SYMPTOMS
A denial-of-service vulnerability exists in the Windows 2000 Telnet service that can prevent an idle Telnet session from timing out. By starting as many sessions as the server could accommodate, and letting them idle in a particular way, an attacker could prevent other users from establishing Telnet sessions.
Mitigating Factors
- It would not be necessary to reboot the server to recover from this vulnerability. At worst, the Telnet service would need to be restarted.
- This vulnerability cannot be used to gain additional privileges on the computer; it is a denial-of-service vulnerability only.
RESOLUTION
To resolve this problem, either obtain Windows 2000 Service Pack 3 or Windows 2000 Security Rollup Package 1 (SRP1).
To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, click the following article number to view the article in the
Microsoft Knowledge Base:
260910 How to Obtain the Latest Windows 2000 Service Pack
For additional information about SRP1, click the article number below
to view the article in the Microsoft Knowledge Base:
311401 Windows 2000 Security Rollup Package 1 (SRP1), January 2002
The following file is available for download from the Microsoft Download Center:
Release Date: June 7, 2001
For additional information about how to download Microsoft Support files, click the following article number to view the article in the Microsoft Knowledge Base:
119591 How to Obtain Microsoft Support Files from Online Services
Microsoft scanned this file for viruses. Microsoft used the most current virus-detection software that was available on the date that the file was posted. The file is stored on security-enhanced servers that help to prevent any unauthorized changes to the file.
The English version of this fix should have the following file attributes or later:
Date Time Version Size File name
-----------------------------------------------------
05/24/2001 04:14p 5.0.33667.1 186,128 Tlntsvr.exe
