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Q188348: Specially-Malformed FTP Requests May Create Denial of Service

Article: Q188348
Product(s): Internet Information Server
Version(s): winnt:3.0,4.0
Operating System(s): 
Keyword(s): kbWinNT400sp5fix
Last Modified: 16-MAY-2002

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The information in this article applies to:

- Microsoft Internet Information Server versions 3.0, 4.0 
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SYMPTOMS
========

Specially-malformed FTP requests may create a Denial of Service in the FTP
service, which causes Internet Information Server (IIS) to stop responding and
generate an Access Violation error message.


RESOLUTION
==========


To resolve this problem, obtain the latest service pack for Windows NT 4.0 or the
individual software update. For information on obtaining the latest service
pack, please go to:

- http://www.microsoft.com/windows/servicepacks/

-or-

- Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack

For information on obtaining the individual software update, contact Microsoft
Product Support Services. 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


IIS 4.0
-------

The IIS 4.0 version of this hotfix must be installed over Windows NT 4.0 SP4. It
has been posted to the following Internet location as Ftpls4i.exe (x86) and
Ftpls4a.exe (Alpha):

  US English:
  ftp://ftp.microsoft.com/bussys/iis/iis-public/fixes/usa/security/ftpls-fix/

  French:
  ftp://ftp.microsoft.com/bussys/iis/iis-public/fixes/frn/security/ftpls-fix/

IIS 3.0
-------

The IIS 3.0 version of this hotfix must be installed over Windows NT 4.0 SP4. It
has been posted to the following Internet location as Ftpls3i.exe (x86) and
Ftpls3a.exe (Alpha):

  ftp://ftp.microsoft.com/bussys/iis/iis-public/fixes/usa/security/ftpls-fix/

STATUS
======

Microsoft has confirmed this to be a problem in Internet Information Server
versions 3.0 and 4.0. This problem was first corrected in Windows NT 4.0 Service
Pack 5.

Additional query words: IIS hotfix hot fix qfe quick engineering patch

======================================================================
Keywords          : kbWinNT400sp5fix 
Technology        : kbiisSearch kbiis400 kbiis300
Version           : winnt:3.0,4.0
Hardware          : ALPHA x86
Issue type        : kbbug
Solution Type     : kbfix

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