DOCUMENT:Q320374 15-AUG-2002 [iis] TITLE :MS02-018: Patch Available for Cross-site Scripting Vulnerability PRODUCT :Internet Information Server PROD/VER::5.0 OPER/SYS: KEYWORDS:kbenv kbSecurity kbWin2000PreSP3Fix kbWinXPpreSP1fix kbWin2000sp3fix ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - Microsoft Internet Information Services version 5.1 - Microsoft Internet Information Services version 5.0 ------------------------------------------------------------------------------- SYMPTOMS ======== A cross-site scripting (CSS) vulnerability exists in Internet Information Services (IIS) 5.0 and 5.1. Through this vulnerability, it could be possible for an attacker to send a request to an affected server that would cause a Web page that contains script to be sent to another user. The script would execute within the user's browser as though it had come from the third-party site. This would let it run by using the security settings that are appropriate to the third-party Web site, and provide the attacker with access to any data that the site owns. This vulnerability could only be exploited if the user opened an HTML mail message or visited a malicious user's Web site. The code cannot be "injected" into an existing session. CAUSE ===== This vulnerability occurs because a customized message service in IIS does not properly validate all inputs before they are used. The customized message is what is returned when someone requests a Web page that does not exist on the server. Note that the default error message in IIS is unaffected by this vulnerability. RESOLUTION ========== - Internet Information Services 5.1 - Internet Information Services 5.0 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 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. MORE INFORMATION ================ For more information about this vulnerability, see the following Microsoft Web site: http://www.microsoft.com/technet/security/bulletin/MS02-018.asp Additional query words: security_patch kbIIS400500510April2002Rollup ====================================================================== Keywords : kbenv kbSecurity kbWin2000PreSP3Fix kbWinXPpreSP1fix kbWin2000sp3fix Technology : kbiisSearch kbiis500 kbiis510 Version : :5.0 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.