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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <CALx_OUCrHGGqoXUhz38p8TGLwBv2nyLhJ+U7DPhPCT36YTjZDw@mail.gmail.com>
Date: Sat, 10 Dec 2011 14:39:19 -0800
From: Michal Zalewski <lcamtuf@...edump.cx>
To: bugtraq <bugtraq@...urityfocus.com>, 
	full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: silly PoCs continue: X-Frame-Options give you
	less than expected

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

_______________________________________________
Full-Disclosure - We believe in it.
Charter: http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia - http://secunia.com/