Re: Fwd: Google vulnerabilities with PoC

["Nicholas Lemonias." <lem.nikolas () googlemail com>]

You are trying to execute an sh script through a video player. That's an
exec() command. So its the wrong way about accessing the file.


On Fri, Mar 14, 2014 at 8:20 PM, R D <rd.seclists () gmail com> wrote:

> No it's not. As Chris and I are saying, you don't have proof your file is
> accessible to others, only that is was uploaded. Now, you see, when you
> upload a video to youtube, you get the adress where it will be viewable in
> the response. In your case :
>
> {"sessionStatus":{"state":"FINALIZED","externalFieldTransfers":[{"name":"file","status":"COMPLETED","bytesTransferred":113,"bytesTotal":113,"formPostInfo":{"url":"
> http://www.youtube.com/upload/rupio?authuser=0\u0026upload_id=AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw\u0026file_id=000
> ","cross_domain_url":"
> http://upload.youtube.com/?authuser=0\u0026upload_id=AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw\u0026origin=CiNodHRwOi8vd3d3LnlvdXR1YmUuY29tL3VwbG9hZC9ydXBpbxINdmlkZW8tdXBsb2Fkcw"},"content_type":"text/x-sh"}],"additionalInfo":{"uploader_service.GoogleRupioAdditionalInfo":{"completionInfo":{"status":"SUCCESS","customerSpecificInfo":{"status":
> "ok", *"video_id": "KzKDtijwHFI"*
> }}}},"upload_id":"AEnB2UqVZlaog3GremriQEGDoUK3cdGGPu9MVIfyObgYajjo6i1--uQicn6jhbwsdNrqSF4ApbUbhCcwzdwe4xf_XTbL_t5-aw"}}
> And what do we get when we browse to
> https://youtube.com/watch?v=KzKDtijwHFI ?
> Nothing.
> Can you send me a link where I can access the file content of the
> arbitrary file you uploaded?
> Are you sure this json response, or this file, will be there in a month?
> Or in a year? Is the fact that this json response exists a threat to
> youtube? Can you quantify how of a threat? How much, in dollars, does it
> hurt their business?
>
> --Rob
>
>
> On Fri, Mar 14, 2014 at 9:08 PM, Nicholas Lemonias. <
> lem.nikolas () googlemail com> wrote:
>
> > My claim is now verified....
> >
> > Cheers!
> >
> >
> > On Fri, Mar 14, 2014 at 8:04 PM, Nicholas Lemonias. <
> > lem.nikolas () googlemail 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 () googlemail 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 () gmail 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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