ITinfo: Microsoft Web Outlook Security Hole

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Wide Open Web Outlook

Microsoft's product posts your e-mail to the net

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Microsoft Web Outlook Security Hole

by Dave Murphy
ISSN 1535-3613

Microsoft has confirmed that the Exchange 5.5 e-mail system allows unauthorized access to user's mailboxes through flaw in the Outlook Web Access module. The module mishandles inline script in HTML e-mail messages. Full control over a mailbox is granted with an e-mail message with improperly embedded code is opened through Internet Explorer.

The malicious attacker can delete mail, move messages, and send messages as if he were the mailbox owner.

Dave's Opinion

The Web Outlook application is a great idea that's poorly implemented. I like being able to get to my mail from a web browser. But the security in Web Outlook is unacceptable. I use a different application to get to my mail through the web, and I'd never consider using Microsoft's remote email application.

Remote mail access is handy when I travel. For example, I kept in contact with clients during a recent extended trip. A couple of times a week I stopped at the local library, logged onto the web, checked my mail (deleted hundreds of spam messages), and responded to the most burning issues. I didn't have fast Internet access in our villa, and with a couple of hot projects going I couldn't stay incommunicado for more than a few days. The web-accessible email was a savior.

Call for Comments

What do you think? Leave your comments on the message center.

References

Microsoft Security Bulletin
Message Center

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http://itrain.org/itinfo/2001/it011207.html
updated December 7, 2001