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AUSCERT External Security Bulletin Redistribution
ESB-2012.1170
Cumulative Security Update for Internet Explorer (2761465)
11 December 2012
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AusCERT Security Bulletin Summary
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Product: Internet Explorer
Publisher: Microsoft
Operating System: Windows Server 2003
Windows Server 2008
Windows Server 2008 R2
Windows Vista
Windows XP
Windows 7
Windows 8
Windows RT
Windows Server 2012
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2012-4787 CVE-2012-4782 CVE-2012-4781
Original Bulletin:
http://technet.microsoft.com/en-us/security/bulletin/ms12-077
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Microsoft Security Bulletin MS12-077 - Critical
Cumulative Security Update for Internet Explorer (2761465)
Published Date: December 11, 2012
Version: 1.0
General Information
Executive Summary
This security update resolves three 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 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 and Internet
Explorer 10 on Windows clients and Moderate for Internet Explorer 9 and
Internet Explorer 10 on Windows servers. This security update has no severity
rating for Internet Explorer 6, Internet Explorer 7, and Internet Explorer 8.
Affected Software
Internet Explorer 6
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9
Internet Explorer 10
Vulnerability Information
InjectHTMLStream Use After Free Vulnerability - CVE-2012-4781
A remote code execution vulnerability exists in the way that Internet Explorer
accesses an object in memory 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.
CMarkup Use After Free Vulnerability - CVE-2012-4782
A remote code execution vulnerability exists in the way that Internet Explorer
accesses an object in memory 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.
Improper Ref Counting Use After Free Vulnerability - CVE-2012-4787
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
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