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AUSCERT External Security Bulletin Redistribution
ESB-2011.0630
Cumulative Security Update for Internet Explorer (2530548)
15 June 2011
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AusCERT Security Bulletin Summary
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Product: Internet Explorer 6
Internet Explorer 7
Internet Explorer 8
Internet Explorer 9
Publisher: Microsoft
Operating System: Windows XP
Windows Server 2003
Windows Vista
Windows Server 2008
Windows 7
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Access Privileged Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2011-1262 CVE-2011-1261 CVE-2011-1260
CVE-2011-1258 CVE-2011-1256 CVE-2011-1255
CVE-2011-1254 CVE-2011-1252 CVE-2011-1251
CVE-2011-1250 CVE-2011-1246
Original Bulletin:
http://www.microsoft.com/technet/security/bulletin/MS11-050.mspx
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Microsoft Security Bulletin MS11-050 - Critical
Cumulative Security Update for Internet Explorer (2530548)
Version: 1.0
General Information
Executive Summary
This security update resolves eleven privately reported 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, Internet Explorer 7, Internet Explorer 8, and Internet Explorer 9;
and Moderate 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
Windows XP Service Pack 3
Windows XP Professional x64 Edition Service Pack 2
Windows Server 2003 Service Pack 2
Windows Server 2003 x64 Edition Service Pack 2
Windows Server 2003 with SP2 for Itanium-based Systems
Windows Vista Service Pack 1 and Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 1 and Windows Vista x64 Edition
Service Pack 2
Windows Server 2008 for 32-bit Systems and Windows Server 2008 for 32-bit
Systems Service Pack 2
Windows Server 2008 for x64-based Systems and Windows Server 2008 for
x64-based Systems Service Pack 2
Windows Server 2008 for Itanium-based Systems and Windows Server 2008 for
Itanium-based Systems Service Pack 2
Windows 7 for 32-bit Systems and Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems and Windows 7 for x64-based Systems Service
Pack 1
Windows Server 2008 R2 for x64-based Systems and Windows Server 2008 R2 for
x64-based Systems Service Pack 1
Windows Server 2008 R2 for Itanium-based Systems and Windows Server 2008 R2
for Itanium-based Systems Service Pack 1
Vulnerability Information
MIME Sniffing Information Disclosure Vulnerability - CVE-2011-1246
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.
Link Properties Handling Memory Corruption Vulnerability - CVE-2011-1250
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.
DOM Manipulation Memory Corruption Vulnerability - CVE-2011-1251
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.
toStaticHTML Information Disclosure Vulnerability - CVE-2011-1252
An information disclosure vulnerability exists in the way that Internet
Explorer handles content using specific strings when sanitizing HTML. 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.
An attacker who successfully exploited this vulnerability could inflict
cross-site scripting on the user, allowing the attacker to execute script in
the user's security context against a site that is using the toStaticHTML API.
Drag and Drop Memory Corruption Vulnerability - CVE-2011-1254
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.
Time Element Memory Corruption Vulnerability - CVE-2011-1255
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.
DOM Modification Memory Corruption Vulnerability - CVE-2011-1256
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-2011-1258
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 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 view content from another
domain or Internet Explorer zone.
Layout Memory Corruption Vulnerability - CVE-2011-1260
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.
Selection Object Memory Corruption Vulnerability - CVE-2011-1261
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.
HTTP Redirect Memory Corruption Vulnerability - CVE-2011-1262
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.
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The University of Queensland
Brisbane
Qld 4072
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