DOCUMENT:Q260347 08-MAY-2002 [iis] TITLE :MS00-060: IIS 4: Fix for Cross-Site Scripting Issues PRODUCT :Internet Information Server PROD/VER::4.0 OPER/SYS: KEYWORDS:kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Server version 4.0 ------------------------------------------------------------------------------- On November 2, 2000, Microsoft released an updated patch to correct a new variant of this vulnerability. Please see the Resolution section below for information on how to obtain the latest patch. For additional information about resolving this problem on IIS 5, click the article number below to view the article in the Microsoft Knowledge Base: Q275657 IIS 5: Fix for Cross-Site Scripting Issues SYMPTOMS ======== Microsoft has identified a vulnerability that could enable a malicious user to cause code to run on the computer of another user in the guise of a third-party web site. Such code could take any action on the user's computer that the third-party web site was permitted to take. In addition, the code could be made persistent, so that if the user returned to the web site again in the future, the code would begin running again. The vulnerability could only be exploited if the user clicked on a hypertext link, either in an HTML mail or on a malicious user's web site - the code could not be "injected" into an existing session. CAUSE ===== Certain Web services provided by Internet Information Server 4.0 do not properly validate all inputs before they use them, and are therefore vulnerable to Cross-Site Scripting (CSS). RESOLUTION ========== Windows NT 4.0 -------------- A supported fix is now available from Microsoft, but it is only intended to correct the problem described in this article and should be applied only to systems experiencing this specific problem. To resolve this problem, contact Microsoft Product Support Services to obtain the fix. 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 NOTE: In special cases, charges that are normally incurred for support calls may be canceled, if a Microsoft Support Professional determines that a specific update will resolve your problem. Normal support costs will apply to additional support questions and issues that do not qualify for the specific update in question. To resolve this problem, obtain the Windows NT 4.0 Security Rollup Package. For additional information, click the article number below to view the article in the Microsoft Knowledge Base: Q299444 Post-Windows NT 4.0 Service Pack 6a Security Rollup Package (SRP) The following file is available for download from the Microsoft Download Center: DownloadDownload Crsscri.exe now (http://www.microsoft.com/downloads/release.asp?ReleaseID=25534) 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. Date Time Version Size File name Platform -------------------------------------------------------------- 10/03/2000 09:03p 4.2.752.1 214,544 adsiis.dll x86 10/03/2000 09:03p 4.2.752.1 330,080 asp.dll x86 10/03/2000 08:13p 11,396 httpext.h x86 10/03/2000 09:02p 4.2.752.1 55,904 httpodbc.dll x86 10/03/2000 09:03p 4.2.752.1 98,912 iischema.dll x86 10/03/2000 08:13p 28,851 iiscnfg.h x86 10/03/2000 09:01p 4.2.752.1 185,792 infocomm.dll x86 10/03/2000 09:05p 4.2.752.1 54,560 ism.dll x86 10/03/2000 09:02p 4.2.752.1 38,256 ssinc.dll x86 10/03/2000 09:02p 4.2.752.1 25,360 sspifilt.dll x86 10/03/2000 09:02p 4.2.752.1 229,008 w3svc.dll x86 Microsoft Windows NT Server version 4.0, Terminal Server Edition ---------------------------------------------------------------- To resolve this problem, obtain the Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package (SRP). For additional information about the SRP, click the article number below to view the article in the Microsoft Knowledge Base: Q317636 Windows NT Server 4.0, Terminal Server Edition, Security Rollup Package STATUS ====== Microsoft has confirmed this to be a problem in Internet Information Server 4.0. 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 potentially enables 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 on how to check their code for potential vulnerabilities. Microsoft has identified several places in IIS where proper checking was not performed; some of these were found by our internal security teams, and others were identified by customers. For more specific information about CSS, see the FAQ on the following Web site: http://www.microsoft.com/technet/security/crsstFAQ.asp Additional query words: Patch Available for "IIS Cross-Site Scripting" Vulnerabilities security_patch ====================================================================== Keywords : kbSecurity kbWinNT400PreSP7Fix kbgraphxlinkcritical Technology : kbiisSearch kbiis400 Version : :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.