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

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

           ESB-2003.0072 -- Microsoft Security Bulletin MS03-005
  Unchecked Buffer in Windows Redirector Could Allow Privilege Elevation
                                 (810577)
                             06 February 2003

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

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

Product:                Windows Redirector
Vendor:                 Microsoft
Operating System:       Windows XP
Platform:               i386
                        IA-64
Impact:                 Administrator Compromise
                        Denial of Service
Access Required:        Existing Account

Comment: CVE Id: CAN-2003-0004

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

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

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

Title:      Unchecked Buffer in Windows Redirector Could Allow
            Privilege Elevation (810577)
Date:       05 February 2003
Software:   Microsoft Windows XP
Impact:     Privilege elevation
Max Risk:   Important
Bulletin:   MS03-005

Microsoft encourages customers to review the Security Bulletins at: 
http://www.microsoft.com/technet/security/bulletin/ms03-005.asp
http://www.microsoft.com/security/security_bulletins/ms03-005.asp
- - -------------------------------------------------------------------


Issue:
======
The Windows Redirector is used by a Windows client to access files, 
whether local or remote, regardless of the underlying network 
protocols in use. For example, the "Add a Network Place" Wizard or 
the NET USE command can be used to map a network share as a local 
drive, and the Windows Redirector will handle the routing of 
information to and from the network share.

A security vulnerability exists in the implementation of the 
Windows Redirector on Windows XP because an unchecked buffer is 
used to receive parameter information. By providing malformed data 
to the Windows Redirector, an attacker could cause the system to 
fail, or if the data was crafted in a particular way, could run 
code of the attacker's choice. 

Mitigating Factors:
====================
 - An attacker would require the ability to log onto the system 
interactively in order to run programs that use the Windows 
Redirector. This vulnerability cannot be exploited remotely. 
 - Windows XP systems that are not shared between users would not 
be at risk.
 
Risk Rating:
============
 - Windows XP: Important

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletins at

   http://www.microsoft.com/technet/security/bulletin/ms03-005.asp
   http://www.microsoft.com/security/security_bulletins/ms03-005.asp

   for information on obtaining this patch.

Acknowledgment:
===============
 - NSFocus (http://www.nsfocus.com)

Home User Security Notification Service
=======================================
Microsoft is now offering the Microsoft Security Update, a security 
bulletin notification service for home users.  To learn more about 
this service, please go to: 

http://www.microsoft.com/security/security_bulletins/decision.asp

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


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

iQEVAwUBPkFkK40ZSRQxA/UrAQHveggArplVZ+xJOiBNEztCmEu3mQNk2Yt8bX6A
4Ua76YSaBOQgl2ukzlX8vFhcBBLzcEbAay0AYkLlxl05UrPXNdOSdS8j/qYp+8zP
GTfJpZ95VoWZi6mlL/AEKWYRaWpLLXiFnn/PT+ORobWOuHeLQ4A0NHfQq3EAPVIV
oIjJrluSpmSIKSvhcGtYEmGhHBggS9fVYb1TtNPs3RCAMuiSivxXSnVmALUsobkC
RMsjQllfUy5VxlPLYtMQ4DkVYu+OHnLQ/k6+OyG8qpR9/6I4pO+rtqyfVsu1YBXn
5dVDdhZCl1uGIw0Y2JXFqntj+ExZp7vd9amQM9sYMMDEE17quvQKwQ==
=aCRC
- -----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 use any or all of this information is
the responsibility of each user or organisation, and should be done so in
accordance with site policies and procedures.

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 system has been compromised, contact AusCERT or
your representative in FIRST (Forum of Incident Response and Security
Teams).

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-----
Version: 2.6.3i
Charset: noconv
Comment: http://www.auscert.org.au/render.html?it=1967

iQCVAwUBPkJ9yCh9+71yA2DNAQFMZAQAnbNeoaeqXdiNWnyBlZc2HFrU7eMvZTcX
8XggGsPoekYcDxXFhhNzjoVYWSMAjrX7mAZjON9sNilhnVDZFmMnqQNodpEyYRVE
MUJyom8mK/HMo0pK4J9EItT6I48IOSoX+CZCC0koMOvd5G6HcuBU4olvcAf3cEse
8Bz0T9ue2lA=
=GI+1
-----END PGP SIGNATURE-----