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AUSCERT External Security Bulletin Redistribution
ESB-2011.0812
Cumulative Security Update for Internet Explorer
10 August 2011
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AusCERT Security Bulletin Summary
---------------------------------
Product: Internet Explorer 6
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2011-2383 CVE-2011-1964 CVE-2011-1963
CVE-2011-1962 CVE-2011-1961 CVE-2011-1960
CVE-2011-1257
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS11-057.mspx
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Microsoft Security Bulletin MS11-057 - Critical
Cumulative Security Update for Internet Explorer (2559049)
Published: August 09, 2011
Version: 1.0
General Information
Executive Summary
This security update resolves five privately reported vulnerabilities
and two publicly disclosed vulnerabilities in Internet Explorer. The
most severe vulnerabilities could allow remote code execution if a user
views a specially crafted Web page using Internet Explorer. An attacker
who successfully exploited any of these vulnerabilities could gain the
same user rights as the local 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 on
Windows clients, and for Internet Explorer 7, Internet Explorer 8, and
Internet Explorer 9; and Important for Internet Explorer 6 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
Vulnerability Information
Window Open Race Condition Vulnerability - CVE-2011-1257
A remote code execution vulnerability exists in the way that Internet
Explorer accesses an object that may have been corrupted due to a race
condition. The vulnerability may corrupt memory in such a way that an
attacker could execute arbitrary code in the context of the logged-on
user.
Event Handlers Information Disclosure Vulnerability - CVE-2011-1960
An information disclosure vulnerability exists in Internet Explorer. An
attacker could exploit the vulnerability by constructing a specially
crafted Web page disguised as legitimate content. An attacker who
successfully exploited this vulnerability could view content from
another domain or Internet Explorer zone.
Telnet Handler Remote Code Execution Vulnerability - CVE-2011-1961
A remote code execution vulnerability exists in the way that Internet
Explorer uses the telnet URI handler. The handler may be used in such a
way that an attacker could execute arbitrary code in the context of the
logged-on user.
Shift JIS Character Encoding Vulnerability - CVE-2011-1962
An information disclosure vulnerability exists in Internet Explorer
that could allow script to gain access to information in another domain
or Internet Explorer zone. An attacker could exploit the vulnerability
by inserting specially crafted strings in to a Web site, resulting in
information disclosure when a user viewed the Web site. An attacker who
successfully exploited this vulnerability could view content from
another domain or Internet Explorer zone.
XSLT Memory Corruption Vulnerability - CVE-2011-1963
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
logged-on user.
Style Object Memory Corruption Vulnerability - CVE-2011-1964
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
logged-on user.
Drag and Drop Information Disclosure Vulnerability - CVE-2011-2383
An information disclosure vulnerability exists in Internet Explorer. An
attacker could exploit the vulnerability by constructing a specially
crafted Web page that could allow information disclosure if a user
viewed the Web page and performed a drag-and-drop operation. An
attacker who successfully exploited this vulnerability could gain
access to cookie files stored in the local machine.
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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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