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AUSCERT External Security Bulletin Redistribution
ESB-2016.1712
Microsoft Security Bulletin MS16-084 - Critical
13 July 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Microsoft Internet Explorer
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Reduced Security -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2016-3276 CVE-2016-3274 CVE-2016-3273
CVE-2016-3264 CVE-2016-3260 CVE-2016-3259
CVE-2016-3248 CVE-2016-3245 CVE-2016-3243
CVE-2016-3242 CVE-2016-3241 CVE-2016-3240
CVE-2016-3204
Original Bulletin:
https://technet.microsoft.com/library/security/MS16-084
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Microsoft Security Bulletin MS16-084 - Critical
Cumulative Security Update for Internet Explorer (3169991)
Published: July 12, 2016
Version: 1.0
Executive Summary
This security update resolves vulnerabilities in Internet Explorer. The most
severe of the vulnerabilities could allow remote code execution if a user
views a specially crafted webpage using Internet Explorer. An attacker who
successfully exploited the vulnerabilities could gain the same user rights as
the current user. If the current user is logged on with administrative user
rights, an attacker could take control of an affected system. An attacker
could then install programs; view, change, or delete data; or create new
accounts with full user rights.
This security update is rated Critical for Internet Explorer 9 (IE 9), and
Internet Explorer 11 (IE 11) on affected Windows clients, and Moderate for
Internet Explorer 9 (IE 9), Internet Explorer 10 (IE 10), and Internet
Explorer 11 (IE 11) on affected Windows servers. For more information, see the
Affected Software section.
Affected Software
The following software versions or editions are affected.
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Windows Vista Service Pack 2
Windows Vista x64 Edition Service Pack 2
Windows Server 2008 for 32-bit Systems Service Pack 2
Windows Server 2008 for x64-based Systems Service Pack 2
Windows Server 2012
Windows 7 for 32-bit Systems Service Pack 1
Windows 7 for x64-based Systems Service Pack 1
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Windows 8.1 for 32-bit Systems
Windows 8.1 for x64-based Systems
Windows Server 2012 R2
Windows RT 8.1
Windows 10 for 32-bit Systems [3]
Windows 10 for x64-based Systems [3]
Windows 10 Version 1511 for 32-bit Systems [3]
Windows 10 Version 1511 for x64-based Systems [3]
[3]Windows 10 updates are cumulative. The monthly security release includes
all security fixes for vulnerabilities that affect Windows 10, in addition to
non-security updates. The updates are available via the Microsoft Update
Catalog.
Vulnerability Information
Multiple Microsoft Internet Explorer Memory Corruption Vulnerabilities
Remote code execution vulnerabilities exist when Internet Explorer improperly
accesses objects in memory. The vulnerabilities could corrupt memory in such a
way that an attacker could execute arbitrary code in the context of the
current user. An attacker who successfully exploited the vulnerabilities could
gain the same user rights as the current user. If the current user is logged
on with administrative user rights, the attacker could take control of an
affected system. An attacker could then install programs; view, change, or
delete data; or create new accounts with full user rights.
An attacker could host a specially crafted website that is designed to exploit
the vulnerabilities through Internet Explorer, and then convince a user to
view the website. The attacker could also take advantage of compromised
websites, or websites that accept or host user-provided content or
advertisements, by adding specially crafted content that could exploit the
vulnerabilities. In all cases, however, an attacker would have no way to force
users to view the attacker-controlled content. Instead, an attacker would have
to convince users to take action, typically by an enticement in an email or
Instant Messenger message, or by getting them to open an attachment sent
through email. The update addresses the vulnerabilities by modifying how
Internet Explorer handles objects in memory.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Internet Explorer Memory Corruption Vulnerability CVE-2016-3240 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-3241 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-3242 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-3243 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-3264 No No
Internet Explorer Security Feature Bypass Vulnerability - CVE-2016-3245
A restricted ports security feature bypass vulnerability exists for Internet
Explorer. An attacker could take advantage of the vulnerability to trick a
user into connecting to a remote system.
