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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

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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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DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
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OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

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