DOCUMENT:Q321123 15-AUG-2002 [iis] TITLE :MS02-018: Patch Available for Buffer Overrun in ASP Function 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 buffer overrun vulnerability exists in Internet Information Server 4.0 and Internet Information Services 5.0 and 5.1. By sending a specially chosen request to an affected Web server, an attacker might either disrupt Web services or gain the ability to run a program on the server. Such a program would run with full system permissions in Internet Information Server 4.0, and with fewer, but still significant, permissions in Internet Information Services 5.0 and 5.1. Customers who have used the IIS Lockdown Tool to configure their servers as static Web servers are already protected against this vulnerability. The URLScan tool, if it was deployed with the default rule set, would also make it hard to use the vulnerability to gain control of the server, and would likely reduce the vulnerability to only a denial-of-service attack. CAUSE ===== This vulnerability occurs because of a logic error in a function that handles server-side file includes for ASP pages. The result of the logic error is that the function might determine that it is safe to store the name of a specified server-side file in a particular buffer, when in actuality the file name is longer than the buffer. 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 about this vulnerability, visit the following Microsoft Web site: http://www.microsoft.com/technet/security/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.