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Q294774: ISAPI Extension In-Process w/ Application Marked High Isolation

Article: Q294774
Product(s): Internet Information Server
Version(s): 5.0
Operating System(s): 
Keyword(s): kbSecurity kbCOMIS kbWin2000PreSP3Fix KbSECVulnerability KbSECHack kbWin2000sp3fix
Last Modified: 15-AUG-2002

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The information in this article applies to:

- Microsoft Internet Information Services version 5.0 
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SYMPTOMS
========

If an ISAPI DLL has the same name as a DLL that is listed in the
InProcessIsapiApps metabase entry, Internet Information Services (IIS) loads the
ISAPI extension in-process even when the Application is marked for High
Isolation.

CAUSE
=====

When IIS reads the list of InProcessIsapiApps from the metabase, it makes two
copies of each entry: one copy of the entire path and one copy of only the DLL.
This allows for relative path matching.

RESOLUTION
==========

To resolve this problem, either obtain the hotfix referenced in this section or
Windows 2000 Security Rollup Package 1 (SRP1). For additional information about
SRP1, click the article number below to view the article in the Microsoft
Knowledge Base:

  Q311401 Windows 2000 Security Rollup Package 1 (SRP1), January 2002

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

  Q260910 How to Obtain the Latest Windows 2000 Service Pack

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

  DownloadDownload Q301625_W2K_SP3_x86_en.exe now
  (http://www.microsoft.com/Downloads/Release.asp?ReleaseID=32011)

NOTE: This patch can be installed on systems running Windows 2000 Service Pack 1
or Windows 2000 Service Pack 2. You must reapply the security rollup patch after
you install a Windows 2000 Service Pack.

Release Date: August 15, 2001

For additional information about how to download Microsoft Support files, click
the following article number to view the article in the Microsoft Knowledge
Base:

  Q119591 How to Obtain Microsoft Support Files from Online Services

Microsoft scanned this file for viruses. Microsoft used the most current
virus-detection software that was available on the date that the file was
posted. The file is stored 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
  ----------------------------------------------------
  31-May-2001 15:32  5.0.2195.3649  353,040  W3svc.dll


STATUS
======

Microsoft has confirmed that this problem may cause a degree of security
vulnerability in Internet Information Services 5.0. This problem was first
corrected in Windows 2000 Service Pack 3.

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

This patch also contains fixes for the problems described in the following
Microsoft Knowledge Base article:

  Q297860 IIS 5.0 Security and Post-Windows NT 4.0 SP5 IIS 4.0 Patch Rollup

For more information on this vulnerability, see the following Microsoft Web
site:

  http://www.microsoft.com/technet/security/bulletin/ms01-044.asp

For additional information about how to obtain a hotfix for Windows 2000
Datacenter Server, click the article number below to view the article in the
Microsoft Knowledge Base:

  Q265173 The Datacenter Program and Windows 2000 Datacenter Server Product

For additional information about how to install multiple hotfixes with only one
reboot, click the article number below to view the article in the Microsoft
Knowledge Base:

  Q296861 Use QChain.exe to Install Multiple Hotfixes with One Reboot

Additional query words: kbIISCom security_patch kbWin2000srp1

======================================================================
Keywords          : kbSecurity kbCOMIS kbWin2000PreSP3Fix KbSECVulnerability KbSECHack kbWin2000sp3fix 
Technology        : kbiisSearch kbiis500
Version           : :5.0
Hardware          : x86
Issue type        : kbbug
Solution Type     : kbfix

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

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