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Microsoft Security Bulletin MS00-036

Patch Available for 'ResetBrowser Frame' and 'HostAnnouncement Frame' Vulnerabilities

Originally posted: May 25, 2000


Microsoft has released a patch that eliminates two security vulnerabilities, one affecting Microsoft® Windows NT® 4.0 and Windows® 2000, and the other affecting Windows NT 4.0 only. Under certain conditions, the vulnerability could allow a malicious user to make it difficult or impossible for other users to locate services and computers on a network; in the worst case, it could allow him to provide incorrect information about the same services and computers.

Affected Software:

  • Microsoft Windows NT 4.0 Workstation
  • Microsoft Windows NT 4.0 Server
  • Microsoft Windows NT 4.0 Server, Enterprise Edition
  • Microsoft Windows 2000 Professional
  • Microsoft Windows 2000 Server
  • Microsoft Windows 2000 Advanced Server

    NOTE: Windows 95, Windows 98, and Windows NT 4.0 Server, Terminal Server Edition, also provide an implementation of the Computer Browser protocol. However, they are not listed as affected products because the scenario in which these vulnerabilities could be exploited - large networks that rely on computer browsing - are exactly the ones most unlikely to use Windows 95, Windows 98 or Windows NT 4.0 Terminal Servers as master browsers.

Vulnerability Identifiers

General Information

Technical details

Frequently asked questions

Patch availability

Other information:


Microsoft thanks  the following people for working with us to protect customers:

  • COVERT Labs at McAfee, for reporting the "ResetBrowser Frame" vulnerability to us.
  • David Litchfield of Cerberus Information Security, Ltd, for reporting the "HostAnnouncement Flooding" vulnerability to us.

Support: This is a fully supported patch. Information on contacting Microsoft Product Support Services is available at .

Security Resources: The Microsoft TechNet Security Web Site provides additional information about security in Microsoft products.


The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.


  • May 25, 2000: Bulletin Created.