To exploit the vulnerability, an attacker would have to either convince a user
to visit a malicious website or inject malicious code into a compromised
website. The update addresses the vulnerability by correcting how Internet
Explorer validates URLs for restricted ports.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Internet Explorer Security Feature Bypass Vulnerability CVE-2016-3245 No No
Multiple Scripting Engine Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that the
JScript 9 and VBScript engines render when handling objects in memory in
Internet Explorer. The vulnerabilities could corrupt memory in such a way that
an attacker could execute arbitrary code in the context of the current user.
An attacker who successfully exploited the vulnerabilities could gain the same
user rights as the current user. If the current user is logged on with
administrative user rights, an attacker who successfully exploited the
vulnerabilities could take control of an affected system. An attacker could
then install programs; view, change, or delete data; or create new accounts
with full user rights.
In a web-based attack scenario, an attacker could host a specially crafted
website that is designed to exploit the vulnerabilities through Internet
Explorer and then convince a user to view the website. An attacker could also
embed an ActiveX control marked "safe for initialization" in an application or
Microsoft Office document that hosts the IE rendering engine. The attacker
could also take advantage of compromised websites, and websites that accept or
host user-provided content or advertisements. These websites could contain
specially crafted content that could exploit the vulnerabilities. The update
addresses the vulnerabilities by modifying how the JScript 9 and VBScript
scripting engines handle objects in memory.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Scripting Engine Memory Corruption Vulnerability CVE-2016-3204 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-3248 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-3259 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-3260 No No
Microsoft Browser Information Disclosure Vulnerability - CVE-2016-3273
An information disclosure vulnerability exists when the Microsoft Browser XSS
Filter does not properly validate content under specific conditions. An
attacker who exploited the vulnerability could run arbitrary JavaScript that
could lead to an information disclosure.
In a web-based attack scenario, an attacker could host a website in an attempt
to exploit this vulnerability. In addition, compromised websites and websites
that accept or host user-provided content could contain specially crafted
content that could exploit the vulnerability.
However, in all cases an attacker would have no way to force users to view the
attacker-controlled content. Instead, an attacker would have to convince users
to take action. For example, an attacker could trick users into clicking a
link that takes the user to the attacker's site. The update addresses the
vulnerability by correcting how the Microsoft Browser XSS Filter validates
content.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Browser Information Disclosure Vulnerability CVE-2016-3273 No No
Microsoft Browser Spoofing Vulnerability CVE-2016-3274
A spoofing vulnerability exists when a Microsoft browser does not properly
parse HTTP content. An attacker who successfully exploited this vulnerability
could trick a user by redirecting the user to a specially crafted website. The
specially crafted website could either spoof content or serve as a pivot to
chain an attack with other vulnerabilities in web services.
To exploit the vulnerability, the user must click a specially crafted URL. In
an email attack scenario, an attacker could send an email message containing
the specially crafted URL to the user in an attempt to convince the user to
click it.
In a web-based attack scenario, an attacker could host a specially crafted
website designed to appear as a legitimate website to the user. However, the
attacker would have no way to force the user to visit the specially crafted
website. The attacker would have to convince the user to visit the specially
crafted website, typically by way of enticement in an email or Instant
Messenger message, and then convince the user to interact with content on the
website. The update addresses the vulnerability by correcting how the
Microsoft browser parses HTTP responses.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Browser Spoofing Vulnerability CVE-2016-3274 No No
Microsoft Browser Spoofing Vulnerability CVE-2016-3276
A spoofing vulnerability exists when the Microsoft Browser in reader mode does
not properly parse HTML content. An attacker who successfully exploited this
vulnerability could trick a user by redirecting them to a specially crafted
website. The specially crafted website could spoof content or serve as a pivot
to chain an attack with other vulnerabilities in web services.
To exploit the vulnerability, the user must click a specially crafted URL. In
an email attack scenario, an attacker could send an email message containing
the specially crafted URL to the user in an attempt to convince the user to
click it.
In a web-based attack scenario, an attacker could host a specially crafted
website designed to appear as a legitimate website to the user. However, the
attacker would have no way to force the user to visit the specially crafted
website. The attacker would have to convince the user to visit the specially
crafted website, typically by way of enticement in an email or Instant
Messenger message, and then convince the user to interact with content on the
website. The update addresses the vulnerability by correcting how the
Microsoft Browser parses HTML.
The following table contains links to the standard entry for each
vulnerability in the Common Vulnerabilities and Exposures list:
Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Browser Spoofing Vulnerability CVE-2016-3276 No No
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