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Microsoft Security Bulletin (MS00-058)

- --------------------------------------



Patch Available for "Specialized Header" Vulnerability

Originally posted: August 14, 2000



Summary

=======

Microsoft has released a patch that eliminates a security

vulnerability in Internet Information Server that ships with

Microsoft(r) Windows 2000. Under certain conditions, the

vulnerability could cause a web server to send the source code of

certain types of web files to a visiting user.



Frequently asked questions regarding this vulnerability and the patch

can be found at

http://www.microsoft.com/technet/security/bulletin/fq00-058.asp



Issue

=====

If an IIS server receives a file request that contains a specialized

header as well as one of several particular characters at the end,

the expected ISAPI extension processing may not occur. The result is

that the source code of the file would be sent to the browser.



It is important to note that normal security recommendations militate

strongly against ever including sensitive information in .ASP files

and, if these recommendations have been followed, there would be no

sensitive information to compromise. The specialized header at issue

here cannot be created via a standard Internet browser, so the

request would need to be created by an alternate method.



Affected Software Versions

==========================

 - Microsoft Internet Information Server 5.0



Patch Availability

==================

 - http://www.microsoft.com/Downloads/Release.asp?ReleaseID=23769



Note: This vulnerability is eliminated by installing Windows 2000

Service Pack 1

http://www.microsoft.com/windows2000/downloads/recommended/sp1/

We recommend that customers apply SP1 as the preferred option for

eliminating this vulnerability, as it has been fully regression

tested and includes fixes for additional issues.



Note: Additional security patches are available at the Microsoft

Download Center



More Information

================

Please see the following references for more information related to

this issue.

 - Frequently Asked Questions: Microsoft Security Bulletin MS00-058,

   http://www.microsoft.com/technet/security/bulletin/fq00-058.asp

 - Microsoft Knowledge Base article Q256888 discusses this issue

   and will be available soon.

 - Microsoft TechNet Security web site,

   http://www.microsoft.com/technet/security/default.asp

 - Obtaining Support on this Issue

 - This is a fully supported patch. Information on contacting

   Microsoft Product Support Services is available at

   http://support.microsoft.com/support/contact/default.asp.



Revisions

=========

August 14, 2000: Bulletin Created.



- --------------------------------------------------------

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.



(c) 2000 Microsoft Corporation. All rights reserved. Terms of use.



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