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                                   CERT-Renater

                        Note d'Information No. 2009/VULN355
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DATE                      : 08/09/2009

HARDWARE PLATFORM(S)      : /

OPERATING SYSTEM(S)       : Windows 2000, Windows XP, Windows Server 2003
                             running DHTML Editing Component ActiveX Control.

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KB956844
http://www.microsoft.com/technet/security/Bulletin/MS09-046.mspx
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Microsoft Security Bulletin MS09-046 - Critical

Vulnerability in DHTML Editing Component ActiveX Control Could Allow
Remote Code Execution (956844)

  Published: September 08, 2009

  Version: 1.0

General Information

Executive Summary

  This security update resolves a privately reported vulnerability in the DHTML
  Editing Component ActiveX control. An attacker could exploit the vulnerability
  by constructing a specially crafted Web page. When a user views the Web page,
  the vulnerability could allow remote code execution. An attacker who
  successfully exploited this vulnerability could gain the same user rights as
  the logged-on user. Users whose accounts are configured to have fewer user
  rights on the system could be less impacted than users who operate with
  administrative user rights.

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

  This security update addresses the vulnerability by revising the way that the
  ActiveX control formats HTML markup. For more information about this vulnerability,
  see the Frequently Asked Questions (FAQ) subsection for the specific vulnerability
  entry under the next section, Vulnerability Information.

  Recommendation. The majority of customers have automatic updates 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 updates 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 immediately using update management software, or by checking for updates
  using the Microsoft Update service. See also the section, Detection and Deployment
  Tools and Guidance, later in this bulletin.

  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

Vulnerability Information

DHTML Editing Component ActiveX Control Vulnerability - CVE-2009-2519

  A remote code execution vulnerability exists in the DHTML Editing Component
  ActiveX Control. An attacker could exploit the vulnerability by constructing
  a specially crafted Web page. When a user views the Web page, the
  vulnerability could allow remote code execution. An attacker who successfully
  exploited this vulnerability could gain the same user rights as the logged-on
  user.

  If a user is logged on with administrative user rights, an attacker who
  successfully exploited this vulnerability could take complete control of an
  affected system. An attacker could then install programs; view, change, or
  delete data; or create new accounts with full user rights. Users whose accounts
  are configured to have fewer user rights on the system could be less impacted
  than users who operate with administrative user rights.


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