Multiple Microsoft Internet Explorer Memory Corruption Vulnerabilities
Multiple 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-2016-3288

No

No

Microsoft Browser Memory Corruption Vulnerability

CVE-2016-3289

No

No

Internet Explorer Memory Corruption Vulnerability

CVE-2016-3290

No

No

Microsoft Browser Memory Corruption Vulnerability

CVE-2016-3293

No

No

Microsoft Browser Memory Corruption Vulnerability

CVE-2016-3322

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 Information Disclosure Vulnerabilities
Multiple information disclosure vulnerabilities exist when Internet Explorer improperly handles page content, which could allow an attacker to detect the existence of specific files on the user’s system.

The update addresses the vulnerability by helping to ensure that page content is properly validated in Internet Explorer.
To exploit the vulnerabilities, in a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerabilities.
In addition, compromised websites and websites that accept or host user-provided content could contain 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.

For example, an attacker could trick users into clicking a link that takes them to the attacker’s site.

The update addresses the vulnerabilities by changing how certain functions 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

Internet Explorer Information Disclosure Vulnerability

CVE-2016-3321

No

No

Microsoft Browser Information Disclosure Vulnerability

CVE-2016-3329

No

No

Mitigating Factors
The following mitigating factors may be helpful in your situation:
For CVE-2016-3321 only: An attacker must have valid logon credentials and be able to log on locally to exploit this vulnerability.

Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.

Multiple Internet Explorer Information Disclosure Vulnerabilities
Multiple information disclosure vulnerabilities exist when Internet Explorer improperly handles objects in memory.

An attacker who successfully exploited the vulnerabilities could obtain information to further compromise the user’s system.
To exploit the vulnerabilities, in a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerabilities.
In addition, compromised websites and websites that accept or host user-provided content could contain 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.

For example, an attacker could trick users into clicking a link that takes them to the attacker’s site.

The update addresses the vulnerabilities by changing how certain functions 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 Information Disclosure Vulnerability

CVE-2016-3326

No

No

Microsoft Browser Information Disclosure Vulnerability

CVE-2016-3327

No

No

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

Workarounds
Microsoft has not identified any workarounds for these vulnerabilities.

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