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             AUSCERT External Security Bulletin Redistribution

                               ESB-2011.0128
        Cumulative Security Update for Internet Explorer (2482017)
                              9 February 2011

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

Product:           Microsoft Internet Explorer 6
                   Microsoft Internet Explorer 7
                   Microsoft Internet Explorer 8
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows Server 2003
                   Windows Vista
                   Windows Server 2008
                   Windows 7
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-0038 CVE-2011-0036 CVE-2011-0035
                   CVE-2010-3971  

Reference:         ESB-2010.1176

Original Bulletin: 
   http://www.microsoft.com/technet/security/bulletin/MS11-003.mspx

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Microsoft Security Bulletin MS11-003 - Critical

Cumulative Security Update for Internet Explorer (2482017)

Version: 1.0

General Information

Executive Summary

This security update resolves two privately reported vulnerabilities and two 
publicly disclosed vulnerabilities in Internet Explorer. The vulnerabilities 
could allow remote code execution if a user views a specially crafted Web page 
using Internet Explorer or if a user opens a legitimate HTML file that loads a 
specially crafted library file. An attacker who successfully exploited any of 
these vulnerabilities could gain the same user rights as the local 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 Internet Explorer 6, Internet 
Explorer 7, and Internet Explorer 8 on Windows clients; and Moderate for 
Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8 on Windows 
servers. For more information, see the subsection, Affected and Non-Affected 
Software, in this section.

The security update addresses the vulnerabilities by modifying the way that 
Internet Explorer handles objects in memory, handles Cascading Style Sheets, 
and loads external libraries. For more information about the vulnerabilities, 
see the Frequently Asked Questions (FAQ) subsection for the specific 
vulnerability entry under the next section, Vulnerability Information.

This security update also addresses the vulnerability first described in 
Microsoft Security Advisory 2488013.

Affected Software

Internet Explorer 6
Internet Explorer 7**
Internet Explorer 8**
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 Service Pack 1 and Windows Vista Service Pack 2
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 for x64-based Systems and Windows Server 2008 for 
  x64-based Systems Service Pack 2
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 for Itanium-based Systems

**Server Core installation not affected. The vulnerabilities addressed by this 
update do not affect supported editions of Windows Server 2008 or Windows 
Server 2008 R2 as indicated, when installed using the Server Core installation 
option.

Vulnerability Information

CSS Memory Corruption Vulnerability - CVE-2010-3971

A remote code execution vulnerability exists in the way that Internet Explorer 
accesses memory while importing a Cascading Style Sheet that refers to itself 
recursively. 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-2011-0035

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-2011-0036

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.

Internet Explorer Insecure Library Loading Vulnerability - CVE-2011-0038

A remote code execution vulnerability exists in the way that Internet Explorer 
handles the loading of DLL files. 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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