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Title: Patch Available for "Invalid RDP Data" Vulnerability
Date: 31 January 2001
Software: Windows 2000 Terminal Services
Impact: Denial of Service
Bulletin: MS01-006
KB Article: Q286132 (Available Soon)

Microsoft encourages customers to review the Security Bulletin at:
http://www.microsoft.com/technet/security/bulletin/MS01-006.asp.
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Issue:
======
The implementation of the Remote Data Protocol (RDP) in Windows 2000
Terminal Service does not correctly handle a particular series of
data packets. If such a series of packets were received by an
affected server, it would cause the server to fail. The server could
be put back into normal service by rebooting it, but any work in
progress at the time of the attack would be lost.

It would not be necessary for an attacker to be able to start a
session with an affected server in order to exploit this
vulnerability - he would only need the ability to send the correct
series of packets to the RDP port on the server. The specific
sequence of data packets involved in this vulnerability cannot be
generated as part of a legitimate terminal server session. Windows NT
4.0 terminal servers are not affected by this vulnerability.

Mitigating Factors:
====================
 - Port 3389 is typically blocked at firewall. If this is done,
   the vulnerability could not be exploited from the Internet.
 - Vulnerability does not affect Windows 2000 servers that are
   not running Terminal Services.

Patch Availability:
===================
 - A patch is available to fix this vulnerability. Please read the
   Security Bulletin
   http://www.microsoft.com/technet/security/bulletin/ms01-006.asp
   for information on obtaining this patch.

Acknowledgment:
===============
 - Yoichi Ubukata and Yoshihiro Kawabata

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