[SECURITY-L] CAIS-Alerta: Vulnerabilidade no ISAPI Extension do Windows Media Services (822343)

Qui Jun 26 16:47:24 -03 2003

----- Forwarded message from Centro de Atendimento a Incidentes de Seguranca <cais em cais.rnp.br> -----

From: Centro de Atendimento a Incidentes de Seguranca <cais em cais.rnp.br>
Subject: CAIS-Alerta: Vulnerabilidade no ISAPI Extension do Windows Media
 Services (822343)
To: rnp-alerta em cais.rnp.br, rnp-seg em cais.rnp.br
Date: Thu, 26 Jun 2003 13:35:11 -0300 (BRT)

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Prezados,

O CAIS está repassando o alerta divulgado pela Microsoft, Microsoft
Security Bulletin MS03-022: Flaw in ISAPI Extension for Windows Media
Services Could Cause Code Execution (822343), que trata de uma
vulnerabilidade identificada na extensao ISAPI, Internet Services
Application Programming Interface, relacionada com o Microsoft Windows
Media Services. Esta vulnerabilidade e' diferente da reportada no alerta
MS03-019 (817772) de 29 de Maio de 2003.

Sistemas Afetados:

        . Microsoft Windows 2000

Correções disponíveis:

A correção consiste na aplicação dos patches recomendados pela Microsoft e
disponíveis em:

        . Microsoft Windows 2000:
http://microsoft.com/downloads/details.aspx?FamilyId=F772E131-BBC9-4B34-9E78-F71D9742FED8&displaylang=en

Maiores informações:

        http://www.microsoft.com/technet/security/bulletin/ms03-022.asp

Identificador do CVE: CAN-2003-0349, (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 ISAPI Extension for Windows Media Services Could
            Cause Code Execution (822343)
Date:       25 June 2003
Software:   Microsoft(r) Windows(r) 2000
Impact:     Allow an attacker to execute code of their choice
Max Risk:   Important
Bulletin:   MS03-022

Microsoft encourages customers to review the Security Bulletins at:
http://www.microsoft.com/technet/security/bulletin/MS03-022.asp
http://www.microsoft.com/security/security_bulletins/ms03-022.asp
- - ------------------------------------------------------------------

Issue:
======
Microsoft Windows Media Services is a feature of Microsoft Windows
2000 Server, Advanced Server, and Datacenter Server and is also
available in a downloadable version for Windows NT 4.0 Server.
Windows Media Services contains support for a method of delivering
media content to clients across a network known as multicast
streaming. In multicast streaming, the server has no connection to
or knowledge of the clients that may be receiving the stream of
media content coming from the server. To facilitate logging of
client information for the server, Windows 2000 includes a
capability specifically designed to enable logging for multicast
transmissions.

This logging capability is implemented as an Internet Services
Application Programming Interface (ISAPI) extension - nsiislog.dll.
When Windows Media Services are added through add/remove programs to
Windows 2000, nsiislog.dll is installed in the Internet Information
Services (IIS) Scripts directory on the server.  Once Windows Media
Services is installed, nsiislog.dll is automatically loaded and used
by IIS.

There is a flaw in the way nsiislog.dll processes incoming client
requests. A vulnerability exists because an attacker could send
specially formed HTTP request (communications) to the server that
could cause IIS to fail or execute code on the user's system.

Windows Media Services is not installed by default on Windows 2000.
An attacker attempting to exploit this vulnerability would have to
be aware which computers on the network had Windows Media Services
installed on it and send a specific request to that server.

Mitigating Factors:
====================
 - Windows Media Services 4.1 is not installed by default on Windows
2000.
 - Windows Media Services are not available for Windows 2000
Professional.

Risk Rating:
============
Important

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

http://www.microsoft.com/technet/security/bulletin/ms03-022.asp
http://www.microsoft.com/security/security_bulletins/ms03-022.asp

   for information on obtaining this patch.

Acknowledgment:
===============
 - Brett Moore (brett.moore em security-assessment.com)

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

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