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Denial-of-Service Attack on Port 1720 May Cause a Memory Leak in Conf.exe (Q299796)

The information in this article applies to:

  • Microsoft Windows versions 2000 , 2000 SP1 , 2000 SP2 , Professional
  • Microsoft Windows versions 2000 , 2000 SP1 , 2000 SP2 , Server
  • Microsoft Windows versions 2000 , 2000 SP1 , 2000 SP2 , Advanced Server


A port attack on port 1720, which is used by the Microsoft NetMeeting Remote Desktop Sharing (RDS) process, may cause a memory leak. When this occurs, Conf.exe consumes all available memory and 50 percent of the CPU usage.


A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems that are determined to be at risk of attack. Please evaluate your computer's physical accessibility, network and Internet connectivity, and other factors to determine the degree of risk to your computer. Please see the associated Microsoft Security Bulletin to help make this determination. This fix may receive additional testing at a later time, to further ensure product quality. If your computer is sufficiently at risk, Microsoft recommends that you apply this fix now. Otherwise, wait for the next Windows 2000 service pack that contains this fix.

To resolve this problem immediately, download the fix as instructed below or contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information on support costs, please go to the following address on the World Wide Web:
NOTE : In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

The following file is available for download from the Microsoft Download Center:
] Download Q299796_W2k_SP3_x86_en.exe now
Release Date: June 20, 2001

For additional information about how to download Microsoft Support files, click the article number below to view the article in the Microsoft Knowledge Base:
Q119591 How to Obtain Microsoft Support Files from Online Services
Microsoft used the most current virus detection software available on the date of posting to scan this file for viruses. Once posted, the file is housed on secure servers that 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
   5/24/2001  01:45p  392,976  Callcont.dl


Microsoft has confirmed that this problem could result in some degree of security vulnerability in Microsoft Windows 2000.


For more information on this vulnerability, click the following Microsoft web site:
For additional information about how to install Windows 2000 and Windows 2000 hotfixes at the same time, click the article number below to view the article in the Microsoft Knowledge Base:
Q249149 Installing Microsoft Windows 2000 and Windows 2000 Hotfixes

Published Jul 9 2001 8:22AM Issue Type kbbug
Last Modifed Aug 15 2001 6:23PM Additional Query Words security_patch
Keywords kbWin2000PreSP3Fix


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