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Q260347: MS00-060: IIS 4: Fix for Cross-Site Scripting Issues

Article: Q260347
Product(s): Internet Information Server
Version(s): 4.0
Operating System(s): 
Keyword(s): kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical
Last Modified: 08-MAY-2002

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The information in this article applies to:

- Microsoft Internet Information Server version 4.0 
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On November 2, 2000, Microsoft released an updated patch to correct a new variant of this vulnerability. Please see the Resolution section below for information on how to obtain the latest patch.

For additional information about resolving this problem on IIS 5, click the article number below 
to view the article in the Microsoft Knowledge Base:

  Q275657 IIS 5: Fix for Cross-Site Scripting Issues

SYMPTOMS
========

Microsoft has identified a vulnerability that could enable a malicious user to
cause code to run on the computer of another user in the guise of a third-party
web site. Such code could take any action on the user's computer that the
third-party web site was permitted to take. In addition, the code could be made
persistent, so that if the user returned to the web site again in the future,
the code would begin running again.

The vulnerability could only be exploited if the user clicked on a hypertext
link, either in an HTML mail or on a malicious user's web site - the code could
not be "injected" into an existing session.

CAUSE
=====

Certain Web services provided by Internet Information Server 4.0 do not properly
validate all inputs before they use them, and are therefore vulnerable to
Cross-Site Scripting (CSS).

RESOLUTION
==========

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.

To resolve this problem, obtain the Windows NT 4.0 Security Rollup Package. For
additional information, click the article number below to view the article in
the Microsoft Knowledge Base:

  Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP)

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

  DownloadDownload Crsscri.exe now
  (http://www.microsoft.com/downloads/release.asp?ReleaseID=25534)

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.

  Date       Time    Version      Size    File name     Platform
  --------------------------------------------------------------
  10/03/2000  09:03p  4.2.752.1  214,544  adsiis.dll    x86
  10/03/2000  09:03p  4.2.752.1  330,080  asp.dll       x86
  10/03/2000  08:13p              11,396  httpext.h     x86
  10/03/2000  09:02p  4.2.752.1   55,904  httpodbc.dll  x86
  10/03/2000  09:03p  4.2.752.1   98,912  iischema.dll  x86
  10/03/2000  08:13p              28,851  iiscnfg.h     x86
  10/03/2000  09:01p  4.2.752.1  185,792  infocomm.dll  x86
  10/03/2000  09:05p  4.2.752.1   54,560  ism.dll       x86
  10/03/2000  09:02p  4.2.752.1   38,256  ssinc.dll     x86
  10/03/2000  09:02p  4.2.752.1   25,360  sspifilt.dll  x86
  10/03/2000  09:02p  4.2.752.1  229,008  w3svc.dll     x86



Microsoft Windows NT Server version 4.0, Terminal Server Edition
----------------------------------------------------------------

To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server
Edition, Security Rollup Package (SRP). For additional information about the
SRP, click the article number below to view the article in the Microsoft
Knowledge Base:

  Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup
  Package

STATUS
======

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

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

For more information on this security vulnerability, please see the following
Microsoft web site:

  http://www.microsoft.com/technet/security/bulletin/MS00-060.asp

CSS is a recently discovered security vulnerability that potentially enables a
malicious user to "inject" code into a user's session with a Web site. Unlike
most security vulnerabilities, CSS does not apply to any single vendor's
products, but instead, it can affect any software that runs on a Web server and
does not follow defensive programming practices. In early 2000, Microsoft and
CERT worked together to inform the software industry of the issue and lead an
industry-wide response to it.

Microsoft published extensive information about CSS, including information for
developers on how to check their code for potential vulnerabilities. Microsoft
has identified several places in IIS where proper checking was not performed;
some of these were found by our internal security teams, and others were
identified by customers.

For more specific information about CSS, see the FAQ on the following Web site:

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

Additional query words: Patch Available for "IIS Cross-Site Scripting" Vulnerabilities security_patch

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Keywords          : kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical 
Technology        : kbiisSearch kbiis400
Version           : :4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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