Operating System:

[WIN]

Published:

21 August 2003

Protect yourself against future threats.

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

===========================================================================
             AUSCERT External Security Bulletin Redistribution

       ESB-2003.0586 -- Microsoft Security Bulletin MS03-030 REVISED
    Unchecked Buffer in DirectX Could Enable System Compromise (819696)
                              21 August 2003

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:                DirectX
Publisher:              Microsoft
Operating System:       Windows
Impact:                 Execute Arbitrary Code/Commands
                        Denial of Service
Access Required:        Remote
CVE Names:              CAN-2003-0346

Ref:                    ESB-2003.0509

- --------------------------BEGIN INCLUDED TEXT--------------------

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

- - ----------------------------------------------------------------------
Title:      Unchecked Buffer in DirectX Could Enable System 
            Compromise (819696)
Released:   23 July 2003
Revised:    20 August 2003 (version 2.0)

Software:   Microsoft DirectX(r) 5.2 on Windows 98 
            Microsoft DirectX 6.1 on Windows 98 SE 
            Microsoft DirectX 7.1 on Windows Millennium Edition 
            Microsoft DirectX 7.0 on Windows 2000 
            Microsoft DirectX 8.0, 8.0a, 8.1, 8.1a, and 8.1b when  
             installed on Windows 98, Windows 98 SE, Windows
            Millennium Edition or Windows 2000
            Microsoft DirectX 8.1 on Windows XP or
             Windows Server 2003 
            Microsoft DirectX 9.0a when installed on Windows 98,
             Windows 98 SE, Windows Millennium Edition (Windows Me),
             Windows 2000, Windows XP, or Windows Server 2003  
            Microsoft Windows NT 4.0 Server with either Windows
             Media Player 6.4 or Internet Explorer 6 Service Pack 1
             installed. 
            Microsoft Windows NT 4.0, Terminal Server Edition with
             either Windows Media Player 6.4 or Internet Explorer 6 
             Service Pack 1 installed.

Impact:     Allow an attacker to execute code on a user's system
Max Risk:   Critical
Bulletin:   MS03-030

Microsoft encourages customers to review the Security Bulletin at: 
http://www.microsoft.com/technet/security/bulletin/MS03-030.asp
http://www.microsoft.com/security/security_bulletins/MS03-030.asp
- - ----------------------------------------------------------------------

Reason for Revision:
====================
Subsequent to the original release of this bulletin, customers 
requested that we support additional versions of DirectX that were 
not covered by the original patches. This bulletin has been updated 
to provide information about this new patch.

Issue:
======
DirectX consists of a set of low-level Application Programming 
Interfaces (APIs) that are used by Windows programs for multimedia 
support. Within DirectX, the DirectShow technology performs client-
side audio and video sourcing, manipulation, and rendering. 
There are two buffer overruns with identical effects in the 
function used by DirectShow to check parameters in a Musical 
Instrument Digital Interface (MIDI) file. A security vulnerability 
results because it could be possible for a malicious user to 
attempt to exploit these flaws and execute code in the security 
context of the logged-on user. 

An attacker could seek to exploit this vulnerability by creating a 
specially crafted MIDI file designed to exploit this vulnerability 
and then host it on a Web site or on a network share, or send it by 
using an HTML-based e-mail. In the case where the file was hosted 
on a Web site or network share, the user would need to open the 
specially crafted file. If the file was embedded in a page the 
vulnerability could be exploited when a user visited the Web page. 
In the HTML-based e-mail case, the vulnerability could be exploited 
when a user opened or previewed the HTML-based e-mail. A successful 
attack could cause DirectShow, or an application making use of 
DirectShow, to fail. A successful attack could also cause an 
attacker's code to run on the user's computer in the security 
context of the user.

Mitigating Factors:
====================
- - - By default, Internet Explorer on Windows Server 2003 runs in  
Enhanced Security Configuration. This default configuration of 
Internet Explorer blocks the e-mail-based vector of this attack 
because Microsoft Outlook Express running on Windows Server 2003 by 
default reads e-mail in plain text. If Internet Explorer Enhanced 
Security Configuration were disabled, the protections put in place 
that prevent this vulnerability from being exploited would be 
removed. 
- - - In the Web-based attack scenario, the attacker would have to host 
a Web site that contained a Web page used to exploit these 
vulnerabilities. An attacker would have no way to force users to 
visit a malicious Web site outside the HTML-based e-mail vector. 
Instead, the attacker would need to lure them there, typically by 
getting them to click a link that would take them to the attacker's 
site. 
- - - The combination of the above means that on Windows Server 2003 an 
administrator browsing only to trusted sites should be safe from 
this vulnerability. 
- - - Code executed on the system would only run under the privileges 
of the logged-on user.

Risk Rating:
============
- - - Critical

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletins at
   http://www.microsoft.com/technet/security/bulletin/MS03-030.asp
   http://www.microsoft.com/security/security_bulletins/MS03-30.asp
   for information on obtaining this patch.

Acknowledgment:
===============
- - - eEye Digital Security, http://www.eeye.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.


- -----BEGIN PGP SIGNATURE-----
Version: PGP 7.1

iQEVAwUBP0OhuI0ZSRQxA/UrAQH4Cgf/YwFILLEzgB44EjDdJRPU2HngXEi6NUkK
QyTejhXUS2VvxrlWNwPD55JliEpdiG+Ee5pk+soK4Mu+KSqbcs3WhIWBZIvw3zv6
VfIDRnGExMEhI5ic5WgbT/e1r4+1Td4llTqDG9g27bNWbdOM/wvKb5VaVfSbXD6w
+bS2OPz4trWv3YAcZtKStT459wi0H255YBszfeLVXvTTFp+YmFoIXqMbwznwBTnx
CrLgRXnQ3Mgt2X/z8W9sB6r78FeYI0Idg3FtNY8cb+cYByUkUtPWNBps2NtKZO5e
lZijRiL/RAtjE04eEHKa82m9GfSL4I+AKfR+XKc0knQcxqHomvZREw==
=BVrU
- -----END PGP SIGNATURE-----

- --------------------------END INCLUDED TEXT--------------------

You have received this e-mail bulletin as a result of your organisation's
registration with AusCERT. The mailing list you are subscribed to is
maintained within your organisation, so if you do not wish to continue
receiving these bulletins you should contact your local IT manager. If
you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business 
                hours which are GMT+10:00 (AEST).  On call after hours 
                for member emergencies only.
-----BEGIN PGP SIGNATURE-----
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBP0Ql7Ch9+71yA2DNAQHxgQP/dDuA+cEhr3EOISbzgXqtYwNnPsxOJGEC
kb3yu+DKjTcooPbDyo48fUs4G7iZTfi3g7YnFMaBoy82faGanx168L1qi0XGLDsc
ne0jgQE/kAPNbm+ISM12xWrJruMbuPY/P2CxvEIiFjUMlaYqzUGW0UADMMN0r1Rs
GlWVAIeIlWg=
=iDo/
-----END PGP SIGNATURE-----