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             AUSCERT External Security Bulletin Redistribution

             Cumulative Security Update for Internet Explorer
                             14 December 2011


        AusCERT Security Bulletin Summary

Product:           Microsoft Internet Explorer
Publisher:         Microsoft
Operating System:  Windows 7
                   Windows Server 2003
                   Windows Server 2008
                   Windows Server 2008 R2
                   Windows Vista
                   Windows XP
Impact/Access:     Execute Arbitrary Code/Commands -- Existing Account            
                   Access Confidential Data        -- Remote with User Interaction
                   Increased Privileges            -- Existing Account            
Resolution:        Patch/Upgrade
CVE Names:         CVE-2011-3404 CVE-2011-2019 CVE-2011-1992

Original Bulletin: 

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Microsoft Security Bulletin MS11-099 - Important

Cumulative Security Update for Internet Explorer (2618444)

Published Date: December 13, 2011

Version: 1.0

General Information

Executive Summary 

This security update resolves three privately reported vulnerabilities in
Internet Explorer. The most severe vulnerability could allow remote code
execution if a user opens a legitimate HyperText Markup Language (HTML) file
that is located in the same directory as a specially crafted dynamic link
library (DLL) file.

This security update is rated Important for Internet Explorer 7, Internet
Explorer 8, and Internet Explorer 9 on Windows clients and for Internet
Explorer 9 for Windows Server 2008 R2. This security update is also rated
Moderate for Internet Explorer 6 on all supported editions of Windows XP. This
security update is also rated Low for Internet Explorer on Windows servers
(except Windows Server 2008 R2).

Affected Software

Internet Explorer 6
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9

Vulnerability Information

XSS Filter Information Disclosure Vulnerability - CVE-2011-1992

An information disclosure vulnerability exists in Internet Explorer. An
attacker could exploit the vulnerability by constructing a specially crafted
Web page that contains malicious JavaScript code. An attacker who successfully
exploited this vulnerability could view content from another domain or Internet
Explorer zone.

Internet Explorer Insecure Library Loading Vulnerability - CVE-2011-2019

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.

Content-Disposition Information Disclosure Vulnerability - CVE-2011-3404

An information disclosure vulnerability exists in Internet Explorer that could
allow an attacker to force the browser to perform unexpected actions when a
user downloads Web content, allowing an attacker to view content from a different
domain or Internet Explorer zone other than the domain or zone of the attacker's
Web page.

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