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Re: silly PoCs continue: X-Frame-Options give you less than expected


From: xD 0x41 <secn3t () gmail com>
Date: Sun, 11 Dec 2011 10:25:41 +1100

Its awesome ... and works, but, yes conditions must be met for
firefox8 still... this is 2011 ;s almost 12!
this is, i guess a great PoC and info but, only some ppl realise the
potentiall to this....
anyhow, thanks Mike,thats a GREAT job mate :)
/xd


On 11 December 2011 09:39, Michal Zalewski <lcamtuf () coredump cx> wrote:
At the risk of annoying everyone...

I think we greatly underappreciate the extent to which JavaScript
allows you to exploit the limits of human perception. On modern
high-performance systems, windows can be opened, positioned, and
closed; and documents loaded and then navigated away from; so quickly
that we can't even reliably notice that, let alone react consciously.

The PoC I posted here earlier this week
(http://lcamtuf.coredump.cx/switch/) demonstrates one example of page
transitions occurring so fast that you don't register it; and some of
my earlier posts outlined the exploitation of page switching to
exploit browser UIs (e.g. http://lcamtuf.coredump.cx/ffgeo2/). Today,
I wanted to share this brief demonstration of an attack that should
hopefully illustrate why our current way of thinking about
clickjacking (and the possible defenses, such as X-Frame-Options) is
flawed:

http://lcamtuf.coredump.cx/clickit/

The basic idea here is that instead of placing the UI you want to
tamper with in an invisible or only partly-visible <iframe>, you can
achieve a similar effect simply by predicting the time of a
premeditated click (which is fairly easy if you look at mouse velocity
and distance to the expected destination), and then either destroying
the current window, or navigating to a different document (in this
case, a cheesy banking site).

While everything about this exploit is extremely goofy, and I put no
effort into making the transitions less obvious, it should still
demonstrate the issue neatly.

/mz

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