Full Disclosure mailing list archives
Re: silly PoCs continue: X-Frame-Options give you less than expected
From: Dave <mrx () propergander org uk>
Date: Sat, 10 Dec 2011 23:29:27 +0000
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 10/12/2011 22:39, Michal Zalewski 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 _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Looks Like I won Michal. Where's my prize? Clever stuff. This kind of thing has occurred to me as system and indeed network/broadband speed have increased. One time a flashing of a neon on a router or modem or the a flash of a window on a desktop gave some indication of data ingress or egress. Nowadays it's done and over with before the user even realises something is afoot. I had to enable Javascript though. I guess I trust you not to burn my ass. There are not many links posted on this list which I would click with javascript enabled. Thanks for your insights and the education Dave -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQEVAwUBTuPrVrIvn8UFHWSmAQJcJAgAqtAh+2LMzLOefwX31DZRNtoMgjWRt2yc 5CxN6uhnli97D9qJWDYOBYWJhO0/IV9zxmdVdQ5Pt+4LxPz2ollUFHbzD5vIWUd/ bYVE5x+cWgt8ZCRbJD5VNZcxYP4QsqRYlVspPcVjeVqKV26qYbCMPF83c/OtNiuR wZq/RmsJHrLWydFbNQfDGI/ufnwYLJEiH4GwqHxIjsajLOqBGztxPcWkIkfDDDQd tbPx49JF8e04aXqdAZlGxFV/sKTJVhaKsKPbUYiVGZF/vYbcFFO3eKF0s39hbBND 5rLH1qmEfzaC799bCZ/8tT/2/EA4xtZjJGrwzyNjA84eEL0J9g2PCw== =10aN -----END PGP SIGNATURE----- _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/
Current thread:
- silly PoCs continue: X-Frame-Options give you less than expected Michal Zalewski (Dec 10)
- Re: silly PoCs continue: X-Frame-Options give you less than expected xD 0x41 (Dec 10)
- Re: silly PoCs continue: X-Frame-Options give you less than expected Dave (Dec 10)
- Re: silly PoCs continue: X-Frame-Options give you less than expected Christian Sciberras (Dec 10)
- Re: silly PoCs continue: X-Frame-Options give you less than expected Michal Zalewski (Dec 10)
- Re: silly PoCs continue: X-Frame-Options give you less than expected Christian Sciberras (Dec 11)
- Re: silly PoCs continue: X-Frame-Options give you less than expected Michal Zalewski (Dec 11)
- Re: silly PoCs continue: X-Frame-Options give you less than expected Michal Zalewski (Dec 10)