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Windows 2000 Still Image Service Exposes User Elevation Vulnerability

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


The Still Image service that is included with Windows 2000 exposes a vulnerability that could enable a standard user to escalate his or her local privilege level to System. A malicious user could use this vulnerability to potentially cause damage.


The Still Image service creates a window on the logged-on user's desktop that responds to a number of WM_USER messages by using the Post Message call. The window procedure is located in the service process, and can be controlled to some extent by the logged-on user. Also, there is a buffer overflow condition in one of the WM_USER messages.


A supported fix that corrects this problem is now available from Microsoft, but it has not been fully regression tested and should be applied only to computers that are experiencing this specific problem. If you are not severely affected by this specific problem, Microsoft recommends that you wait for the next Windows 2000 service pack that contains this fix.

To resolve this problem immediately, contact Microsoft Product Support Services to obtain the fix. For a complete list of Microsoft Product Support Services phone numbers and information about 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. Click the file name below to download the file:
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
   8/30/00  10:11PM  5.0.2195.2104  61,712  Stisvc.exe 


Microsoft has confirmed this to be a problem in Windows 2000.


For additional information about this vulnerability, see the following Microsoft Web site:
The Still Image service is not installed or started by default in Windows 2000. The service is added and started automatically if you add a scanner or camera in the Add/Remove Hardware Wizard.

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 : kbwin2000AdvSer kbwin2000AdvSerSearch kbwin2000S kbwin2000Ssearch kbwin2000Search kbwin2000ProSearch kbwin2000Pro

Last Reviewed: December 5, 2000
2000 Microsoft Corporation. All rights reserved. Terms of Use.

Article ID: Q272736

Last Reviewed:
December 5, 2000

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