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ms02-072

ms02-072
Posted Dec 24, 2002
Site microsoft.com

Microsoft Security Advisory MS02-072 - The Windows Shell has a serious buffer overflow in the routine that extracts attribute information from audio files which allows remote attackers to execute code with privileges of the user if you move your mouse pointer over an evil mp3 or wma file on a website, HTML email, or windows share. An HTML email could cause the vulnerable code to be invoked when a user opened or previewed the email.

tags | remote, overflow, shell
systems | windows
SHA-256 | d86a95f6a915a23475420a215b6ed7ac33bc04fa7b4378da86a89d551b5dec4e

ms02-072

Change Mirror Download
-----BEGIN PGP SIGNED MESSAGE-----

- ----------------------------------------------------------------------
Title: Unchecked Buffer in Windows Shell Could Enable System
Compromise (329390)
Date: 18 December 2002
Software: Microsoft Windows XP
Impact: Run code of an attacker's choice
Max Risk: Critical
Bulletin: MS02-072

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/MS02-072.asp
http://www.microsoft.com/security/security_bulletins/ms02-072.asp
- ----------------------------------------------------------------------

Issue:
======
The Windows Shell is responsible for providing the basic framework
of the Windows user interface experience. It is most familiar to
users as the Windows Desktop, but also provides a variety of other
functions to help define the user's computing session, including
organizing files and folders, and providing the means to start
applications.

An unchecked buffer exists in one of the functions used by the
Windows Shell to extract custom attribute information from audio
files. A security vulnerability results because it is possible
for a malicious user to mount a buffer overrun attack and attempt
to exploit this flaw.

An attacker could seek to exploit this vulnerability by creating
an .MP3 or .WMA file that contained a corrupt custom attribute
and then host it on a website, on a network share, or send it via
an HTML email. If a user were to hover his or her mouse pointer
over the icon for the file (either on a web page or on the local
disk), or open the shared folder where the file was stored, the
vulnerable code would be invoked. An HTML email could cause the
vulnerable code to be invoked when a user opened or previewed the
email. A successful attack could have the effect of either causing
the Windows Shell to fail, or causing an attacker's code to run on
the user's computer in the security context of the user.


Mitigating Factors:
====================
- The vulnerability lies in the Windows Shell, rather than Windows
Media Player. As a result, playing an audio file with Windows
Media Player would not pose any additional risk.

- Outlook 98 and 2000 (after installing the Outlook Email Security
Update),Outlook 2002, and Outlook Express 6 all open HTML mail in
the Restricted Sites Zone. Customers who are using these products
and who have also installed Windows XP Service Pack 1 or any
recent security patch for Internet Explorer that disables frames
in the Restricted Sites zone would not be at risk from automated
email-borne attacks. However, these customers could still be
attacked if they choose to click on a hyperlink in a malicious
HTML email.

- In the case where an attacker's code was executed, the code
would run in the security context of the user. As a result,
any limitations on the user's ability would also restrict the
actions that an attacker's code could take.

Risk Rating:
============
- Windows XP: Critical

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
Security Bulletin at
http://www.microsoft.com/technet/security/bulletin/ms02-072.asp
for information on obtaining this patch.

Acknowledgment:
===============
- Foundstone Research Labs (http://www.foundstone.com)

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

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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