Multiple Microsoft Internet Explorer Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that Internet Explorer accesses 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 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 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 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-2016-3331

No

No

Microsoft Browser Memory Corruption Vulnerability

CVE-2016-3383

No

No

Internet Explorer Memory Corruption Vulnerability

CVE-2016-3384

No

No

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 Scripting Engine Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that the Scripting Engine renders when handling objects in memory in Microsoft browsers.

The vulnerabilities could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user.
In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerabilities through Internet Explorer or Edge 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 scripting 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 Scripting Engine handles objects in memory.
The following table contains links to the standard entry for each of the vulnerabilities in the Common Vulnerabilities and Exposures list:

Vulnerability title

CVE number

Publicly disclosed

Exploited

Scripting Engine Memory Corruption Vulnerability

CVE-2016-3382

No

No

Scripting Engine Memory Corruption Vulnerability

CVE-2016-3385

No

No

Scripting Engine Memory Corruption Vulnerability

CVE-2016-3390

No

No

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 Internet Explorer Elevation of Privilege Vulnerabilities
Multiple elevation of privilege vulnerabilities exist when Internet Explorer or Edge fails to properly secure private namespace.

An attacker who successfully exploited this vulnerability could gain elevated permissions on the namespace directory of a vulnerable system and gain elevated privileges.
The vulnerabilities by themselves do not allow arbitrary code to be run. However, these vulnerabilities could be used in conjunction with one or more other vulnerabilities (e.g. a remote code execution vulnerability and another elevation of privilege) that could take advantage of the elevated privileges when running.
The update addresses the vulnerabilities by correcting how Microsoft browsers handle namespace boundaries.
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 Elevation of Privilege Vulnerability

CVE-2016-3387

No

No

Microsoft Browser Elevation of Privilege Vulnerability

CVE-2016-3388

No

No

Mitigating Factors
Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.

Microsoft Browser Information Disclosure Vulnerability CVE-2016-3267
An information disclosure vulnerability exists when Internet Explorer or Edge 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 browsers.

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-2016-3267

No

No

Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

Microsoft Browser Information Disclosure Vulnerability CVE-2016-3391
An information disclosure vulnerability exists when Microsoft browsers leave credential data in memory.

An attacker who successfully exploited this vulnerability could harvest credentials from a memory dump of the browser process.

An attacker would need access to a dump of memory from the affected system.
The update addresses the vulnerability by changing the way Microsoft browsers store credentials 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-2016-3391

No

No

Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

Internet Explorer Information Disclosure Vulnerability CVE-2016-3298
An information disclosure vulnerability exists when Internet Explorer improperly handles objects in memory.

An attacker who successfully exploited this vulnerability could test for the presence of files on disk.

For an attack to be successful an attacker must persuade a user to open a malicious website.
The update addresses the vulnerability by changing the way 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 Information Disclosure Vulnerability

CVE-2016-3298

No

Yes

Mitigating Factors
Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

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