full-disclosure - Re: Firefox bookmark cross-domain surfing vulnerability

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Message-ID: <6905b1570702220512i51bc09cdt493a48d78ce93182@mail.gmail.com>
Date: Thu, 22 Feb 2007 13:12:02 +0000
From: "pdp (architect)" <pdp.gnucitizen@...glemail.com>
To: "Michal Zalewski" <lcamtuf@...ne.ids.pl>
Cc: security@...illa.org, bugtraq@...urityfocus.com,
	full-disclosure@...ts.grok.org.uk
Subject: Re: Firefox bookmark cross-domain surfing
	vulnerability

This vulnerability is cute but not very useful mainly because a lot of
social engineering is required.

However, here is an interesting thought for you: instead of asking the
user into bookmarking a page you can supply the bookmark directly to
their browser by using Live Bookmarks. So, a mainstream attack will be
when a SPLOG network injects malicious links into their feeds. If
someone happens to be subscribed to this network with a Live Bookmark
and they click on it... well you know.

I haven't tested this, although it should work. So, although I would
rate this issue as low risk, it could as well be quite high or at
least medium.

cheers

On 2/22/07, Michal Zalewski <lcamtuf@...ne.ids.pl> wrote:
> On Thu, 22 Feb 2007, pdp (architect) wrote:
>
> > michal, is that a feature or a bug? maybe it is not obivous to me what
> > you are doing but it i feel that it is almost like asking the user to
> > bookmark a bookmarklet.
>
> Bookmarklets should be bookmarkable only manually, with user knowledge and
> consent (that is, you need to copy-and-paste the URL, etc). This seems to
> be the case for javascript: URLs.
>
> Here, the situation is different: the user can, and quite likely will,
> unknowingly bookmark a script while attempting to bookmark a regular page
> via Ctrl-D + <return>. He doesn't expect or want this code to later run in
> the context of his start page or any other resource (principle of least
> astonishment, etc, etc).
>
> Cheers,
> /mz
>

-- 
pdp (architect) | petko d. petkov
http://www.gnucitizen.org

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