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Re: Firefox: serious cookie stealing / same-domain bypass vulnerability

From: Base64 <base640 () gmail com>
Date: Thu, 15 Feb 2007 23:31:01 -0800
This vuln is not exploitable in this condition against IIS server 6
and possibly earlier versions.  IIS will die on the null character in
the new request.  It doesn't seem like anyone has brought up this
fact.

Example (IIS): location.hostname='microsoft.com\x00www.coredump.cx';

Output:
microsoft.com returns '400 Bad Request.'.

Any input would be appreciated until the obvious patch comes out.

Regards,
base


On 2/15/07, pdp (architect) <pdp.gnucitizen () googlemail com> wrote:

weird, firefox slowly dies out

t2.html
<html>
        <body>
                <iframe src="t1.html"></iframe>
        </body>
</html>

t1.html
<html>
        <body>
                <script>location.hostname="blog.com";</script>
        </body>
</html>


On 2/15/07, pdp (architect) <pdp.gnucitizen () googlemail com> wrote:

the first one runs in about:blank which is restricted. the second one
is very interesting but still not very useful because it acts like
about:blank. hmmm it seams that the hostname field has been seriously
overlooked.

On 2/15/07, Michal Zalewski <lcamtuf () dione ids pl> wrote:

On Thu, 15 Feb 2007, pdp (architect) wrote:


I wander whether we can execute code on about:config or about:cache.


Actually, there are several odd problems related to location updates and
location.hostname specifically, including one scenario that apparently
makes the script run with document.location in about: namespace.

I did not research them any further, so I can't say if they're
exploitable - but you can see a demo here, feel free to poke around:

  http://lcamtuf.coredump.cx/fftests.html

Cheers,
/mz
http://lcamtuf.coredump.cx/




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




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



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