DOCUMENT:Q188348 16-MAY-2002 [iis] TITLE :Specially-Malformed FTP Requests May Create Denial of Service PRODUCT :Internet Information Server PROD/VER:winnt:3.0,4.0 OPER/SYS: KEYWORDS:kbWinNT400sp5fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server versions 3.0, 4.0 ------------------------------------------------------------------------------- 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 ============================================================================= 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 2002.