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Message-ID: <20030716190651.606ED44C4@sitemail.everyone.net>
Date: Wed, 16 Jul 2003 12:06:51 -0700 (PDT)
From: Muhammad Faisal Rauf Danka <mfrd@...itudex.com>
To: bugtraq@...urityfocus.com
Subject: CERT Advisory CA-2003-14 Buffer Overflow in Microsoft Windows
HTML (fwd)
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Muhammad Faisal Rauf Danka
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Date: Mon, 14 Jul 2003 16:25:40 -0400
Message-Id: <CA-2003-14.1@...t.org>
From: CERT Advisory <cert-advisory@...t.org>
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Organization: CERT(R) Coordination Center - +1 412-268-7090
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Subject: CERT Advisory CA-2003-14 Buffer Overflow in Microsoft Windows HTML
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CERT Advisory CA-2003-14 Buffer Overflow in Microsoft Windows HTML
Conversion Library
Original issue date: July 14, 2003
Last revised: --
Source: CERT/CC
A complete revision history is at the end of this file.
Systems Affected
* Windows 98 and 98 Second Edition (SE)
* Windows NT 4.0 and 4.0 Terminal Server Edition (TSE)
* Windows Millennium Edition (Me)
* Windows 2000
* Windows XP
* Windows Server 2003
Overview
A buffer overflow vulnerability exists in a shared HTML conversion
library included in Microsoft Windows. An attacker could exploit this
vulnerability to execute arbitrary code or cause a denial of service.
I. Description
Microsoft Windows includes a shared HTML conversion library
(html32.cnv). According to Microsoft Security Bulletin MS03-023, "The
HTML converter is an extension which allows applications to convert
HTML data into Rich Text Format (RTF) while maintaining the formatting
and structure of the data as well as the text. The converter also
supports the conversion of RTF data into HTML."
The HTML conversion library contains a buffer overflow vulnerability
that can be triggered by a specially crafted align attribute in an
<HR> element. The library can be loaded by any application on the
system. For example, Internet Explorer (IE) uses the library to handle
HTML data stored in the clipboard. Using script, an attacker can cause
IE to copy a crafted <HR> element into the clipboard and load the
library. The attacker could accomplish this by convincing a victim to
view an HTML web page or HTML email message with IE, Outlook, or
Outlook Express in a zone where Active scripting and Allow paste
operations via script are enabled.
This vulnerability is not limited to IE, Outlook, or Outlook Express.
Any program, including non-Microsoft applications, can use the
vulnerable library and may present other vectors of attack.
Further information is available in VU#823260. Common Vulnerabilities
and Exposures (CVE) refers to this issue as CAN-2003-0469.
II. Impact
An attacker could execute arbitrary code with the privileges of the
process that loaded the HTML conversion library. The attacker could
also crash the process, causing a denial of service.
III. Solution
Apply a patch
Apply the appropriate patch as specified by Microsoft Security
Bulletin MS03-023.
Modify Internet Explorer security zone configuration
Modify one or both of the following IE security zone settings in the
Internet zone and the zone(s) used by Outlook, Outlook Express, and
any other application that uses Internet Explorer or the WebBrowser
ActiveX control to render HTML:
* Set Allow paste operations via script to Disable
* Set Active scripting to Disable
Either of these changes will prevent attacks that depend on scripting
in the IE HTML rendering engine. However, these changes are not
complete solutions, and they do not prevent attacks that use other
vectors.
Note that disabling Active scripting provides defense against other
attacks that are outside the scope of this document.
Instructions for modifying IE 5 security zone settings can be found in
the CERT/CC Malicious Web Scripts FAQ. In IE 6, the High security zone
setting includes both of these changes.
Appendix A. Vendor Information
This appendix contains information provided by vendors. When vendors
report new information, this section is updated and the changes are
noted in the revision history. If a vendor is not listed below, we
have not received their comments.
Microsoft
Please see Microsoft Security Bulletin MS03-023.
Appendix B. References
* CERT/CC Vulnerability Note VU#823260 -
<http://www.kb.cert.org/vuls/id/823260>
* Microsoft Security Bulletin MS03-023 -
<http://microsoft.com/technet/security/bulletin/MS03-023.asp>
_________________________________________________________________
This vulnerability was publicly reported by Digital Scream.
_________________________________________________________________
Feedback can be directed to the author, Art Manion.
______________________________________________________________________
This document is available from:
<http://www.cert.org/advisories/CA-2003-14.html>
______________________________________________________________________
CERT/CC Contact Information
Email: cert@...t.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
U.S.A.
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
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 subscribe to the CERT mailing list for advisories and bulletins,
send email to majordomo@...t.org. Please include in the body of your
message
subscribe cert-advisory
* "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.
_________________________________________________________________
Conditions for use, disclaimers, and sponsorship information
Copyright 2003 Carnegie Mellon University.
Revision History
July 14, 2003: Initial release
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