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Patch Available for "Indexing Service File Enumeration" Vulnerability

The information in this article applies to:
  • Microsoft Windows versions 2000, 2000 SP1 Professional
  • Microsoft Windows versions 2000, 2000 SP1 Server
  • Microsoft Windows versions 2000, 2000 SP1 Advanced Server


Microsoft has released a patch that eliminates a security vulnerability in a component that is a part of Windows 2000. The vulnerability could allow a malicious Web site operator to learn the names and properties of files and folders on the computer of a visiting user.

An ActiveX control that is included as part of the Indexing Service is incorrectly marked as "safe for scripting." Because of this, the ActiveX control may be started by Web site programs. This control could be used to enumerate files and folders, and to view their properties. Note that it would not be necessary for the Indexing service to be running for the vulnerability to be exploited. However, if it were running, the control could also be used to search for files that contain specific words. The vulnerability could not be used to read files, except by using a scenario that is described in the following Microsoft Security Bulletin:
The vulnerability could not be used to change, add, or delete information on your computer.

NOTE: A patch has been provided for the Indexing service version 3.0, but not for Index Server 2.0. This is primarily due to the different delivery methods that are used for these two products. Indexing service 3.0 is included as a part of all versions of Windows 2000, and because of this, the vulnerability could affect all Windows 2000 users. However, Index Server 2.0 is included as a part of the Windows NT 4.0 Option Pack. Because of this, to be affected by the vulnerability in Index Server 2.0, a Web master would need to browse untrusted Internet sites from his own Web server, and this is contrary to normal recommended practices.


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:
The following file is available for download from the Microsoft Download Center:
[GRAPHIC: Download]Download Q280838_W2K_SP2_x86_en.exe now
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
   11/28/2000  11:31p  5.0.2195.2787  49,936  Ixsso.dll 


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


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

Additional query words:

Keywords : kbWin2000PreSP2Fix
Issue type : kbbug
Technology : kbwin2000AdvServ kbwin2000AdvServSearch kbwin2000S kbwin2000Ssearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro

Last Reviewed: January 30, 2001
© 2001 Microsoft Corporation. All rights reserved. Terms of Use.

Article ID: Q280838

Last Reviewed:
January 30, 2001

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