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AUSCERT External Security Bulletin Redistribution
ESB-2017.0657
MS17-006 - Critical: Cumulative Security Update for Internet
Explorer (4013073)
15 March 2017
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Publisher: Microsoft
Operating System: Windows
Impact/Access: Execute Arbitrary Code/Commands -- Remote with User Interaction
Increased Privileges -- Remote with User Interaction
Denial of Service -- Remote with User Interaction
Provide Misleading Information -- Remote with User Interaction
Access Confidential Data -- Remote with User Interaction
Resolution: Patch/Upgrade
CVE Names: CVE-2017-0154 CVE-2017-0149 CVE-2017-0130
CVE-2017-0059 CVE-2017-0049 CVE-2017-0049
CVE-2017-0040 CVE-2017-0037 CVE-2017-0033
CVE-2017-0018 CVE-2017-0012 CVE-2017-0009
CVE-2017-0008
Original Bulletin:
https://technet.microsoft.com/en-us/library/security/MS17-006
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MS17-006: Cumulative Security Update for Internet Explorer (4013073) Critical
Bulletin Number: MS17-006
Bulletin Title: Cumulative Security Update for Internet Explorer
Severity: Critical
KB Article: 4013073
Version: 1.0
Published Date: 14/03/2017
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 these 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 this vulnerability 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.
For more information about the vulnerabilities, see the Vulnerability
Information section.
For more information about this update, see Microsoft Knowledge Base Article
4013073.
Affected Software
Internet Explorer 9
Internet Explorer 10
Internet Explorer 11
Update FAQ
In addition to installing this update are there any further steps I need to
carry out to be protected from any of the vulnerabilities discussed in this
bulletin?
Yes. For Vista and Windows Server 2008 operating systems installing the
4012204 cumulative update by itself does not fully protect against
CVE-2017-0008 you must also install security update 3218362 in MS17-006 to be
fully protected from the vulnerability.
Vulnerability Information
Multiple Information Disclosure Vulnerabilities
Information disclosure vulnerabilities exist in the way that the affected
components handle objects in memory. An attacker who successfully exploited
these vulnerabilities could obtain information to further compromise a target
system.
In a web-based attack scenario an attacker could host a website in an attempt
to exploit the vulnerabilities. Additionally, compromised websites and
websites that accept or host user-provided content could contain specially
crafted content that could be used to exploit the vulnerabilities. However, in
all cases an attacker would have no way to force users to view
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.
The security update addresses the vulnerabilities by correcting how the
affected components handle objects in memory.
Mitigating Factors
Microsoft has not identified any mitigating factors for these vulnerabilities.
Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.
Multiple Microsoft Browser Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist when affected Microsoft
browsers improperly access objects in memory. These 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 these
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
these vulnerabilities through affected 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
vulnerability. 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 these vulnerabilities by modifying how Microsoft browsers
handle objects in memory.
Mitigating Factors
Microsoft has not identified any mitigating factors for these vulnerabilities.
Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.
FAQ
I am running Internet Explorer on Windows Server 2008, Windows Server 2008 R2,
Windows Server 2012, or Windows Server 2012 R2. Does this mitigate these
vulnerabilities?
Yes. By default, Internet Explorer on Windows Server 2008, Windows Server 2008
R2, Windows Server 2012, and Windows Server 2012 R2 runs in a restricted mode
that is known as Enhanced Security Configuration. Enhanced Security
Configuration is a group of preconfigured settings in Internet Explorer that
can reduce the likelihood of a user or administrator downloading and running
specially crafted web content on a server. This is a mitigating factor for
websites that you have not added to the Internet Explorer Trusted sites zone.
Can EMET help mitigate attacks that attempt to exploit these vulnerabilities?
Yes. The Enhanced Mitigation Experience Toolkit (EMET) enables users to manage
security mitigation technologies that help make it more difficult for
attackers to exploit memory corruption vulnerabilities in a given piece of
software. EMET can help mitigate attacks that attempt to exploit these
vulnerabilities in Internet Explorer on systems where EMET is installed and
configured to work with Internet Explorer.
For more information about EMET, see the Enhanced Mitigation Experience
Toolkit.
Multiple Microsoft Browser Spoofing Vulnerabilities
Spoofing vulnerabilities exist when a Microsoft browser does not properly
parse HTTP responses. An attacker who successfully exploited these
vulnerabilities could trick a user by redirecting them to a specially crafted
website. The specially crafted website could spoof content or be used as a
pivot to chain an attack with other vulnerabilities in web services.
To exploit these vulnerabilities, 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 vulnerabilities by correcting how Microsoft browsers
parse HTTP responses.
Mitigating Factors
Microsoft has not identified any mitigating factors for these vulnerabilities.
Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.
Multiple Scripting Engine Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that the
JScript and VBScript engines render when handling objects in memory in
Internet Explorer. These 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 these 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 these
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 these 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 these vulnerabilities.
The update addresses these vulnerabilities by modifying how the JScript and
VBScript scripting engines handle objects in memory.
Mitigating Factors
Microsoft has not identified any mitigating factors for these vulnerabilities.
Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.
Scripting Engine Information Disclosure Vulnerability - CVE-2017-0049
An information disclosure vulnerability exists when the Jscript 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 users rights
directly, but the vulnerability could be used to obtain information in an
attempt to further compromise the affected system.
The security update addresses the vulnerability by helping to restrict what
information is returned to affected Microsoft browsers.
Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.
Workarounds
Microsoft has not identified any workarounds for this vulnerability.
Internet Explorer Elevation of Privilege Vulnerability - CVE-2017-0154
An elevation of privilege vulnerability exists when Internet Explorer does not
properly enforce cross-domain policies, which could allow an attacker to
access information from one domain and inject it into another domain. The
update addresses the vulnerability by helping to ensure that cross-domain
policies are properly enforced in Internet Explorer.
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-provided content could contain specially
crafted content that could exploit the vulnerability. 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. For
example, an attacker could trick users into clicking a link that takes them to
the attacker's site. An attacker who successfully exploited this vulnerability
could elevate privileges in affected versions of Internet Explorer.
The vulnerability by itself does not allow arbitrary code to be run. However,
the vulnerability could be used in conjunction with another vulnerability (for
example, a remote code execution vulnerability) that could take advantage of
the elevated privileges when running arbitrary code. For example, an attacker
could exploit another vulnerability to run arbitrary code through Internet
Explorer, but due to the context in which processes are launched by Internet
Explorer, the code might be restricted to run at a low integrity level (very
limited permissions). However, an attacker could, in turn, exploit this
vulnerability to cause the arbitrary code to run at a medium integrity level
(permissions of the current user).
Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.
Workarounds
Microsoft has not identified any workarounds for this vulnerability.
Security Update Deployment
For Security Update Deployment information see the Microsoft Knowledge Base
article referenced here in the Executive Summary.
Acknowledgments
Microsoft recognizes the efforts of those in the security community who help
us protect customers through coordinated vulnerability disclosure. See
Acknowledgments for more information.
Disclaimer
The information provided in the Microsoft Knowledge Base is provided "as is"
without warranty of any kind. Microsoft disclaims all warranties, either
express or implied, including the warranties of merchantability and fitness
for a particular purpose. In no event shall Microsoft Corporation or its
suppliers be liable for any damages whatsoever including direct, indirect,
incidental, consequential, loss of business profits or special damages, even
if Microsoft Corporation or its suppliers have been advised of the possibility
of such damages. Some states do not allow the exclusion or limitation of
liability for consequential or incidental damages so the foregoing limitation
may not apply.
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