bugtraq - Saved XSS vulnerability in Internet Explorer

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Date: Sun, 14 Nov 2010 19:53:42 +0200
From: "MustLive" <mustlive@...security.com.ua>
To: <bugtraq@...urityfocus.com>
Subject: Saved XSS vulnerability in Internet Explorer

Hello Bugtraq!

I want to warn you about Cross-Site Scripting vulnerability in Internet
Explorer. This is Post Persistent XSS (Save XSS)
(http://websecurity.com.ua/2641/).

-------------------------
Affected products:
-------------------------

Vulnerable versions are Internet Explorer 6 (6.0.2900.2180), Internet
Explorer 7 (7.00.5730.13), Internet Explorer 8 (8.00.6001.18702) and
previous versions.

----------
Details:
----------

This hole is similar to Cross-Site Scripting vulnerability in Internet
Explorer (http://websecurity.com.ua/1241/) - CVE-2007-4478
(http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2007-4478). Which I
found in August 2007 and informed Microsoft, and they ignored it and didn't
fix it in IE6, and they didn't fixed it in IE7 (and also in IE6) after my
informing in 2008. But they silently and lamerly fixed it in IE8, as I found
in May 2010 when checked this hole in IE8. This vulnerability is different
from previous one in that, that the attack is going not via saving web page,
but saving web archive (mht/mhtml file) - similarly to Cross-Site Scripting
in Opera (http://websecurity.com.ua/2555/), which I wrote about in 2008. All
versions of IE6, IE7 and IE8 are affected to this hole.

XSS (WASC-08):

http://site/?--><script>alert("XSS")</script>

For the attack it's needed to visit such URL and save html page as mht/mhtml
file (Web archive). For executing of the code it's needed that file was
saved not with mht or mhtml extension, but with htm or html extension. After
that when opening saved page in any browser the code will run. Attacking
code are saving inside of the file.

This vulnerability - it's Saved XSS and Local XSS
(http://websecurity.com.ua/4219/).

To make hidden attack an iframe can be used in code of the page:

<iframe src='http://site/?--><script>alert("XSS")</script>' height='0'
width='0'></iframe>

------------
Timeline:
------------

2010.11.12 - found vulnerability.
2010.11.12 - disclosed at my site.
2010.11.13 - informed Microsoft.

I mentioned about this vulnerability at my site
(http://websecurity.com.ua/4677/).

Best wishes & regards,
MustLive
Administrator of Websecurity web site
http://websecurity.com.ua