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ESB-2009.1405 - ALERT [Win] Microsoft Windows: Provide misleading information - Remote/unauthenticated

Date: 14 October 2009

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Click here for PGP verifiable version
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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1405
         Vulnerabilities in Windows CryptoAPI Could Allow Spoofing
                              14 October 2009

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           Microsoft Windows
Publisher:         Microsoft
Operating System:  Windows 2000
                   Windows XP
                   Windows Server 2003
                   Windows Vista
                   Windows Server 2008
                   Windows 7
Impact/Access:     Provide Misleading Information -- Remote/Unauthenticated
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-2511 CVE-2009-2510 

Original Bulletin: 
   http://www.microsoft.com/technet/security/bulletin/ms09-056.mspx

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Microsoft Security Bulletin MS09-056 - Important

Vulnerabilities in Windows CryptoAPI Could Allow Spoofing (974571)

Published: October 13, 2009

Version: 1.0

General Information

Executive Summary

  This security update resolves two publicly disclosed vulnerabilities in 
  Microsoft Windows. The vulnerabilities could allow spoofing if an attacker 
  gains access to the certificate used by the end user for authentication.

  This security update is rated Important for all supported editions of 
  Microsoft Windows 2000, Windows XP, Windows Server 2003, Windows Vista, 
  Windows Server 2008, and Windows 7. For more information, see the subsection, 
  Affected and Non-Affected Software, in this section.

  The security update addresses the vulnerabilities by modifying the CryptoAPI 
  to reject certificate names that contain null terminators, and to correctly 
  validate ASN.1 object identifiers. 

  Recommendation. The majority of customers have automatic updating enabled and
  will not need to take any action because this security update will be 
  downloaded and installed automatically. Customers who have not enabled 
  automatic updating need to check for updates and install this update 
  manually. For information about specific configuration options in automatic 
  updating, see Microsoft Knowledge Base Article 294871.

  For administrators and enterprise installations, or end users who want to 
  install this security update manually, Microsoft recommends that customers 
  apply the update at the earliest opportunity using update management 
  software, or by checking for updates using the Microsoft Update service.

  Known Issues. None

Affected Software

  Microsoft Windows 2000 Service Pack 4 

  Windows XP Service Pack 2 and Windows XP Service Pack 3

  Windows XP Professional x64 Edition Service Pack 2

  Windows Server 2003 Service Pack 2

  Windows Server 2003 x64 Edition Service Pack 2

  Windows Server 2003 with SP2 for Itanium-based Systems

  Windows Vista, Windows Vista Service Pack 1, and Windows Vista Service Pack 2

  Windows Vista x64 Edition, Windows Vista x64 Edition Service Pack 1, and 
  Windows Vista x64 Edition Service Pack 2

  Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit 
  Systems Service Pack 2 (Windows Server 2008 Server Core installation
  affected)

  Windows Server 2008 for x64-based Systems and Windows Server 2008 for 
  x64-based Systems Service Pack 2 (Windows Server 2008 Server Core 
  installation affected)

  Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for 
  Itanium-based Systems Service Pack 2

  Windows 7 for 32-bit Systems

  Windows 7 for x64-based Systems

  Windows Server 2008 R2 for x64-based Systems (Windows Server 2008 R2 Server 
  Core installation affected)

  Windows Server 2008 R2 for Itanium-based Systems

Vulnerability Information

Null Truncation in X.509 Common Name Vulnerability - CVE-2009-2510

  A spoofing vulnerability exists in the Microsoft Windows CryptoAPI component 
  when parsing ASN.1 information from X.509 certificates. An attacker who 
  successfully exploited this vulnerability could impersonate another user or 
  system.

Integer Overflow in X.509 Object Identifiers Vulnerability - CVE-2009-2511

  A spoofing vulnerability exists in the Microsoft Windows CryptoAPI component 
  when parsing ASN.1 object identifiers from X.509 certificates. An attacker 
  who successfully exploited this vulnerability could impersonate another user 
  or system.

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You have received this e-mail bulletin as a result of your organisation's
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maintained within your organisation, so if you do not wish to continue
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you do not know who that is, please send an email to auscert@auscert.org.au
and we will forward your request to the appropriate person.

NOTE: Third Party Rights
This security bulletin is provided as a service to AusCERT's members.  As
AusCERT did not write the document quoted above, AusCERT has had no control
over its content. The decision to follow or act on information or advice
contained in this security bulletin is the responsibility of each user or
organisation, and should be considered in accordance with your organisation's
site policies and procedures. AusCERT takes no responsibility for consequences
which may arise from following or acting on information or advice contained in
this security bulletin.

NOTE: This is only the original release of the security bulletin.  It may
not be updated when updates to the original are made.  If downloading at
a later date, it is recommended that the bulletin is retrieved directly
from the author's website to ensure that the information is still current.

Contact information for the authors of the original document is included
in the Security Bulletin above.  If you have any questions or need further
information, please contact them directly.

Previous advisories and external security bulletins can be retrieved from:

        http://www.auscert.org.au/render.html?cid=1980

If you believe that your computer system has been compromised or attacked in 
any way, we encourage you to let us know by completing the secure National IT 
Incident Reporting Form at:

        http://www.auscert.org.au/render.html?it=3192

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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