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

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Date: Thu, 12 Dec 2013 13:25:31 -0800
From: Michal Zalewski <lcamtuf@...edump.cx>
To: Jann Horn <jann@...jh.net>
Cc: full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: Re: Clickjacking (?) on Facebook.com (Question)

> 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 (at that rate, somewhere by year
2032).

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).

> 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.

/mz

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