Archive of CERT general posting, CERT Advisory CA-99.07 - IIS Buffer Overflow

17/06/99, CERT Advisory CA-99.07 - IIS Buffer Overflow
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Subject: CERT Advisory CA-99.07 - IIS Buffer Overflow
From: CERT Advisory <>
Date: Wed, 16 Jun 1999 16:33:44 -0400
Organization: CERT(sm) Coordination Center - +1 412-268-7090


CERT Advisory CA-99-07 IIS Buffer Overflow

   Originally released: June 16, 1999
   Source: CERT/CC
Systems Affected

     * Machines running Microsoft Internet Information Server 4.0.
I. Description

   A buffer overflow vulnerability affecting Microsoft Internet
   Information Server 4.0 has been discovered in the ISM.DLL library.
   According to Microsoft, ISM.DLL is the "filter DLL that processes .HTR
   files. HTR files enable remote administration of user passwords."
   A tool to exploit this vulnerability has been publicly released.
II. Impact

   This vulnerability allows 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 Microsoft Security Bulletin MS99-019 describing
   a workaround to this problem. Additionally, Microsoft is working on a
   patch to fix this problem; information regarding this patch will be
   available in the Microsoft Security Bulletin. 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.
   This document is available from:
CERT/CC Contact Information

          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

   We strongly urge you to encrypt sensitive information sent by email.
   Our public PGP key is available from
   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
   To be added to our mailing list for advisories and bulletins, send
   email to and include SUBSCRIBE
   your-email-address in the subject of your message.
   Copyright 1999 Carnegie Mellon University.
   Conditions for use, disclaimers, and sponsorship information can be
   found in
   * "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

Version: 2.6.2


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