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Windows Remote Desktop Protocol Private Key Disclosure

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Description


Massimiliano Montoro has reported a security issue in Microsoft Windows, which can be exploited by malicious people to conduct MitM (Man-in-the-Middle) attacks.

The problem is that the private key used for signing a terminal server's public key is hard-coded into the mstlsapi.dll library. This can be exploited to calculate a valid signature, which can be used for performing MitM attacks.

Successful exploitation requires that a malicious person is able to intercept traffic between the terminal client and terminal server.

NOTE: Functionality for exploiting this has reportedly been included in Cain & Abel 2.7.


Solution:
Connect only to terminal services over trusted networks.

Provided and/or discovered by:
Massimiliano Montoro

Original Advisory:
Massimiliano Montoro:
http://www.oxid.it/downloads/rdp-gbu.pdf

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: Windows Remote Desktop Protocol Private Key Disclosure

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