Vulnerability Note VU#389795

Overview

Windows Phone 7 does not check CN (Common Name) of server certificates when receiving or sending e-mails using POP3/IMAP/SMTP servers using SSL.

Description

Windows Phone 7 fails to check the CN (Common Name) of server certificates when receiving or sending e-mails using POP3/IMAP/SMTP servers using SSL allowing an attacker to perform a man-in-the-middle attack between the phone and the mail server.

Impact

A remote attacker with the ability to pose as a man-in-the-middle may be able to view the login or session data in the corresponding protocol (e.g., SMTP, POP3, etc.).

Solution

Microsoft has acknowledged this vulnerability and stated that they will be releasing an update.

Vendor Information (Learn More)

Vendor	Status	Date Notified	Date Updated
Microsoft Corporation	Affected	19 Jun 2012	10 Sep 2012

If you are a vendor and your product is affected, let us know.

CVSS Metrics (Learn More)

Group	Score	Vector
Base	5.4	AV:N/AC:H/Au:N/C:C/I:N/A:N
Temporal	4.4	E:POC/RL:U/RC:UC
Environmental	4.6	CDP:LM/TD:M/CR:ND/IR:ND/AR:ND

References

• http://www.microsoft.com/windowsphone/en-us/default.aspx

Credit

Thanks to the reporter that wishes to remain anonymous.

This document was written by Michael Orlando.

Other Information

• CVE IDs: CVE-2012-2993
• Date Public: 17 Sep 2012
• Date First Published: 17 Sep 2012
• Date Last Updated: 17 Sep 2012
• Document Revision: 11