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             AUSCERT External Security Bulletin Redistribution

                               ESB-2009.1611
         Critical Cumulative Security Update for Internet Explorer
                              9 December 2009

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

Product:           Internet Explorer 5.01
                   Internet Explorer 5.01 Service Pack 4
                   Internet Explorer 6
                   Internet Explorer 6 Service Pack 1
                   Internet Explorer 7
                   Internet Explorer 8
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows 2000
                   Windows Server 2003
                   Windows Server 2008
                   Windows 7
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2009-3674 CVE-2009-3673 CVE-2009-3672
                   CVE-2009-3671 CVE-2009-2493 

Reference:         ESB-2009.1404
                   ESB-2009.1101

Original Bulletin: 
   http://www.microsoft.com/technet/security/Bulletin/MS09-072.mspx

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Microsoft Security Bulletin MS09-072

Critical Cumulative Security Update for Internet Explorer (976325)

  Published: December 08, 2009

  Version: 1.0

General Information 

Executive Summary

  This security update resolves four privately reported vulnerabilities and
  one publicly disclosed vulnerability in Internet Explorer. The
  vulnerabilities could allow remote code execution if a user views a
  specially crafted Web page using Internet Explorer. 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. An
  ActiveX control built with Microsoft Active Template Library (ATL) headers
  could also allow remote code execution; for more information about this
  issue, see the subsection, Frequently Asked Questions (FAQ) Related to
  This Security Update, in this section.

  This security update is rated Critical for all supported releases of
  Internet Explorer: Internet Explorer 5.01, Internet Explorer 6, Internet
  Explorer 6 Service Pack 1, Internet Explorer 7 (except when running on
  supported editions of Windows Server 2003 and Windows Server 2008), and
  Internet Explorer 8 (except when running on supported editions of Windows
  Server 2003, Windows Server 2008, and Windows Server 2008 R2). For Internet
  Explorer 7 and Internet Explorer 8 running on Windows servers as listed,
  this update is rated Moderate. For more information, see the subsection,
  Affected and Non-Affected Software, in this section.
 
  The security update addresses these vulnerabilities by correcting the
  control and by modifying the way that Internet Explorer handles objects in
  memory. For more information about the vulnerabilities, see the Frequently
  Asked Questions (FAQ) subsection under the next section, Vulnerability
  Information.

Affected Software

  Internet Explorer 5.01 
  Internet Explorer 5.01 Service Pack 4
  Internet Explorer 6 Service Pack 1
  Internet Explorer 6
  Internet Explorer 7
  Internet Explorer 8

Vulnerability Information

ATL COM Initialization Vulnerability - CVE-2009-2493

  A remote code execution vulnerability exists in an ActiveX control built
  with vulnerable Microsoft Active Template Library (ATL) headers. This
  vulnerability only directly affects systems with components and controls
  installed that were built using Visual Studio ATL. Components and controls
  built using ATL could allow the instantiation of arbitrary objects that can
  bypass related security policy, such as kill bits within Internet Explorer.
  Therefore, this vulnerability could allow a remote, unauthenticated user to
  perform remote code execution on an affected system. 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.

Uninitialized Memory Corruption Vulnerability - CVE-2009-3671

  A remote code execution vulnerability exists in the way that Internet
  Explorer accesses an object that has not been correctly initialized or has
  been deleted. 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.

HTML Object Memory Corruption Vulnerability - CVE-2009-3672

  A remote code execution vulnerability exists in the way that Internet Explorer
  accesses an object that has not been correctly initialized or has been 
  deleted. 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.

Uninitialized Memory Corruption Vulnerability - CVE-2009-3673

  A remote code execution vulnerability exists in the way that Internet
  Explorer accesses an object that has not been correctly initialized or has
  been deleted. 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.

Uninitialized Memory Corruption Vulnerability - CVE-2009-3674

  A remote code execution vulnerability exists in the way that Internet
  Explorer accesses an object that has not been correctly initialized or has
  been deleted. 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.

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===========================================================================
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The University of Queensland
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Qld 4072

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