DOCUMENT:Q275657 08-MAY-2002 [iis] TITLE :IIS 5.0 Fix for Cross-Site Scripting Issues PRODUCT :Internet Information Server PROD/VER::5.0 OPER/SYS: KEYWORDS:kbWin2000PreSP2Fix kbWin2000SP2Fix kbgraphxlinkcritical ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== Microsoft has identified a vulnerability that may enable a malicious user to cause code to run on the computer of another user through a third-party Web site. Such code can take any action on the user's computer that the third-party Web site was permitted to take. In addition, the code can be made persistent, so that if the user returns to the Web site again, the code begins to run again. This vulnerability can only be exploited if the user clicks on a hypertext link, either in HTML e-mail or on a malicious user's Web site; the code cannot be injected into an existing session. CAUSE ===== Certain Web services provided by Internet Information Services 5.0 do not properly validate all inputs before they use them, and are therefore vulnerable to Cross-Site Scripting (CSS). RESOLUTION ========== To resolve this problem, obtain the latest service pack for Windows 2000. For additional information, please see the following article in the Microsoft Knowledge Base: Q260910 How to Obtain the Latest Windows 2000 Service Pack On November 2, 2000, Microsoft released an updated patch to correct a new variant of this vulnerability. See the following for information on how to obtain the latest patch. The following file is available for download from the Microsoft Download Center: DownloadDownload Q275657_W2K_SP2_x86_en.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=25533) 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. The English version of this fix should have the following file attributes or later: Date Time Version Size File name -------------------------------------------------------- 08/26/2000 06:30p 6,512 Fixerr.js 08/27/2000 11:41p 5.0.2195.2104 57,104 Httpodbc.dll 09/21/2000 05:23p 5.0.2195.2287 122,640 Iisrtl.dll 09/28/2000 05:54p 5.0.2195.2363 46,352 Ism.dll 08/27/2000 11:41p 5.0.2195.2104 41,744 Ssinc.dll For additional information about resolving this problem in Internet Information Server (IIS) 4.0, click the article number below to view the article in the Microsoft Knowledge Base: Q260347 IIS 4: Fix for Cross-Site Scripting Issues STATUS ====== Microsoft has confirmed this to be a problem in Internet Information Services 5.0. This problem was first corrected in Windows 2000 Service Pack 2. 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 can potentially enable 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 about how to check their code for potential vulnerabilities. Microsoft has identified several places in IIS where proper checking was not performed; some of these have been found by our internal security teams, and others were identified by customers. Additional query words: Patch Available for "IIS Cross-Site Scripting" Vulnerabilities ====================================================================== Keywords : kbWin2000PreSP2Fix kbWin2000SP2Fix kbgraphxlinkcritical Technology : kbiisSearch kbiis500 Version : :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.