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Q260069: Malformed HTR Request Returns Source Code for ASP Scripting File

Article: Q260069
Product(s): Internet Information Server
Version(s): 4.0,5.0
Operating System(s): 
Keyword(s): kbWinNT400PreSP7Fix kbWin2000PreSP2Fix kbWin2000SP2Fix kbgraphxlinkcritical
Last Modified: 08-MAY-2002

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
- Microsoft Internet Information Server version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

A malformed HTR request may cause the source code of the Active Server Pages
(ASP) script file to be returned.


CAUSE
=====

The problem occurs because the CreateFile function that is used to open
requested files deletes all of the trailing spaces in a file name. The file-name
truncation in the CreateFile function causes the two names
"C:\Ineptub\Wwroot\Default.asp" and "C:\Ineptub\Wwroot\Default.asp<followed
by several blank spaces>" to be the same, which causes the source code of the
Default.asp file to be opened and be returned.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Windows 2000. For
additional information, please see the following article in the Microsoft
Knowledge Base:

  Q260910 How to Obtain the Latest Windows 2000 Service Pack

Windows 2000:

The following file is available for download from the Microsoft Download Center:

  DownloadDownload Q267559_w2k_sp2_x86_en.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=22708)

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. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.

For additional information about what this package fixes, click the article
numbers below to view the articles in the Microsoft Knowledge Base:

  Q267560 Changing the URL in a Specific Manner May Expose Contents of a File

  Q267559 GET on .Htr File Can Cause a "Denial of Service" or Enable Directory
  Browsing

  Q260838 IIS Stops Servicing .htr Requests

The English version of this fix should have the following file attributes or
later:

  Date        Time    Version         Size    File name
  -----------------------------------------------------
  07/07/2000  03:17p  5.00.2195.2100  46,352  Ism.dll


Windows NT 4.0

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 experiencing this specific problem.

To resolve this problem, 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:

  http://support.microsoft.com/default.aspx?scid=fh;EN-US;CNTACTMS

NOTE: In special cases, charges that are normally incurred for support calls may
be canceled, if a Microsoft Support Professional determines that a specific
update will resolve your problem. Normal support costs will apply to additional
support questions and issues that do not qualify for the specific update in
question.

The following files are available for download from the Microsoft Download
Center:

  x86: DownloadDownload Htrdos4i.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=22709)

  x86 Symbols: DownloadDownload Htrdos4is.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=22709)

  Alpha: DownloadDownload Htrdos4a.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=22709)

  Alpha Symbols: DownloadDownload Htrdos4as.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=22709)

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. After it is posted, the file is housed on
secure servers that prevent any unauthorized changes to the file.

For additional information about what this package fixes, click the article
numbers below to view the articles in the Microsoft Knowledge Base:

  Q267560 Changing the URL in a Specific Manner May Expose Contents of a File

  Q267559 GET on .Htr File Can Cause a "Denial of Service" or Enable Directory
  Browsing

  Q260838 IIS Stops Servicing .htr Requests

The English version of this fix should have the following file attributes or
later:

  Date        Time    Version    Size    File name  Platform
  ----------------------------------------------------------
  06/28/2000  09:34p  4.2.748.1  54,544  Ism.dll    x86
  06/28/2000  09:30p  4.02.0748  84,752  Ism.dll    Alpha



STATUS
======

This problem was first corrected in Windows 2000 Service Pack 2.

Internet Information Services 5.0
---------------------------------

Microsoft has confirmed this to be a problem in Internet Information Services
5.0.

Internet Information Server 4.0
-------------------------------

Microsoft has confirmed this to be a problem in Internet Information Server 4.0.

MORE INFORMATION
================

For related information about this problem, please visit the following Microsoft
Web site:

  http://www.microsoft.com/technet/security/bulletin/ms00-031.asp

For additional security-related information about Microsoft products, please
visit the following Microsoft Web site:

  http://www.microsoft.com/security/

For additional information about other issues that are resolved by this update,
click the article number below to view the article in the Microsoft Knowledge
Base:

  Q260838 IIS Stops Servicing .htr Requests

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          : kbWinNT400PreSP7Fix kbWin2000PreSP2Fix kbWin2000SP2Fix kbgraphxlinkcritical 
Technology        : kbiisSearch kbiis500 kbiis400
Version           : :4.0,5.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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

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