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Posted Jun 3, 2002
Site cert.org

CERT Advisory CA-2002-14 - A remotely exploitable buffer overflow in Macromedia JRun v3.0 and 3.1 when running with IIS 4 or 5 allows remote attackers to execute code with SYSTEM privileges. According to Macromedia, JRun is deployed at over 10,000 organizations worldwide.

tags | remote, overflow
SHA-256 | cee2fc10d87afb680259c6f67e016f6345d10f40911ebac451a3ef50ee172dd7


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CERT Advisory CA-2002-14 Buffer overflow in Macromedia JRun

Original release date: May 29, 2002
Last revised: --
Source: CERT/CC

A complete revision history can be found at the end of this file.

Systems Affected

* Windows NT4 or Windows 2000 running IIS versions 4 or 5 and
Macromedia JRun 3.0 or 3.1


A remotely exploitable buffer overflow exists in Macromedia's JRun 3.0
and 3.1.

I. Description

JRun is an application server that works with most popular web
servers, such as Apache and Internet Information Server (IIS).
According to Macromedia, JRun is deployed at over 10,000 organizations

As reported in the Next Generation Security Software Advisory
(#NISR29052002), a remotely exploitable buffer overflow exists in the
ISAPI filter/application. Specifically, the buffer overflow exists in
the portion of code that handles the host header field. If an attacker
sends a specially crafted request to the application server, he can
overwrite a return address on the stack. Because the vulnerable DLL is
running in the address space of the web server process, code submitted
by the attacker will be run with SYSTEM privileges.

II. Impact

A remote attacker can execute arbitrary code on the vulnerable target
with SYSTEM privileges.

III. Solution

Apply a patch from Macromedia or upgrade to JRun 4. The patch is
available from:


JRun 4 is available at:


Appendix A. - Vendor Information

This appendix contains information provided by vendors for this
advisory. Additional information can be found in VU#703835.

Macromedia Inc.

Macromedia has confirmed that this is a problem in older versions
of JRun 3.0 and 3.1 and is soon to publish a security bulletin
regarding this. Visit the Macromedia security zone site at
http://www.macromedia.com/security for more information.

This vulnerability was discovered by David Litchfield of Next
Generation Security Software.

Author: Ian A. Finlay

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/CC personnel answer the hotline 08:00-17:00 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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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
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send email to majordomo@cert.org. Please include in the body of your

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* "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.

Conditions for use, disclaimers, and sponsorship information

Copyright 2002 Carnegie Mellon University.

Revision History

May 29, 2002: Initial release

Version: PGP 6.5.8

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