[SECURITY-L] CAIS-Alerta: Vulnerabilidade no Microsoft Excel (MS08-014)

[CSIRT - UNICAMP]

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From: Centro de Atendimento a Incidentes de Seguranca <cais em cais.rnp.br>
Subject:  CAIS-Alerta: Vulnerabilidade no Microsoft Excel (MS08-014)
To: pop-seg em cais.rnp.br, rnp-alerta em cais.rnp.br, rnp-seg em cais.rnp.br
Date: Tue, 11 Mar 2008 17:35:50 -0300 (BRT)

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Prezados,

O CAIS esta' repassando o alerta da Microsoft, intitulado "MS08-014 - 
Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution 
(949029)", que trata de multiplas vulnerabilidades encontradas no 
Microsoft Excel.

Tres vulnerabilidades estao relacionadas a abertura e manipulacao de 
arquivos excel. Uma esta' relacionada a manipulacao de formulas e outra a 
formatacao condicional de valores. A penultima vulnerabilidade e' 
decorrente da leitura incorreta de campos de texto rico e a ultima da 
abertura de aquivos por macros.

Das sete vulnerabilidades, as relacionadas ao Excel 2000 sao consideradas 
criticas pela Microsoft, sendo as demais consideradas importantes. A 
exploracao das vulnerabilidades pode permitir a execucao remota de codigo 
no sistema afetado caso um ataque seja realizado com sucesso.


Sistemas afetados:

. Excel 2000 Service Pack 3 componente do Microsoft Office 2000 Service Pack 3
. Excel 2002 Service Pack 3 componente do Microsoft Office XP Service Pack 3
. Excel 2003 Service Pack 2 componente do Microsoft Office 2003 Service Pack 2
. Excel 2007 componente do 2007 Microsoft Office System
. Microsoft Office Excel Viewer 2003
. Microsoft Office Compatibility Pack para Word, Excel, e PowerPoint 2007 File Formats
. Microsoft Office 2004 for Mac
. Microsoft Office 2008 for Mac


Correcoes disponiveis:

Recomenda-se fazer a atualizacao para as versoes disponiveis em:

. Excel 2000 Service Pack 3 componente do Microsoft Office 2000 Service Pack 3
  http://www.microsoft.com/downloads/details.aspx?FamilyId=f7f90c30-1bfd-406b-a77f-612443e30185

. Excel 2002 Service Pack 3 componente do Microsoft Office XP Service Pack 3
  http://www.microsoft.com/downloads/details.aspx?FamilyId=907f96d5-d1e9-4471-b41c-3ac811e63038

. Excel 2003 Service Pack 2 componente do Microsoft Office 2003 Service Pack 2
  http://www.microsoft.com/downloads/details.aspx?FamilyId=296e5f2c-f594-41c8-a20a-3e4c40ae3948

. Excel 2007 componente do 2007 Microsoft Office System
  http://www.microsoft.com/downloads/details.aspx?FamilyId=e7634cb5-9531-4284-9554-4168fc488e0c

. Microsoft Office Excel Viewer 2003
  http://www.microsoft.com/downloads/details.aspx?FamilyId=280bb2ac-b21a-46b5-8751-5a50fbebf107

. Microsoft Office Compatibility Pack para Word, Excel, e PowerPoint 2007 File Formats
  http://www.microsoft.com/downloads/details.aspx?FamilyId=e9251d71-9098-4125-ae91-7d4c83ea58ad

. Microsoft Office 2004 for Mac
  http://www.microsoft.com/downloads/details.aspx?FamilyId=95DCEB37-B35F-46DB-B280-DB0F3B298AA9

. Microsoft Office 2008 for Mac
  http://www.microsoft.com/downloads/details.aspx?FamilyId=8FE8C32A-6D7A-482B-97C6-42562F089EE4


Mais informacoes:

. MS08-014 - Vulnerabilities in Microsoft Excel Could Allow Remote Code Execution (949029)
  http://www.microsoft.com/technet/security/bulletin/ms08-014.mspx

. March Black Tuesday Overview
  http://www.isc.sans.org/diary.html?storyid=4124

. Microsoft Brasil Security
  http://www.microsoft.com/brasil/security

. Technet Brasil - Central de Seguranca
  http://www.technetbrasil.com.br/seguranca

. Windows Live OneCare
  http://safety.live.com/site/pt-BR/default.htm


Identificador CVE (http://cve.mitre.org): CVE-2008-0111, CVE-2008-0112,
                                          CVE-2008-0114, CVE-2008-0115,
                                          CVE-2008-0116, CVE-2008-0117,
                                          CVE-2008-0081


O CAIS recomenda que os administradores mantenham seus sistemas e 
aplicativos sempre atualizados, de acordo com as ultimas versoes e 
correcoes oferecidas pelos fabricantes.


Os Alertas do CAIS tambem sao oferecidos no formato RSS/RDF:
http://www.rnp.br/cais/alertas/rss.xml


Atenciosamente,

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