Q314339: MS02-018: Patch for AV in URL Error Handling Vulnerability

Article: Q314339
Product(s): Internet Information Server
Version(s): 4.0,5.0
Operating System(s): 
Keyword(s): kbSecurity kbCOMIS kbWinNT400PreSP7Fix kbWin2000PreSP3Fix kbWinXPpreSP1fix kbWin2000sp3
Last Modified: 15-AUG-2002

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

- Microsoft Internet Information Services version 5.1 
- Microsoft Internet Information Services version 5.0 
- Microsoft Internet Information Server version 4.0 
-------------------------------------------------------------------------------

SYMPTOMS
========

A denial of service vulnerability exists in Internet Information Server (IIS)
4.0, Internet Information Services (IIS) 5.0, and IIS 5.1. By exploiting this
vulnerability, an attacker can temporarily prevent a Web server from providing
Web services.

This vulnerability does not allow any data on the system to be compromised, nor
does it enable the attacker to gain any rights on the system.

Microsoft investigations to date suggest that this vulnerability only occurs in
cases in which Front Page Server Extensions (FPSE) are installed on the system,
although it is possible that it may also occur under other conditions.

CAUSE
=====

This vulnerability occurs because IIS incorrectly handles the error condition
that results when one of the ISAPI filters that FPSE installs receives a Uniform
Resource Locator (URL) that exceeds the maximum permitted length. Although the
problem is with IIS, and therefore can also occur in cases that involve
additional Internet Server Application Programming Interface (ISAPI) filters,
Microsoft investigations to date have not revealed any other cases in which this
occurs.

RESOLUTION
==========

- Internet Information Services 5.1
- Internet Information Services 5.0
- Internet Information Server 4.0

Internet Information Services 5.1
---------------------------------

The update for this problem is included in the "MS02-018: April 2002 Cumulative
Patch for Internet Information Services". For additional information about how
to obtain this patch, click the article number below to view the article in the
Microsoft Knowledge Base:

  Q319733 MS02-018: April 2002 Cumulative Patch for Internet Information
  Services

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

The update for this problem is included in the "MS02-018: April 2002 Cumulative
Patch for Internet Information Services". For additional information about how
to obtain this patch, click the article number below to view the article in the
Microsoft Knowledge Base:

  Q319733 MS02-018: April 2002 Cumulative Patch for Internet Information
  Services

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

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

The update for this problem is included in the "MS02-018: April 2002 Cumulative
Patch for Internet Information Services". For additional information about how
to obtain this patch, click the article number below to view the article in the
Microsoft Knowledge Base:

  Q319733 MS02-018: April 2002 Cumulative Patch for Internet Information
  Services

STATUS
======

Internet Information Services 5.1
---------------------------------

Microsoft has confirmed that this problem may cause a degree of security
vulnerability in Microsoft Internet Information Services 5.1.

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

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

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

Microsoft has confirmed that this problem may cause a degree of security
vulnerability in Microsoft Internet Information Server 4.0.

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

For more information on these vulnerabilities, see the following Microsoft Web
site:

  http://www.microsoft.com/technet/security/bulletin/MS02-018.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 kbIIS400500510April2002Rollup security_patch

======================================================================
Keywords          : kbSecurity kbCOMIS kbWinNT400PreSP7Fix kbWin2000PreSP3Fix kbWinXPpreSP1fix kbWin2000sp3fix 
Technology        : kbiisSearch kbiis500 kbiis400 kbiis510
Version           : :4.0,5.0
Hardware          : x86
Issue type        : kbbug
Solution Type     : kbfix

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

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.

Copyright Microsoft Corporation 1986-2002.