Microsoft KB Archive/299553

= MS01-031: Logon Command That Contains a Particular Malformation Causes an Access Violation in the Telnet Service =

Article ID: 299553

Article Last Modified on 2/19/2007

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APPLIES TO


 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Advanced Server
 * Microsoft Windows 2000 Service Pack 1
 * Microsoft Windows 2000 Service Pack 2

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This article was previously published under Q299553



SYMPTOMS
A denial-of-service vulnerability exists in the Windows 2000 Telnet service that is caused by the manner in which Telnet handles a logon command that contains a particular deformity. If an attacker entered such a command, it would cause the Telnet service to stop working. The administrator could restore normal service by restarting the Telnet session.

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, 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

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



STATUS
Microsoft has confirmed that this problem may cause a degree of security vulnerability in Microsoft Windows 2000. This problem was first corrected in Windows 2000 Service Pack 3.



MORE INFORMATION
For additional information about how to obtain a hotfix for Windows 2000 Datacenter Server, click the article number below to view the article in the Microsoft Knowledge Base:

265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one reboot, click the article number below to view the article in the Microsoft Knowledge Base:

296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

For additional information about what is fixed by this patch, click the article number below to view the article in the Microsoft Knowledge Base:

300855 Windows 2000 Telnet Security Rollup

For more information about this vulnerability, see the following Microsoft Web site:

http://www.microsoft.com/technet/security/bulletin/MS01-031.mspx

Additional query words: security_patch DoS AV kbWin2000srp1 kbsecvulnerability kbsechack kbsecdos

Keywords: kbbug kbfix kbwin2000presp3fix kbqfe kbwin2000sp3fix kbsecurity kbhotfixserver KB299553

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