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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.0760
        Cumulative Security Update for Internet Explorer (2722913)
                              15 August 2012

===========================================================================

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

Product:           Cumulative Security Update for Internet Explorer (2722913)
Publisher:         Microsoft
Operating System:  Windows XP
                   Windows Server 2003
                   Windows Vista
                   Windows Server 2008
                   Windows Server 2008 R2
                   Windows 7
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-2523 CVE-2012-2522 CVE-2012-2521
                   CVE-2012-1526  

Original Bulletin: 
   http://technet.microsoft.com/en-us/security/bulletin/MS12-052

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Microsoft Security Bulletin MS12-052 - Critical
Cumulative Security Update for Internet Explorer (2722913)

Published Date: August 14, 2012

Version: 1.0

General Information

Executive Summary 

This security update resolves four privately reported vulnerabilities in 
Internet Explorer. The most severe vulnerabilities could allow remote code 
execution if a user views a specially crafted webpage using Internet Explorer. 
An attacker who successfully exploited any of these vulnerabilities could gain
the same user rights as the current 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, Internet Explorer 8, and Internet Explorer 9 on Windows clients 
and Moderate for Internet Explorer 6, Internet Explorer 7, Internet Explorer 
8, and Internet Explorer 9 on Windows servers. For more information, see the 
subsection, Affected and Non-Affected Software, in this section.

Affected Software

Internet Explorer 6
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9
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 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems 
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems 
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems 
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems 
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1

Vulnerability Information

Layout Memory Corruption Vulnerability - CVE-2012-1526

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. 
The vulnerability may corrupt memory in such a way that an attacker could 
execute arbitrary code in the context of the current user.

Asynchronous NULL Object Access Remote Code Execution Vulnerability - 
CVE-2012-2521

A remote code execution vulnerability exists in the way that Internet Explorer 
accesses an object that has been deleted. The vulnerability may corrupt memory 
in such a way that an attacker could execute arbitrary code in the context of 
the current user.

Virtual Function Table Corruption Remote Code Execution Vulnerability - 
CVE-2012-2522

A remote code execution vulnerability exists in the way that Internet Explorer 
accesses a corrupted virtual function table that has been deleted. The 
vulnerability may corrupt memory in such a way that an attacker could execute 
arbitrary code in the context of the current user.


JavaScript Integer Overflow Remote Code Execution Vulnerability - CVE-2012-2523
A remote code execution vulnerability exists in the way that Internet Explorer 
calculates the size of an object in memory during a copy operation. The 
vulnerability may corrupt memory in such a way that an attacker could execute 
arbitrary code in the context of the current user.

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===========================================================================
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The University of Queensland
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