't know.
>>>
>>> 3. You have hypothesized that you can retrieve the file by manipulating
>>> tokens etc and you may be right, but you have not demonstrated it as such.
>>>
>>> Because of this, you seem to have made a CLAIM that you can upload
>>> arbitrary files to Google however SHOWN that you can simply send files to
>>> an API and an API responds in a certain way.
>>>
>>> I am NOT saying you haven't found an issue, what I am saying is that you
>>> need to demonstrate that the issue is real and thus can be abused. If the
>>> Google service simply verifies all uploaded files once they are uploaded
>>> and discards them if invalid, then you haven't really found anything.
>>>
>>> If you were to prove that you were able to retrieve this uploaded file
>>> then how could anyone dispute your bug.
>>>
>>> Hope this helps....
>>>
>>> Cheers!
>>>
>>
>>
>

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