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Category:   Application (Web Browser)  >   Microsoft Internet Explorer Vendors:   Microsoft
Microsoft Internet Explorer Has Another Frame Domain Security Bug That Lets Remote Users View Files or Other Personal Information from a Victim's Computer By Using Malicious VBScripts
SecurityTracker Alert ID:  1003630
SecurityTracker URL:  http://securitytracker.com/id/1003630
CVE Reference:   CVE-2002-0052   (Links to External Site)
Updated:  Jun 3 2008
Original Entry Date:  Feb 22 2002
Impact:   Disclosure of authentication information, Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.01, 5.5, 6
Description:   Microsoft reported another frame domain security vulnerability in Internet Explorer (IE). A remote user could view files on the victim's system or could view content that the victim has recently viewed or typed in on other web sites.

A flaw reportedly exists in how VBScript is handled in IE relating to validating cross-domain access. A remote user can create a web page or HTML-base e-mail message containing VBScripts that, when viewed by another target user, could access files on the target user's host or could capture the contents of other web sites recently visited by the target user.

To access a file, the remote user must know the exact file name and path and the file must be readable by a web browser.

Microsoft assigns this bug a "Moderate" severity rating for Internet and Intranet Systems and a "Critical" rating for Client Systems.

Impact:   A remote user could view files on another user's host or could view content from a web site that the user has recently visited (potentially including username, password, and credit card data that the user entered to the web site).
Solution:   The vendor has released a fix for IE, available at:

http://www.microsoft.com/Windowsupdate

The IE 5.01 patch can reportedly be applied to Windows 2000 Systems with SP2 running IE 5.01. The IE 5.5 patch can reportedly be installed on systems running IE 5.5 SP1 or SP2. The IE 6.0 patch can reportedly be installed on system running IE 6.0 Gold.

According to Microsoft, this fix will also be included in Internet Explorer 6.0 SP1.

Microsoft plans to release Knowledge Base article Q318089 on this topic shortly.

Vendor URL:  www.microsoft.com/technet/security/bulletin/MS02-009.asp (Links to External Site)
Cause:   Access control error
Underlying OS:  Windows (Any)

Message History:   None.


 Source Message Contents

Subject:  Microsoft Security Bulletin MS02-009


-----BEGIN PGP SIGNED MESSAGE-----

- -
- ----------------------------------------------------------------------
Title:      Incorrect VBScript Handling in IE can Allow Web Pages to
            Read Local Files
Date:       21 February 2002
Software:   Internet Explorer
Impact:     Information Disclosure
Max Risk:   Critical
Bulletin:   MS02-009

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS02-009.asp.
- -
- ----------------------------------------------------------------------

Issue:
======
Frames are used in Internet Explorer to provide for a fuller 
browsing experience. By design, scripts in the frame of one site or
domain should be prohibited from accessing the content of frames
in another site or domain. However, a flaw exists in how VBScript
is handled in IE relating to validating cross-domain access. This
flaw can allow scripts of one domain to access the contents of
another domain in a frame. 

A malicious user could exploit this vulnerability by using
scripting to extract the contents of frames in other domains,
then sending that content back to their web site. This would
enable the attacker to view files on the user's local machine
or capture the contents of third-party web sites the user visited
after leaving the attacker's site. The latter scenario could,
in the worst case, enable the attacker to learn personal
information like user names, passwords, or credit card information.

In both cases, the user would either have to go to a site under
the attacker's control or view an HTML email sent by the attacker.
In addition, the attacker would have to know the exact name and
location of any files on the user's system. Further, the attacker
could only gain access to files that can be displayed in a browser
window, such as text files, HTML files, or image files.

Mitigating Factors:
====================
 - The vulnerability could only be used to view files. It could not
   be used to create, delete, modify or execute them. 

 - The vulnerability would only allow an attacker to read files that
   can be opened in a browser window, such as image files, HTML
   files and text files. Other file types, such as binary files,
   executable files, Word documents, and so forth, could not be read.

 - The attacker would need to specify the exact name and location of
   the file in order to read it. 

 - The email-borne attack scenario would be blocked if the user were
   using any of the following: Outlook 98 or 2000 with the Outlook
   Email Security Update installed; Outlook 2002; or Outlook 
   Express 6.

Risk Rating:
============
 - Internet systems: Moderate
 - Intranet systems: Moderate
 - Client systems: Critical

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-009.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Zentai Peter Aron, Ivy Hungary Ltd (http://w3.ivy.hu/)

- -
- ---------------------------------------------------------------------

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS 
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL 
WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE 
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT 
SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY
DAMAGES 
WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL,
LOSS OF 
BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR
ITS 
SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME
STATES DO 
NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL
OR 
INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.

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*******************************************************************

You have received this e-mail bulletin as a result of your subscription to the Microsoft Product Security Notification   Service.
  For more information on this service, please visit http://www.microsoft.com/technet/security/notify.asp.

To verify the digital signature on this bulletin, please download our PGP key at http://www.microsoft.com/technet/security/notify.asp.

For security-related information about Microsoft products, please  visit the Microsoft Security Advisor web site at http://www.microsoft.com/security.

 
 


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