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             AUSCERT External Security Bulletin Redistribution

                               ESB-2012.1077
        Cumulative Security Update for Internet Explorer (2761451)
                             13 November 2012

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

Product:           Internet Explorer 9
Publisher:         Microsoft
Operating System:  Windows
Impact/Access:     Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution:        Patch/Upgrade
CVE Names:         CVE-2012-4775 CVE-2012-1539 CVE-2012-1538

Original Bulletin: 
   http://technet.microsoft.com/en-us/security/bulletin/ms12-071

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Microsoft Security Bulletin MS12-071 - Critical

Cumulative Security Update for Internet Explorer (2761451)

Published Date: November 13, 2012

Version: 1.0

General Information

Executive Summary 

This security update resolves three privately reported vulnerabilities in
Internet Explorer. The vulnerabilities could allow remote code execution if a
user views a specially crafted webpage using Internet Explorer. An attacker who
successfully exploited 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 9 on Windows
clients and Moderate for Internet Explorer 9 on Windows servers. 

Affected Software

Internet Explorer 9

Vulnerability Information

CFormElement Use After Free Vulnerability - CVE-2012-1538

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.

CTreePos Use After Free Vulnerability - CVE-2012-1539

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.

CTreeNode Use After Free Vulnerability - CVE-2012-4775

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.

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===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
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