Microsoft Security Bulletin MS00-031
Patch Available for "Undelimited .HTR Request" and "File Fragment Reading via .HTR" Vulnerabilities
Originally Posted: May 10, 2000
Updated: July 17, 2000
Microsoft has released a patch that eliminates two security vulnerabilities in Microsoft® Internet Information Server. The vulnerabilities could, respectively, be used to slow an affected web server's response or to obtain the source code of certain types of files under very restricted conditions.
Frequently asked questions regarding this vulnerability and the patch can be found at http://www.microsoft.com/technet/security/bulletin/fq00-031.mspx
Please see the following references for more information related to this issue.
- Frequently Asked Questions: Microsoft Security Bulletin MS00-031, http://www.microsoft.com/technet/security/bulletin/fq00-031.mspx
- Microsoft Knowledge Base (KB) article 260838, A malformed request towards .HTR files denies other HTR requests and puts CPU at 100%, http://support.microsoft.com/default.aspx?scid=kb;en-us;260838
- Microsoft Knowledge Base (KB) article 260069, Malformed HTR Request Returns Source Code for ASP Scripting Files, http://support.microsoft.com/default.aspx?scid=kb;en-us;260069
- How to Change Windows NT Account Passwords Using Internet Information Server (IIS) 4.0, http://support.microsoft.com/default.aspx?scid=kb;en-us;184619
- Microsoft TechNet Security web site, http://www.microsoft.com/technet/security/default.mspx
Obtaining Support on this Issue
This is a fully supported patch. Information on contacting Microsoft Technical Support is available at http://support.microsoft.com/contactussupport/?ws=support.
- May 10, 2000: Bulletin Created.
- June 16, 2000: Release ID for IIS 5.0 version of patch updated.
- July 17, 2000: Release IDs updated to reflect availability of a fix for these issues via a subsequently released patch.
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.