Title: Invalid RDP Data Can Cause Terminal Service Failure
Date: 18 October 2001
Software: Windows NT 4.0 Server, Terminal Server Edition, Windows 2000 Server and Advanced Server
Impact: Denial of service
Risk: Moderate
For a more detailed description of the issue adressed Read More...



Issue: The implementation of the Remote Data Protocol (RDP) in the terminal service in Windows NT 4.0 and Windows 2000 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 - the only prerequisite would be the need to be able to send the correct series of packets to the RDP port on the server. Mitigating Factors: - There is no capability to breach the security of a terminal server session via this vulnerability, or to add, change or delete data on the server. It is a denial of service vulnerability only.
- The specific sequence of data packets involved in this vulnerability cannot be generated as part of a legitimate terminal server session. Risk Rating: - Internet systems: Low
- Intranet systems: Moderate
- Client systems: None
Patch Availability: - A patch is available to fix this vulnerability. Please read the Security Bulletin MS01-052 for information on obtaining this patch.

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