bugtraq - Re: Internet Explorer and Opera local zone restriction bypass

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Date: Sun, 26 Oct 2003 08:20:10 +1100 (EST)
From: psz@...hs.usyd.edu.au (Paul Szabo)
To: NTBUGTRAQ@...TSERV.NTBUGTRAQ.COM, bugtraq@...urityfocus.com,
	full-disclosure@...ts.netsys.com, mindwarper@...uxmail.org,
	psz@...hs.usyd.edu.au, thor@...x.com
Subject: Re: Internet Explorer and Opera local zone restriction bypass


Thor Larholm <thor@...X.COM> wrote:

> ... this is not a problem with Microsofts Internet Explorer, but ...
> There are two completely new issues at hand here.
> The second issue is that IE ... inadvertently redirects to a local file ...
> Content-Location: file:///c:/somefile.html
> ... circumvents the initial restriction ... on all local protocols,
> such as file:// and res:// ...

How is that not an IE problem? Do all MS apologist self-contradict?

> Being able to store arbitrary content in a known location is vital to
> any of the current range of IE exploits. ...
> A similar issue ... has been found on several occasions where a
> third-party non-Microsoft application allows you to store arbitrary
> content in a known location. ...
> In summary, when Macromedia changes their Flash player to no longer
> store Flash cookies in plaintext in a known location, this will no
> longer be an issue. ... I doubt we will see any malicious use of the
> local file redirection variation you found.

My favourite store-arbitrary-local-file application is Eudora: it
pre-extracts attachments into files in a known location.

Cheers,

Paul Szabo - psz@...hs.usyd.edu.au  http://www.maths.usyd.edu.au:8000/u/psz/
School of Mathematics and Statistics  University of Sydney   2006  Australia