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  Microsoft Outlook DoS

From:MICROSOFT <secure_(at)_microsoft.com>
Date:09.12.2002
Subject:Microsoft Security Bulletin MS02-067: E-mail Header Processing Flaw Could Cause Outlook 2002 to Fail (331866)

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

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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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