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Home : Advisories : IIS Buffer Overflow

Title: IIS Buffer Overflow
Released by: CERT
Date: 18th June 1999
Printable version: Click here

Hash: SHA1

CERT Advisory CA-99-07 IIS Buffer Overflow

   Revised: June 18, 1999

   Originally released: June 16, 1999

   Source: CERT/CC


Systems Affected

     * Machines running Microsoft Internet Information Server 4.0


I. Description

   Buffer overflow vulnerabilities affecting Microsoft Internet

   Information Server 4.0 have been discovered in several libraries,

   including libraries that handle .HTR, .STM, and .IDC files.


   A tool to exploit at least one of the vulnerabilities has been

   publicly released.


II. Impact

   These vulnerabilities allow remote intruders to execute arbitrary code

   with the privileges of the IIS server. Additionally, intruders can use

   this vulnerability to crash vulnerable IIS processes.


III. Solution

   Microsoft has released and updated Microsoft Security Bulletin

   MS99-019, which points to a patch for these vulnerabilities. We

   encourage you to read this bulletin, available from




   We will update this advisory as more information becomes available.

   Please check the CERT/CC Web site for the most current revision.



   Our thanks to Jason Garms and Scott Culp of Microsoft for providing

   information contained in this advisory.



   This document is available from:




CERT/CC Contact Information

   Email: cert@cert.org

          Phone: +1 412-268-7090 (24-hour hotline)

          Fax: +1 412-268-6989

          Postal address:

          CERT Coordination Center

          Software Engineering Institute

          Carnegie Mellon University

          Pittsburgh PA 15213-3890



   CERT personnel answer the hotline 08:00-20:00 EST(GMT-5) / EDT(GMT-4)

   Monday through Friday; they are on call for emergencies during other

   hours, on U.S. holidays, and on weekends.


Using encryption

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   Our public PGP key is available from http://www.cert.org/CERT_PGP.key.

   If you prefer to use DES, please call the CERT hotline for more



Getting security information

   CERT publications and other security information are available from

   our web site http://www.cert.org/.


   To be added to our mailing list for advisories and bulletins, send

   email to cert-advisory-request@cert.org and include SUBSCRIBE

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   Copyright 1999 Carnegie Mellon University.

   Conditions for use, disclaimers, and sponsorship information can be

   found in http://www.cert.org/legal_stuff.html.


   * "CERT" and "CERT Coordination Center" are registered in the U.S.

   Patent and Trademark Office




   Any material furnished by Carnegie Mellon University and the Software

   Engineering Institute is furnished on an "as is" basis. Carnegie

   Mellon University makes no warranties of any kind, either expressed or

   implied as to any matter including, but not limited to, warranty of

   fitness for a particular purpose or merchantability, exclusivity or

   results obtained from use of the material. Carnegie Mellon University

   does not make any warranty of any kind with respect to freedom from

   patent, trademark, or copyright infringement.

   Revision History

June 16, 1999:  Initial release

June 18, 1999:  Added information about .STM and .IDC files.


Version: PGP for Personal Privacy 5.0

Charset: noconv





(C) 1999-2000 All rights reserved.