DOCUMENT:Q317196 15-AUG-2002 [iis] TITLE :MS02-018: Patch for Service Denial Through FTP Status Request PRODUCT :Internet Information Server PROD/VER::4.0,5.0 OPER/SYS: KEYWORDS:kbSecurity kbWinNT400PreSP7Fix kbWin2000PreSP3Fix kbWinXPpreSP1fix kbWin2000sp3fix ====================================================================== ------------------------------------------------------------------------------- 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 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 ====================================================================== Keywords : kbSecurity 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 2002.