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 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

Windows Hyperlink Object Library Information Disclosure Vulnerability

CVE-2016-7278

No

No

Microsoft Browser Information Disclosure Vulnerability

CVE-2016-7282

Yes

No

Internet Explorer Information Disclosure Vulnerability

CVE-2016-7284

No

No

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
Remote code execution vulnerabilities exist when Microsoft Browsers 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 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 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 these 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 these 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-2016-7279

No

No

Internet Explorer Memory Corruption Vulnerability

CVE-2016-7283

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 Security Feature Bypass Vulnerability
A security feature bypass vulnerability exists when the Microsoft browsers fail to correctly apply Same Origin Policy for scripts running inside Web Workers.
An attacker could trick a user into loading a page with malicious content.

To exploit this vulnerability, an attacker would need to trick a user into loading a page or visiting a site.

The page could also be injected into a compromised site or ad network.
The update addresses the vulnerability by correcting the Same Origin Policy check for scripts running inside Web Workers.
The following table contains links to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title

CVE number

Publicly disclosed

Exploited

Microsoft Browser Security Feature Bypass Vulnerability

CVE-2016-7281

Yes

No

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

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

Multiple Scripting Engine Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way affected Microsoft scripting engines render 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.

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 who successfully exploited the 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 the vulnerabilities through a Microsoft browser 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 Edge 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 security update addresses the vulnerabilities by modifying how the affected Microsoft scripting engines 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

Scripting Engine Memory Corruption Vulnerability

CVE-2016-7202

Yes

No

Scripting Engine Memory Corruption Vulnerability

CVE-2016-7287

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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