Microsoft Security Bulletin MS16-037 - Critical

Cumulative Security Update for Internet Explorer (3148531)

Published: April 12, 2016 | Updated: April 11, 2017

Version: 2.0

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.

The security update addresses the vulnerabilities by:

  • Modifying how Internet Explorer handles objects in memory
  • Correcting how Internet Explorer validates input before loading DLL files
  • Helping to restrict what information is returned to Internet Explorer

For more information about the vulnerabilities, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3148531.

Affected Software

The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.

Operating System Component Maximum Security Impact Aggregate Severity Rating Updates Replaced*
Internet Explorer 9
Windows Vista Service Pack 2 Internet Explorer 9
(4014661)
Remote Code Execution Critical 3148198 in MS16-037
Windows Vista x64 Edition Service Pack 2 Internet Explorer 9
(4014661)
Remote Code Execution Critical 3148198 in MS16-037
Windows Server 2008 for 32-bit Systems Service Pack 2 Internet Explorer 9
(4014661)
Remote Code Execution Moderate 3148198 in MS16-037
Windows Server 2008 for x64-based Systems Service Pack 2 Internet Explorer 9
(4014661)
Remote Code Execution Moderate 3148198 in MS16-037
Internet Explorer 10
Windows Server 2012
Security Only
Internet Explorer 10[1]
(4014661)
Remote Code Execution Moderate 3148198 in MS16-037
Windows Server 2012
Monthly Rollup
Internet Explorer 10
(4015551)
Remote Code Execution Moderate None
Internet Explorer 11
Windows 7 for 32-bit Systems Service Pack 1
Security Only
Internet Explorer 11 (4014661) Remote Code Execution Critical 3148198 in MS16-037
Windows 7 for 32-bit Systems Service Pack 1
Monthly Rollup
Internet Explorer 11 (4015549) Remote Code Execution Critical None
Windows 7 for x64-based Systems Service Pack 1
Security Only
Internet Explorer 11 (4014661) Remote Code Execution Critical 3148198 in MS16-037
Windows 7 for x64-based Systems Service Pack 1
Monthly Rollup
Internet Explorer 11 (4015549) Remote Code Execution Critical None
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Security Only
Internet Explorer 11[1]
(4014661)
Remote Code Execution Moderate 3148198 in MS16-037
Windows Server 2008 R2 for x64-based Systems Service Pack 1
Monthly Rollup
Internet Explorer 11[1]
(4015549)
Remote Code Execution Moderate None
Windows 8.1 for 32-bit Systems
Security Only
Internet Explorer 11 (4014661) Remote Code Execution Critical 3148198 in MS16-037
Windows 8.1 for 32-bit Systems
Monthly Rollup
Internet Explorer 11 (4015550) Remote Code Execution Critical None
Windows 8.1 for x64-based Systems
Security Only
Internet Explorer 11 (4014661) Remote Code Execution Critical 3148198 in MS16-037
Windows 8.1 for x64-based Systems
Monthly Rollup
Internet Explorer 11 (4015550) Remote Code Execution Critical None
Windows Server 2012 R2
Security Only
Internet Explorer 11 (4014661) Remote Code Execution Moderate 3148198 in MS16-037
Windows Server 2012 R2
Monthly Rollup
Internet Explorer 11 (4015550) Remote Code Execution Moderate None
Windows RT 8.1
Security Only
Internet Explorer 11[1] [2] (4014661) Remote Code Execution Critical 3148198 in MS16-037
Windows RT 8.1
Monthly Rollup
Internet Explorer 11
(4015550)
Remote Code Execution Critical None
Windows 10 for 32-bit Systems[3] (4015221) Internet Explorer 11 Remote Code Execution Critical 3147461
Windows 10 for x64-based Systems[3] (4015221) Internet Explorer 11 Remote Code Execution Critical 3147461
Windows 10 Version 1511 for 32-bit Systems[3] (4015219) Internet Explorer 11 Remote Code Execution Critical 3147458
Windows 10 Version 1511 for x64-based Systems[3] (4015219) Internet Explorer 11 Remote Code Execution Critical 3147458

[1]For information about changes in support for Internet Explorer beginning January 12, 2016, see Microsoft Support Lifecycle.

