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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
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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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Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072
Internet Email: auscert@auscert.org.au
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