bugtraq - Re: [Full-disclosure] Firefox bookmark cross-domain surfing vulnerability

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Date: Thu, 22 Feb 2007 01:50:27 +0100 (CET)
From: Michal Zalewski <lcamtuf@...ne.ids.pl>
To: "pdp (architect)" <pdp.gnucitizen@...glemail.com>
Cc: bugtraq@...urityfocus.com, security@...illa.org,
	full-disclosure@...ts.grok.org.uk
Subject: Re: [Full-disclosure] Firefox bookmark cross-domain surfing
 vulnerability

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