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Insecure Library Loading
Not critical

Microsoft Outlook Express "BCC:" Recipient Disclosure Weakness

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Release Date:  2004-08-25    Last Update:  2004-12-30    Views:  36,453

Secunia Advisory SA12376

Where:

From remote

Impact:

Exposure of sensitive information

Solution Status:

Vendor Patch

CVE Reference(s):

No CVE references.

Description


Juha-Matti Laurio has reported a weakness in Outlook Express, which may disclose email addresses in "BCC:" fields to other recipients.

The weakness is caused due to an error when sending multipart messages. This may allow recipients in the "To:" and "CC:" fields to see the email addresses of recipients in the "BCC:" field.

In Outlook Express, this requires users to open the email message in a editor. In Lotus Notes and certain web-based email applications, the "BCC:" recipients are displayed directly in the message body without having to open it in an editor.

Successful exploitation requires that the user sending the email has configured Outlook Express to break apart emails larger than a size specified with the "Break apart messages larger than" setting (not enabled by default) for the used email account.


Solution:
An update is available via the Microsoft Windows Update web site.

Further details available to Secunia VIM customers

Provided and/or discovered by:
Juha-Matti Laurio

Original Advisory:
Microsoft Knowledge Base Article - 843555:
http://support.microsoft.com/kb/843555

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: Microsoft Outlook Express "BCC:" Recipient Disclosure Weakness

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