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Microsoft Security Bulletin MS03-003: Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure (812262)
From: "Microsoft" <0_43316_04BF067D-4CF8-4245-B5C1-58573E5746A8_US () Newsletters Microsoft com>
Date: Wed, 22 Jan 2003 21:31:19 -0800
-----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.
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- Microsoft Security Bulletin MS03-003: Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure (812262) Microsoft (Jan 22)