W3C home > Mailing lists > Public > public-web-security@w3.org > January 2011

Re: XSS mitigation in browsers

From: gaz Heyes <gazheyes@gmail.com>
Date: Fri, 21 Jan 2011 20:23:17 +0000
Message-ID: <AANLkTi=UQ+u47HdmwxjRK83Hkjq5=hOP3NCjKo0pBKB+@mail.gmail.com>
To: Michal Zalewski <lcamtuf@coredump.cx>
Cc: Giorgio Maone <g.maone@informaction.com>, Daniel Veditz <dveditz@mozilla.com>, Brandon Sterne <bsterne@mozilla.com>, public-web-security@w3.org, Lucas Adamski <ladamski@mozilla.com>
On 21 January 2011 17:25, Michal Zalewski <lcamtuf@coredump.cx> wrote:

> >> Also, what if a frame is moved underneath the cursor just milliseconds
> >> before the user clicks something - in which case, the tooltip appears
> >> too late to allow for any meaningful reaction?
> >
> > JavaScript should not be able to control of iframes that have been
> allowed
> > with x-frame-options.
> That does not solve the problem; a frame can be repositioned by moving
> around a <div> that contains it, or deleting / adding elements before
> it. The ability to control page layout from JS level to this extent
> appears to be essential to how the Internet works today.
Yeah that's the problem as it stands today but I'm proposing a different
behaviour for iframes in general when the x-frames-option header is applied
to allow framing. Moving a parent div would count as dynamic styling of the
iframe. The iframe could there stay where it is or be removed from display.

> I don't think it's a very bad proposal, but it immediately runs into a
> number of problems that are difficult to seamlessly account for, which
> is why I haven't proposed it back in 2008 - opting for blocking input
> to partly obstructed frames, instead. Even that got panned on
> complexity and usability grounds; some of that criticism is knee-jerk,
> but some is very much valid ;-)

These are awesome points :) I'm simply listing a possible solution and
you're breaking it apart which is good, the next stage is to work out
suitable solutions to all points raised. I'm in favour of a complete iframe
behaviour change but it seems you're against it as it breaks the current way
we display content on the web.
Received on Friday, 21 January 2011 20:23:50 UTC

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