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                             CERT-Renater

                  Note d'Information No. 2012/VULN480
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DATE                : 12/12/2012

HARDWARE PLATFORM(S): /

OPERATING SYSTEM(S) : Systems running Internet Explorer versions 6, 7,
                            8, 9, 10.

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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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