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

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

           ESB-2001.357 -- Microsoft Security Bulletin MS01-046
 Access Violation in Windows 2000 IRDA Driver Can Cause System to Restart
                              22 August 2001

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

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

Product:                Windows 2000
Vendor:                 Microsoft
Impact:                 Denial of Service
Access Required:        Remote

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

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

- - ----------------------------------------------------------------------
Title:      Access Violation in Windows 2000 IRDA Driver Can Cause
            System to Restart
Date:       21 August 2001
Software:   Windows 2000
Impact:     Denial of Service
Bulletin:   MS01-046

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-046.asp.
- - ----------------------------------------------------------------------

Issue:
======
Microsoft Windows 2000 provides support for infrared-based
connectivity.  This support is provided through protocols
developed by the Infrared Data Association (IRDA).  
Because of this, they are often called IRDA devices.  These
devices can be used to share files and printers with other
IRDA-device capable systems.  The software which handles
IRDA devices in Windows 2000 contains an unchecked buffer
in the code which handles certain IRDA packets.

A security vulnerability results because it is possible 
for a malicious user to send a specially crafted IRDA packet
to the victim's system.  This could enable the attacker to conduct
a buffer overflow attack and cause an access violation
on the system, forcing a reboot.  To be best of our knowledge,
it cannot be used to run malicious code on the user's system

Mitigating Factors:
====================
 - The attack would require that an attacker's machine be within
   range of the victim's IRDA device, usually within arm's length.
 - The attack would require that an attacker's machine's IRDA port
   have either a direct line of sight to the victim's machine, or
   be able to transmit the IRDA packets through reflection directly
   to the victim's IRDA port.
 - To the best of our knowledge, this cannot be used to run
   malicious code on the user's system.

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-046.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Paul Millar (paulm@astro.gla.ac.uk)

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

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

iQEVAwUBO4LBRI0ZSRQxA/UrAQG2NQgAr/eoEpI80b4atJ2T6Rhqg/21geyhlHL9
I0jiN8bP4RY76/K7tQZzAeBw4XFp7CZ8FQF+Xqq5CXCa7Qope+IFMq8V/UOAIWpn
AvJm9GNm0NV2MxRTsXmIXHyFOONrcWSASYwZBzbFR0Q+wiA5Icc9lUw8/yR4QbGa
xHv4lpIsnLnWSftLV9Yb294E/3vKzGWvO65a03qoRCgvwL+NZZ38N7jnHckPAynR
y0AvipDhvJu2YTQ4LcYTqMjVtI/zIRrbFAulu6B5G2xDZ6ELHxAFJu1hIVdw7aHL
riG87yJhLd2EZm8e3sknSooxsOrODBsdjNpMd6Zf/qBuWK7I13EZLA==
=lpaT
- -----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 original authors 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/Information/advisories.html

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 emergencies.

-----BEGIN PGP SIGNATURE-----
Version: 2.6.3i
Charset: noconv
Comment: ftp://ftp.auscert.org.au/pub/auscert/AUSCERT_PGP.key

iQCVAwUBO4N1Cih9+71yA2DNAQE2ZwP+PcLJKbvJHrg6Fr0qelVg8uLp7AVfAs61
tXl1ce1NCj3hPKJvIfFinTbz9OQ08A2ItK0Zltj6JCRnNqUJ1wGlskZRGFVABDLJ
1ajSrnIusICkwP1los8WdkKl7tHet6h606XtAYsnbWnkSGJM22n5beBRJxObN7EZ
DK1AaS58+ak=
=2quT
-----END PGP SIGNATURE-----