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

- ----------------------------------------------------------------------
Title:      E-mail Header Processing Flaw Could Cause Outlook 2002
            to Fail (331866)
Date:       04 December 2002
Software:   Microsoft Outlook 2002
Impact:     Denial of Service
Max Risk:   Moderate
Bulletin:   MS02-067

Microsoft encourages customers to review the Security Bulletins at: 
http://www.microsoft.com/technet/security/bulletin/MS02-067.asp
http://www.microsoft.com/security/security_bulletins/MS02-067.asp
- ----------------------------------------------------------------------

Issue:
======
Microsoft Outlook provides users with the ability to work with
e-mail, contacts, tasks, and appointments. Outlook e-mail handling
includes receiving, displaying, creating, editing, sending, and
organizing e-mail messages. When working with received e-mail
messages, Outlook processes information contained in the header of
the e-mail which carries information about where the e-mail came
from, its destination, and attributes of the message.

A vulnerability exists in Outlook 2002 in its processing of e-mail
header information. An attacker who successfully exploited the
vulnerability could send a specially malformed e-mail to a user of
Outlook 2002 that would cause the Outlook client to fail under
certain circumstances. The Outlook 2002 client would continue to
fail so long as the specially malformed e-mail message remained on
the e-mail server. The e-mail message could be deleted by an e-mail
administrator, or by the user via another e-mail client such as
Outlook Web Access or Outlook Express, after which point the
Outlook 2002 client would again function normally.

Mitigating Factors:
====================
 - Outlook 2002 clients connecting to e-mail servers using the
   MAPI protocol are not affected. Only Outlook 2002 clients using
   POP3, IMAP, or WebDAV protocols are vulnerable.

 - The vulnerability does not affect Outlook 2000 or Outlook Express.

 - The vulnerability is a denial of service vulnerability only.
   The attacker would not be able to access the user?s e-mail or
   system in any way. The vulnerability could not be used to read,
   delete, create, or alter the user?s e-mail. 

 - If an attacker was able to send a specially malformed e-mail that
   successfully exploited this vulnerability, the specially
   malformed e-mail could be deleted either by an e-mail
   administrator, or by the user via another e-mail client such as
   Outlook Web Access or Outlook Express. Once the specially
   malformed e-mail has been removed, normal operation would resume.

Risk Rating:
============
 - Moderate

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the 
   Security Bulletin at
   http://www.microsoft.com/technet/security/bulletin/ms02-067.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Richard Lawley

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

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

iQEVAwUBPe5ejo0ZSRQxA/UrAQGGCwf/fCc/EakgoYYoT0CHxlWV/0xGi7N6/Dr6
d/eEhu8fYujZ2flicJOGD96wOBqhTJoabMNzMQVLQMswgRvvVLewnXolR6EhdGTN
AX+XuNYizNOdhJuc5GYHmOl6K9Dr3DnBObXXBf0YqDcdmHssx8XJ5sHKcf/eP/6K
t9HevpcNOamjtT20rvu0mcKkrFxb5uwGXWfFl+nHW7faPOp56JTyoKHkQjtLiq1c
33TeDGJOz3Gm6uLZU0juJ9UyNh0GqN2UqjrYn7sMRTOR1si0O/Qr16ZV6rD8Rhn8
V6pH36kXsj7CRVkYlXkEaFnmohy9fghkXTPLTG/DBxqupoI923ywhg==
=S3ww
-----END PGP SIGNATURE-----