[SECURITY-L] Fwd: CAIS-Alerta: Vulnerabilidade critica no Windows Script Engine (814078)
Silvana Mieko Misuta
mieko em ccuec.unicamp.br
Qui Mar 20 11:05:48 -03 2003
Subject: CAIS-Alerta: Vulnerabilidade critica no Windows Script Engine
(814078)
Date: Thu, 20 Mar 2003 11:01:29 -0300 (BRT)
From: Centro de Atendimento a Incidentes de Seguranca
<cais em cais.rnp.br>
To: rnp-alerta em cais.rnp.br, rnp-seg em cais.rnp.br
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Prezados,
O CAIS está repassando o alerta divulgado pela Microsoft, Microsoft
Security Bulletin MS03-008: Flaw in Windows Script Engine Could Allow
Code
Execution (814078), que trata de uma vulnerabilidade existente na
implementacao do Windows Script Engine que pode permitir a um atacante
remoto a execucao de codigo arbitrario.
Sistemas Afetados:
. 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
Correções disponíveis:
A correção consiste na aplicação do patch recomendado pela Microsoft e
disponíveis nas URLs listadas abaixo.
* Windows 98 and Windows 98 SE:
http://www.microsoft.com/windows98/downloads/contents/WUCritical/q814078/default.asp
* Windows Me:
http://windowsupdate.microsoft.com
* Windows NT 4.0:
http://microsoft.com/downloads/details.aspx?FamilyId=C6504FD9-5E2C-45BF-9424-55D7C5D2221B&displaylang=en
* Windows NT 4.0, Terminal Server Edition:
http://microsoft.com/downloads/details.aspx?FamilyId=C6504FD9-5E2C-45BF-9424-55D7C5D2221B&displaylang=en
* Windows 2000:
http://microsoft.com/downloads/details.aspx?FamilyId=824B1BD4-B4D6-49D5-8C58-199BDC731B64&displaylang=en
* Windows XP Home Edition and Professional Edition:
http://microsoft.com/downloads/details.aspx?FamilyId=824B1BD4-B4D6-49D5-8C58-199BDC731B64&displaylang=en
Maiores informações:
http://www.microsoft.com/technet/security/bulletin/ms03-008.asp
Identificador do CVE: CAN-2003-0010 (http://cve.mitre.org)
O CAIS recomenda aos administradores de plataformas Microsoft que
mantenham seus sistemas e aplicativos sempre atualizados.
Atenciosamente,
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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.
- -------------------------------------------------------------------
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