MS16-068 - Critical: Cumulative Security Update for Microsoft Edge (3163656) - Version: 1.0

Microsoft Edge Security Feature Bypass – CVE-2016-3198

A security feature bypass exists in Microsoft Edge when the Edge Content Security Policy (CSP) fails to properly validate certain specially crafted documents. An attacker who exploited the bypass could trick a user into loading a page containing malicious content.

To exploit the bypass, an attacker must trick a user into either loading a page containing malicious content or visiting a malicious website. The attacker could also inject the malicious page into either a compromised website or an advertisement network. The update addresses the bypass by correcting how the Edge CSP validates documents.

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 Edge Security Feature Bypass	CVE-2016-3198	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 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 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-2016-3199	No	No
Scripting Engine Memory Corruption Vulnerability	CVE-2016-3202	No	No
Scripting Engine Memory Corruption Vulnerability	CVE-2016-3214	No	No
Microsoft Edge Memory Corruption Vulnerability	CVE-2016-3222	Yes	No

Mitigating Factors

Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds

Microsoft has not identified any workarounds for these vulnerabilities.

Multiple Windows PDF Information Disclosure Vulnerabilities

Information disclosure vulnerabilities exist in Microsoft Windows when a user opens a specially crafted .pdf file. An attacker who successfully exploited the vulnerabilities could read information in the context of the current user.

To exploit the vulnerabilities, an attacker would have to trick the user into opening the .pdf file. The update addresses the vulnerabilities by modifying how Windows parses .pdf 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
Windows PDF Information Disclosure Vulnerability	CVE-2016-3201	No	No
Windows PDF Information Disclosure Vulnerability	CVE-2016-3215	No	No

Mitigating Factors

Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds

Microsoft has not identified any workarounds for these vulnerabilities.

Windows PDF Remote Code Execution Vulnerability - CVE-2016-3203

A remote code execution vulnerability exists in Microsoft Windows if a user opens a specially crafted .pdf file. An attacker who successfully exploited the vulnerability could cause arbitrary code to execute in the context of the current user.

To exploit the vulnerability, an attacker must entice the user to open a specially crafted .pdf file. The update addresses the vulnerabilities by modifying how Windows parses .pdf 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
Windows PDF Remote Code Execution Vulnerability	CVE-2016-3203	No	No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

from Microsoft Security Bulletins http://ift.tt/1Ps5nQ8