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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
http://www.microsoft.com/security/bulletins/ms99-019.asp
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:
http://www.cert.org/advisories/CA-99-07-IIS-Buffer-Overflow.html.
______________________________________________________________________
CERT/CC Contact Information
Email: This email address is being protected from spambots. You need JavaScript enabled to view it.
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
U.S.A.
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 http://www.cert.org/CERT_PGP.key.
If you prefer to use DES, please call the CERT hotline for more
information.
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 This email address is being protected from spambots. You need JavaScript enabled to view it. 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 http://www.cert.org/legal_stuff.html.
* "CERT" and "CERT Coordination Center" are registered in the U.S.
Patent and Trademark Office
______________________________________________________________________
NO WARRANTY
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
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