full-disclosure - Re: Clickjacking (?) on Facebook.com (Question)

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Message-ID: <20131213004747.GD24084@debjann.fritz.box>
Date: Fri, 13 Dec 2013 01:47:47 +0100
From: Jann Horn <jann@...jh.net>
To: Michal Zalewski <lcamtuf@...edump.cx>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Clickjacking (?) on Facebook.com (Question)

On Thu, Dec 12, 2013 at 01:25:31PM -0800, Michal Zalewski wrote:
> > That page allows drag-and-drop of the user's name. If you can convince the user
> > to select his name with a triple-click and then do a drag-and-drop of that name to
> > some place outside the iframe, you can find out his name, so I'd say it's a privacy
> > leak.
> 
> I had something to do with Chrome, Safari, and Firefox disallowing
> cross-domain drag-and-drop:
> 
> http://lcamtuf.coredump.cx/dnd/
> 
> We have pinged Microsoft long time ago about this, too - and hopefully
> this will be resolved on their end

Oh, cool.


> But I wouldn't consider it a failing on part of the targeted website -
> you'd need to put essentially everything behind XFO to fix this
> problem on application level, which is not feasible for a good number
> of websites (including FB, because they have a variety of gadgets that
> are meant to be framed).

Or use JS to make it impossible to select text or so.


> > Yeah, Chromium has protections against that, but they're not exactly
> > bulletproof – they become useless as soon as there's a single page on the
> > victim domain that is framable and somehow lets the user publish data.
> 
> Well, honestly, that becomes a bit of a stretch - if there's a good
> PoC you can put together for Facebook specifically, I suspect it may
> convince them to fix this, though.

I don't think I can do that.

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