[SECURITY-L] Microsoft Security Bulletin MS03-008: Flaw in Windows Script Engine Could Allow Code Execution (814078)

Silvana Mieko Misuta mieko em ccuec.unicamp.br
Qui Mar 20 09:05:07 -03 2003


    Subject: Microsoft Security Bulletin MS03-008: Flaw in Windows
Script Engine Could Allow Code
                 Execution (814078)
        Date: Wed, 19 Mar 2003 17:37:28 -0800
       From: "Microsoft"
<0_45730_AEE7C282-5BFD-4E84-98BC-79A14F27B03B_BR em Newsletters.Microsoft.com>

 Reply-To:
<3_45730_AEE7C282-5BFD-4E84-98BC-79A14F27B03B_BR em Newsletters.Microsoft.com>



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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
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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.


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