Multiple Microsoft Edge Memory Corruption Vulnerabilities
Multiple remote code execution vulnerabilities exist in the way that Microsoft Edge handles 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 vulnerability 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 Microsoft 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 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 Microsoft Edge handles objects in memory.
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 Memory Corruption Vulnerability

CVE-2016-3247

No

No

Microsoft Edge Memory Corruption Vulnerability

CVE-2016-3294

No

No

Microsoft Browser Memory Corruption Vulnerability

CVE-2016-3295

No

No

Microsoft Browser Memory Corruption Vulnerability

CVE-2016-3297

No

No

Microsoft Edge Memory Corruption Vulnerability

CVE-2016-3330

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

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 Microsoft 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 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 Chakra JavaScript scripting engine 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

Scripting Engine Memory Corruption Vulnerability

CVE-2016-3350

No

No

Scripting Engine Memory Corruption Vulnerability

CVE-2016-3377

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-2016-3291
An information disclosure vulnerability exists in the way that Microsoft Edge handles cross-origin requests.

An attacker who successfully exploited this vulnerability could determine the origin of all of the web pages in the affected browser.
In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerability.

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 vulnerability by correcting how Microsoft Edge handles cross-origin resources.
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-2016-3291

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-2016-3325
An information disclosure vulnerability exists in the way that certain functions handle objects in memory.

An attacker who successfully exploited the vulnerabilities could obtain information to further compromise a target system.
In a web-based attack scenario an attacker could host a website that is used to 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 vulnerability by correcting 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-2016-3325

No

No

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

Workarounds
Microsoft has not identified any workarounds for this vulnerability.

Multiple Information Disclosure Vulnerabilities
Multiple information disclosure vulnerabilities exist in the way that the affected components handle objects in memory.

An attacker who successfully exploited the vulnerabilities could obtain information to further compromise a target system.
In a web-based attack scenario an attacker could host a website that is used to 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 update addresses the vulnerabilities by correcting how the affected components 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-2016-3351

No

Yes

PDF Library Information Disclosure Vulnerability

CVE-2016-3370

No

No

PDF Library Information Disclosure Vulnerability

CVE-2016-3374

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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