[2]This update is available via Windows Update.

[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.

Note Windows Server 2016 Technical Preview 4 and Windows Server 2016 Technical Preview 5 are affected. Customers running these operating systems are encouraged to apply the update, which is available via Windows Update.

*The Updates Replaced column shows only the latest update in any chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is provided on the Package Details tab).

Update FAQ

Does this update contain any additional security-related changes to functionality?
In addition to the changes that are listed for the vulnerabilities described in this bulletin, this update includes defense-in-depth updates to help improve security-related features.

Severity Ratings and Vulnerability Identifiers

The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the March bulletin summary.

Where specified in the Severity Ratings and Impact table, Critical, Important, and Moderate values indicate severity ratings. For more information, see Security Bulletin Severity Rating System. Refer to the following key for the abbreviations used in the table to indicate maximum impact:

Abbreviation Maximum Impact
RCE Remote Code Execution
EoP Elevation of Privilege
ID Information Disclosure
SFB Security Feature Bypass

Vulnerability Severity Ratings and Impact
CVE number Vulnerability title Internet Explorer 9 Internet Explorer 10 Internet Explorer 11 Internet Explorer 11
on Windows 10
CVE-2016-0154 Microsoft Browser Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-0159 Internet Explorer Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Not applicable Not applicable Not applicable
CVE-2016-0160 DLL Loading Remote Code Execution Vulnerability Not applicable Not applicable Windows Clients:
Important / RCE
Windows Servers:
Low / RCE
Windows Clients:
Important / RCE
Windows Servers:
Low / RCE
CVE-2016-0162 Internet Explorer Information Disclosure Vulnerability Windows Clients:
Moderate / ID
**
Windows Servers:
**Low / ID
Windows Clients:
Moderate / ID
**
Windows Servers:
**Low / ID
Windows Clients:
Moderate / ID
**
Windows Servers:
**Low / ID
Windows Clients:
Moderate / ID
**
Windows Servers:
**Low / ID
CVE-2016-0164 Internet Explorer Memory Corruption Vulnerability Not applicable Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Not applicable
CVE-2016-0166 Internet Explorer Memory Corruption Vulnerability Not applicable Not applicable Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE

Vulnerability Information

Multiple Internet Explorer Memory Corruption Vulnerabilities

Multiple remote code execution vulnerabilities exist when Internet Explorer improperly accesses 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 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. The attacker could also take advantage of compromised websites, or websites that accept or host user-generated 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.

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. 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
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0154 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-0159 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-0164 No No
Internet Explorer Memory Corruption Vulnerability CVE-2016-0166 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds

Microsoft has not identified any workarounds for these vulnerabilities.

DLL Loading Remote Code Execution Vulnerability - CVE-2016-0160

A remote code execution vulnerability exists when Internet Explorer improperly validates input before loading dynamic link library (DLL) files. 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. 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.

To exploit the vulnerability, an attacker would first have to log on to the target system and then run a specially crafted application. The updates address the vulnerability by correcting how Internet Explorer validates input before loading DLL files.

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
DLL Loading Remote Code Execution Vulnerability CVE-2016-0160 Yes No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

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.

Internet Explorer Information Disclosure Vulnerability - CVE-2016-0162

An information disclosure vulnerability exists when Internet Explorer does not properly handle JavaScript. 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
Internet Explorer Information Disclosure Vulnerability CVE-2016-0162 No Yes

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.

Revisions

  • V1.0 (April 12, 2016): Bulletin published.
  • V2.0 (April 11, 2017): Bulletin revised to announce the release of a new Internet Explorer cumulative update (4014661) for CVE-2016-0162. The update adds to the original release to comprehensively address CVE-2016-0162. Microsoft recommends that customers running the affected software install the security update to be fully protected from the vulnerability described in this bulletin. See Microsoft Knowledge Base Article 4014661 for more information.

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