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Category:   Application (Multimedia)  >   Windows Media Player Vendors:   Microsoft
Windows Media Player Allows Malicious Media Files to Execute Arbitrary Code on the Player's Host
SecurityTracker Alert ID:  1002088
SecurityTracker URL:  http://securitytracker.com/id/1002088
CVE Reference:   CVE-2001-0541   (Links to External Site)
Date:  Jul 27 2001
Impact:   Execution of arbitrary code via network, Root access via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 6.4, 7.0, 7.1
Description:   Microsoft reports that there is a vulnerability in the Windows Media Player that could allow a remote user (via a web site or via e-mail) to cause arbitrary code to be executed by the player when a certain media format is accessed by the player. This could allow a remote user to gain control of the player's host.


The vulnerability is reportedly due to an unchecked buffer in the processing of Windows Media Station (.NSC) files.

A remote user can include a particular type of malformed entry in a .NSC file to cause arbitrary code to be executed when a user plays the .NSC media file.

Impact:   A remote user can cause arbitrary code to be executed when the Windows Media Player loads a certain media file. The code will be executed with the privileges of the Windows Media Player user.
Solution:   The vendor has released a patch. The vendor recommends that Windows Media Player 6.4 customers should either install the patch or upgrade to Windows Media Player 7.1 and then install the patch, that Windows Media Player 7.0 customers should upgrade to Windows Media Player 7.1 and install the patch, and that Windows Media Player 7.1 customers should apply the patch. See the Vendor URL for patch locations.
Vendor URL:  www.microsoft.com/technet/security/bulletin/ms01-042.asp (Links to External Site)
Cause:   Boundary error

Message History:   None.


 Source Message Contents

Subject:  Microsoft Security Bulletin MS01-042


The following is a Security  Bulletin from the Microsoft Product Security
Notification Service.

Please do not  reply to this message,  as it was sent  from an unattended
mailbox.
                    ********************************

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

- ----------------------------------------------------------------------
Title:      Windows Media Player .NSC Processor Contains Unchecked
            Buffer
Date:       26 July 2001
Software:   Windows Media Player 6.4, 7, and 7.1
Impact:     Run code of attacker's choice.
Bulletin:   MS01-042

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS01-042.asp.
- ----------------------------------------------------------------------

Issue:
======
Windows Media Player provides support for audio and video streaming. 
Streaming media channels can be configured by using Windows Media 
Station (.NSC) files. An unchecked buffer exists in the functionality
used to process Windows Media Station files. This unchecked buffer 
could potentially allow an attacker to run code of his choice on the 
machine of another user. The attacker could either send a specially 
malformed file to another user and entice her to run or preview it,
or 
he could host such a file on a web site and cause it to launch 
automatically whenever a user visited the site. The code could take
any action on the machine that the legitimate user himself could
take.

Mitigating Factors:
====================
 - Customers who have applied the Outlook E-mail Security Update
   (OESU) for Outlook 2000 or are running Outlook XP, which has the
   OESU functionality built-in, are automatically protected against
   HTML e-mail based attempts to exploit this vulnerability.
 
 - For others not in the above categories, the attacker would have to
   entice the potential victim to visit a web site he controlled, or
to
   open an HTML e-mail he had sent. 

 - The attacker would need to know the specific operating system that
   the user was running in order to tailor the attack code properly;
if
   the attacker made an incorrect guess about the user's operating
   system platform, the attack would crash the user's Windows Media
   Player session, but not run code of the attacker's choice. 

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-042.asp
   for information on obtaining this patch.

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

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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