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Re: Yet another IE aperture
From: "GreyMagic Security" <security () greymagic com>
Date: Sat, 9 Oct 2004 16:01:18 +0200

can you comment on this testcases:

http://www.guninski.com/where_do_you_want_billg_to_go_today_1_demo2.html
http://www.guninski.com/where_do_you_want_billg_to_go_today_1_demo.html

Interesting, both your exploit code as well as the exploit code we provide
in the advisory (Exploit section) do work flawlessly, it's an implementation
detail in the live PoC that's being blocked. Quite a regression for
Microsoft.

The reason we were getting Access denied errors is because of the way the
live PoC was implemented. Apparently, the patch is still applicable when the
XML script block is dynamically included via document.write(). Strangely
enough, the regression only applies to static HTML script blocks.

To those looking to test this on any document, we updated the live PoC to
use a static script block and it now works again.
http://www.greymagic.com/security/advisories/gm009-ie/

We added the following update to the original advisory:
...
Update - 9 Oct 2004

Apparently, there has been a regression in Internet Explorer that caused it
to be vulnerable to this issue once again. The regression was spotted by
Georgi Guninski.

Interestingly enough, the regression is only visible when the <script> block
is static in the page, dynamic blocks (via document.write) are protected.
...

Cheers

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