Security Bulletin MS01-006

2001-02-01T00:00:00
ID SECURITYVULNS:DOC:1235
Type securityvulns
Reporter Securityvulns
Modified 2001-02-01T00:00:00

Description


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.


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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