Computer Security
[EN] securityvulns.ru no-pyccku


Related information

  Microsoft Outlook 2000 V1 Exchange server certificates flaw

From:MICROSOFT <secure_(at)_microsoft.com>
Date:23.01.2003
Subject:Microsoft Security Bulletin MS03-003: Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure (812262)

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

- ----------------------------------------------------------------------
Title:      Flaw in how Outlook 2002 handles V1 Exchange Server
           Security Certificates could lead to Information
           Disclosure (812262)
Date:       22 January 2002
Software:   Microsoft Outlook 2002
Impact:     Information Disclosure
Max Risk:   Moderate
Bulletin:   MS03-003

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/MS03-003.asp
http://www.microsoft.com/security/security_bulletins/MS03-003.asp
- ----------------------------------------------------------------------

Issue:
======
Microsoft Outlook 2002 provides the facility to encrypt e-mails
sent between e-mail recipients. Encryption is used to prevent
parties other than the intended recipients from reading the
contents of an e-mail. Outlook uses public key certificates to
facilitate the exchange of the cryptographic keys that are used in
the encryption process, and Outlook offers a number of different
options as to what type of certificates can be used. S/MIME
certificates are the most commonly used (and are not affected by
the vulnerability that is the subject of this bulletin), but there
are other certificate options including V1 Exchange Server Security
certificates.

A vulnerability exists because there is a flaw in the way Outlook
2002 handles a V1 Exchange Server Security certificate when using
it to encrypt e-mail. As a result of this flaw, Outlook fails to
encrypt the mail correctly and the message will be sent in plain
text. This could cause the information in the e-mail to be exposed
when the user believed it to be protected through encryption.

Mitigating Factors:
====================
- -This vulnerability only affects encryption when a V1 Exchange
Server Security certificate is used. S/MIME encryption, which is
the most widely used form of e-mail encryption used by Outlook, is
not affected.

- -This vulnerability only affects Outlook 2002 and only when sending
HTML e-mail.

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

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
  Security Bulletins at
  http://www.microsoft.com/technet/security/bulletin/ms03-003.asp
  http://www.microsoft.com/security/security_bulletins/ms03-003.asp

  for information on obtaining this patch.

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

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

iQEVAwUBPi7gTI0ZSRQxA/UrAQEbGQf/V39gOIlQ72b4qzD97Mis6g3K673pH+VY
2KKECb+/VhXGb0qFJVkny8OIGtLeI+ks28NGzJSD+O/kuxIY6NijWupVOLNIu87k
qqSbq7O2EEyfYm18m8uxDX7wU5W8sDtamnd8zoVLt07kbD+bC8pwJmMiKjOPiIf+
9oa/VtC59PF1C27i/UgbOzd0PSAsdzneL4kz+8WcYwvkd5NfVlbQLZuBlXNf3K92
Ku9cl2qJLCOkcwbyGQ6sM8uH4lqIX3uqz4Ftn+7q494pecuaKglRYDPGe0/5OiUT
eLv7pzVZ57i0PlwNPuudNXjckSoox3b6Nt21J8naHUTGHq4YoaIeWQ==
=k8/K
-----END PGP SIGNATURE-----



*******************************************************************

You have received this e-mail bulletin because of your subscription to the Microsoft Product
Security Notification Service.  For more information on this service, please visit
http://www.microsoft.com/technet/security/notify.asp.

To verify the digital signature on this bulletin, please download our PGP key at
http://www.microsoft.com/technet/security/notify.asp.

To unsubscribe from the Microsoft Security Notification Service, please visit the Microsoft
Profile Center at http://register.microsoft.com/regsys/pic.asp

If you do not wish to use Microsoft Passport, you can unsubscribe from the Microsoft
Security Notification Service via email as described below:
Reply to this message with the word UNSUBSCRIBE in the Subject line.

For security-related information about Microsoft products, please visit the Microsoft
Security Advisor web site at http://www.microsoft.com/security.

About | Terms of use | Privacy Policy
© SecurityVulns, 3APA3A, Vladimir Dubrovin
Nizhny Novgorod