bugtraq - Re: Browser bugs hit IE, Firefox today (SANS)

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Message-ID: <aff68f010607121252r4492825dg6094d616e1a8d9b3@mail.gmail.com>
Date: Wed, 12 Jul 2006 15:52:55 -0400
From: 3CO <threecheeseopera@...il.com>
To: thor@...ypath.com
Cc: bugtraq@...urityfocus.com
Subject: Re: Browser bugs hit IE, Firefox today (SANS)


On 7/4/06, Thor Larholm <thor@...ypath.com> wrote:
> However, reading the contentDocument property of the DOM element instead
> of the through the frames collection will give you a reference to the
> document object inside the thirdparty domain and even allow you to
> overwrite native DOM methods without throwing a security exception, such
> as
> document.getElementById("thirdparty").contentDocument.getElementById=function(s){alert(s)}.


This code throws an exception in Firefox 1.5.0.4:
"Error: uncaught exception: Permission denied to set property
HTMLDocument.getElementById
"

Just obtaining a reference to the contentDocument works, but any
action on it throws an error.