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Related information

  Windows Script Engine integer overflow

  iDEFENSE Security Advisory 03.19.03: Heap Overflow in Windows Script Engine

From:MICROSOFT <secure_(at)_microsoft.com>
Date:20.03.2003
Subject:Microsoft Security Bulletin MS03-008: Flaw in Windows Script Engine Could Allow Code Execution (814078)

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Title:      Flaw in Windows Script Engine Could Allow Code
               Execution (814078)
Date:       19 March 2003
Software:   Microsoft Windows 98
             Microsoft Windows 98 Second Edition
             Microsoft Windows Me
             Microsoft Windows NT 4.0
             Microsoft Windows NT 4.0 Terminal Server Edition
             Microsoft Windows 2000
             Microsoft Windows XP
Impact:     Run Code of Attacker's Choice
Max Risk:   Critical
Bulletin:   MS03-008

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/MS03-008.asp
http://www.microsoft.com/security/security_bulletins/ms03-008.asp
- -------------------------------------------------------------------

Issue:
======
The Windows Script Engine provides Windows operating systems with
the ability to execute script code. Script code can be used to add
functionality to web pages, or to automate tasks within the
operating system or within a program. Script code can be written in
several different scripting languages, such as Visual Basic Script,
or JScript.

A flaw exists in the way by which the Windows Script Engine for
JScript processes information. An attacker could exploit the
vulnerability by constructing a web page that, when visited by the
user, would execute code of the attacker's choice with the user's
privileges. The web page could be hosted on a web site, or sent
directly to the user in email.

Although Microsoft has supplied a patch for this vulnerability and
recommends all affected customers install the patch immediately,
additional preventive measures have been provided that customers
can use to help block the exploitation of this vulnerability while
they are assessing the impact and compatibility of the patch. These
temporary workarounds are discussed in the "Workarounds" section in
the Frequently Asked Questions section of the security bulletin for
this release.


Mitigating Factors:
====================
- For an attack to be successful, the user would need to visit a
  website under the attacker's control or receive an HTML e-mail   
  from the attacker.
- Computers configured to disable active scripting in Internet
  Explorer are not susceptible to this issue.
- Exploiting the vulnerability would allow the attacker only the  
  same privileges as the user. Users whose accounts are configured
  to have few privileges on the system would be at less risk than
  ones who operate with administrative privileges.
- Automatic exploitation of the vulnerability by an HTML email
  would be blocked by Outlook Express 6.0 and Outlook 2002 in
  their default configurations, and by Outlook 98 and 2000 if used
  in conjunction with the Outlook Email Security Update.


Risk Rating:
============
- Critical

Patch Availability:
===================
- A patch is available to fix this vulnerability. Please read the
  Security Bulletins at

http://www.microsoft.com/technet/security/bulletin/ms03-008.asp
http://www.microsoft.com/security/security_bulletins/ms03-008.asp

  for information on obtaining this patch.


- -------------------------------------------------------------------

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE
WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE
FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

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