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AUSCERT External Security Bulletin Redistribution
ESB-2016.2679
MS16-142: Cumulative Security Update for Internet Explorer
(3198467) - Critical
9 November 2016
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AusCERT Security Bulletin Summary
---------------------------------
Product: Internet Explorer 9
Interent Explorer 10
Internet Explorer 11
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-2016-7195 CVE-2016-7196 CVE-2016-7198
CVE-2016-7199 CVE-2016-7227 CVE-2016-7239
CVE-2016-7241
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS16-142
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MS16-142: Cumulative Security Update for Internet Explorer (3198467) - Critical
Severity: Critical
Version: 1.0
Published Date: November 8, 2016
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.
Affected Software
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Vulnerability Information
Multiple Microsoft Browser Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that Microsoft
browsers access objects in memory. The vulnerabilities could corrupt memory in
a way that could allow an attacker to 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 Microsoft browsers, 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 via an enticement in
email or instant message, or by getting them to open an email attachment.
The update addresses the vulnerabilities by modifying how Microsoft browsers
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
Microsoft Browser Memory Corruption Vulnerability CVE-2016-7195 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-7196 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-7198 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-7241 No No
Microsoft Browser Information Disclosure Vulnerability CVE-2016-7199
An information disclosure vulnerability exists when Microsoft browsers
improperly handles objects in memory. An attacker who successfully exploited
this vulnerability could allow an attacker to obtain browser window state from
a different domain.
For an attack to be successful, an attacker must persuade a user to open a
malicious website from a secure website. The update addresses the vulnerability
by changing how Microsoft browsers 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
Microsoft Browser Information Disclosure Vulnerability CVE-2016-7199 Yes No
Microsoft Browser Information Disclosure Vulnerability CVE-2016-7227
An information disclosure vulnerability exists when (Internet Explorer/Edge/
Scripting Engine) does not properly handle objects in memory. The
vulnerability could allow an attacker to detect specific files on the user's
computer. In a web-based attack scenario, an attacker could host a website that
is used to attempt to exploit the vulnerability.
In addition, compromised websites and websites that accept or host user-generated
content could contain specially crafted content that could exploit the
vulnerability. In all cases, however, an attacker would have no way to force a
user 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 them to the attacker's site.
An attacker who successfully exploited the vulnerability could potentially read
data that was not intended to be disclosed. Note that the vulnerability would not
allow an attacker to execute code or to elevate a user's rights directly, but
the vulnerability could be used to obtain information in an attempt to further
compromise the affected system. The update addresses the vulnerability by helping
to restrict what information is returned to Internet Explorer.
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-2016-7227 No No
Microsoft Browser Information Disclosure Vulnerability CVE-2016-7239
An information disclosure vulnerability exists when the Microsoft browser XSS
filter is abused to leak sensitive page information. An attacker who
successfully exploited the vulnerability could obtain sensitive information
from certain web pages.
To exploit the vulnerability, an attacker would have to know what information
that the attacker is seeking, identify a page that is susceptible to the attack,
and then craft a special script to gather the information from the web pages.
The update addresses the vulnerability by changing how the XSS filter handles
RegEx.
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-2016-7239 No No
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===========================================================================
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The University of Queensland
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