Microsoft Security Bulletin MS03-003: Flaw in how Outlook 2002 handles V1 Exchange Server Security Certificates could lead to Information Disclosure (812262)

2003-01-23T00:00:00
ID SECURITYVULNS:DOC:4015
Type securityvulns
Reporter Securityvulns
Modified 2003-01-23T00:00:00

Description

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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.


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