full-disclosure - things you can do with downloads

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Date: Wed, 30 May 2012 13:35:25 -0700
From: Michal Zalewski <lcamtuf@...edump.cx>
To: bugtraq <bugtraq@...urityfocus.com>, 
	full-disclosure <full-disclosure@...ts.grok.org.uk>
Subject: things you can do with downloads

Another moderately interesting tidbit, I guess...

It is an important and little-known property of web browsers that one
document can always navigate other, non-same-origin windows to
arbitrary URLs. Perhaps more interestingly, you can also navigate
third-party documents to resources served with Content-Disposition:
attachment, in which case, you get the original contents of the
address bar, plus a rogue download prompt attached to an unsuspecting
page that never wanted you to download that file.

PoC:
http://lcamtuf.coredump.cx/fldl/

More info:
http://lcamtuf.blogspot.com/2012/05/yes-you-can-have-fun-with-downloads.html

It's closely related to many other fundamental, open issues with
browser UI design - but I guess it's an interesting highlight.

/mz

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