Microsoft FrontPage Server Extensions Remote Debug Buffer Overrun Vulnerability



Date Discovered

November 11, 2003


Microsoft FrontPage Server Extensions are prone to a remotely exploitable buffer overrun vulnerability that is exposed via remote debugging functionality. It is possible to trigger this condition with a chunked-encoded HTTP POST request. This could be exploited to execute arbitrary code on a vulnerable system with Local System privileges.

Technologies Affected

  • Microsoft FrontPage Server Extensions 2000
  • Microsoft FrontPage Server Extensions 2002
  • Microsoft SharePoint Team Services 2002
  • Microsoft Windows 2000 Advanced Server SP2
  • Microsoft Windows 2000 Advanced Server SP3
  • Microsoft Windows 2000 Datacenter Server SP2
  • Microsoft Windows 2000 Datacenter Server SP3
  • Microsoft Windows 2000 Professional SP2
  • Microsoft Windows 2000 Professional SP3
  • Microsoft Windows 2000 Server SP2
  • Microsoft Windows 2000 Server SP3
  • Microsoft Windows XP 64-bit Edition SP1
  • Microsoft Windows XP Home SP1
  • Microsoft Windows XP Professional SP1


Block external access at the network boundary, unless external parties require service.
If the server is not intended to be accessed by external systems, use network access controls to restrict access to all but internal or trusted networks and hosts only. This will reduce exposure to this and other vulnerabilities.

Disable any services that are not needed.
Disable FrontPage Server Extensions if they are not explicitly required. This will eliminate exposure to latent vulnerabilities in the service.

Microsoft has released updates to address this issue. It should be noted that the fix entitled "Security Update for Microsoft FrontPage Server Extensions 2000" is not yet available for download at the time of writing.



Discovery is credited to Brett Moore.

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