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

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Date: Thu, 12 Dec 2013 22:10:45 +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 12:43:00PM -0800, Michal Zalewski wrote:
> What is your exact concern?

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.

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. This is
because Chromium allows drag-and-drop between two frames from the same domain
even if those two frames are inside another page and the drag-and-drop goes
"through" a page with different origin. Also, as far as I know, not all
webbrowsers have such protections.

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