Q317196: MS02-018: Patch for Service Denial Through FTP Status Request

Article: Q317196
Product(s): Internet Information Server
Version(s): 4.0,5.0
Operating System(s): 
Keyword(s): kbSecurity kbWinNT400PreSP7Fix kbWin2000PreSP3Fix kbWinXPpreSP1fix kbWin2000sp3fix
Last Modified: 15-AUG-2002

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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 
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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 can only be exploited if the Web server is also configured to
provide File Transfer Protocol (FTP) services. IIS 4.0 installs FTP services by
default, but IIS 5.0 and 5.1 do not. The IIS Lockdown Tool disables FTP support
by default.

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.

CAUSE
=====

This vulnerability results because the FTP implementation in IIS 4.0, 5.0, and
5.1 does not correctly handle a request for the status of the connection if the
request has been malformed in a particular way. Receiving such a request results
in the failure of the IIS service.

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

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.

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/securit y/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 Datacenter Program and Windows 2000 Datacenter Server Product

For additional information on 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: kbIIS400500510April2002Rollup security_patch

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

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