Microsoft Security Bulletin MS16-068 - Critical
Cumulative Security Update for Microsoft Edge (3163656)
Published: June 14, 2016
Version: 1.0
Executive Summary
This security update resolves vulnerabilities in Microsoft Edge. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Microsoft Edge. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. Customers whose accounts are configured to have fewer user rights on the system could be less impacted than users with administrative user rights.
This security update is rated Critical for Microsoft Edge on Windows 10. For more information, see the Affected Software section.
The update addresses the vulnerabilities by:
- Correcting how the Edge Content Security Policy (CSP) validates documents
- Modifying how the Chakra JavaScript scripting engine handles objects in memory
- Modifying how Windows parses .pdf files
For more information about the vulnerabilities, see the Vulnerability Information section.
For more information about this update, see Microsoft Knowledge Base Article 3163656.
Affected Software
The following software versions or editions are affected. Versions or editions that are not listed are either past their support life cycle or are not affected. To determine the support life cycle for your software version or edition, see Microsoft Support Lifecycle.
**Operating System** | **Component** | **Maximum Security Impact** | **Aggregate Severity Rating** | **Updates Replaced** |
**Microsoft Edge** | ||||
[Windows 10 for 32-bit Systems](https://support.microsoft.com/kb/3163017)[1] (3163017) | Microsoft Edge | Remote Code Execution | Critical | [3156387](https://support.microsoft.com/kb/3156387) |
[Windows 10 for x64-based Systems](https://support.microsoft.com/kb/3163017)[1] (3163017) | Microsoft Edge | Remote Code Execution | Critical | [3156387](https://support.microsoft.com/kb/3156387) |
[Windows 10 Version 1511 for 32-bit Systems](https://support.microsoft.com/kb/3163018)[1] (3163018) | Microsoft Edge | Remote Code Execution | Critical | [3156421](https://support.microsoft.com/kb/3156421) |
[Windows 10 Version 1511 for x64-based Systems](https://support.microsoft.com/kb/3163018)[1] (3163018) | Microsoft Edge | Remote Code Execution | Critical | [3156421](https://support.microsoft.com/kb/3156421) |
Note Windows Server 2016 Technical Preview 5 is affected. Customers running this operating system are encouraged to apply the update, which is available via Windows Update.
Update FAQ
For my particular system and Microsoft Edge configuration, which update addresses the vulnerabilities discussed in CVE-2016-3201, CVE-2016-3203, and CVE-2016-3215?
The vulnerabilities addressed by the updates for CVE-2016-3201, CVE-2016-3203, and CVE-2016-3215 released in this bulletin (MS16-068) are for systems running Microsoft Edge. These CVEs are also addressed for operating system components in MS16-080. MS16-068 and MS16-080 is addressed by this month’s cumulative Windows 10 update.
Does this update contain any additional security-related changes to functionality?
In addition to the changes that are listed for the vulnerabilities described in this bulletin, this update includes defense-in-depth updates to help improve security-related features.
Severity Ratings and Vulnerability Identifiers
The following severity ratings assume the potential maximum impact of the vulnerability. For information regarding the likelihood, within 30 days of this security bulletin's release, of the exploitability of the vulnerability in relation to its severity rating and security impact, please see the Exploitability Index in the June bulletin summary.
Where specified in the Severity Ratings and Impact table, Critical, Important, and Moderate values indicate severity ratings. For more information, see Security Bulletin Severity Rating System. Refer to the following key for the abbreviations used in the table to indicate maximum impact:
Abbreviation | Maximum Impact |
RCE | Remote Code Execution |
EoP | Elevation of Privilege |
ID | Information Disclosure |
SFB | Security Feature Bypass |
**Vulnerability Severity Ratings and Impact** | ||
**CVE number** | **Vulnerability Title** | **Microsoft Edge** |
[CVE-2016-3198](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3198) | Microsoft Edge Security Feature Bypass | Windows Clients: **Important / SFB** Windows Servers: **Low / SFB** |
[CVE-2016-3199](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3199) | Scripting Engine Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** Windows Servers: **Moderate / RCE** |
[CVE-2016-3201](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3201) | Windows PDF Information Disclosure Vulnerability | Windows Clients: **Important / ID** Windows Servers: **Low / ID** |
[CVE-2016-3202](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3202) | Scripting Engine Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** Windows Servers: **Moderate / RCE** |
[CVE-2016-3203](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3203) | Windows PDF Remote Code Execution Vulnerability | Windows Clients: **Critical / RCE** Windows Servers: **Moderate / RCE** |
[CVE-2016-3214](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3214) | Scripting Engine Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** (Only Windows 10 Version 1511 is affected) Windows Servers: **Moderate / RCE** |
[CVE-2016-3215](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3215) | Windows PDF Information Disclosure Vulnerability | Windows Clients: **Important / ID** (Only Windows 10 Version 1511 is affected) Windows Servers: **Low / ID** |
[CVE-2016-3222](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3222) | Microsoft Edge Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** (Only Windows 10 Version 1511 is affected) Windows Servers: **Moderate / RCE** |
Vulnerability Information
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 |
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 |
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 |
Vulnerability title | CVE number | Publicly disclosed | Exploited |
Windows PDF Remote Code Execution Vulnerability | CVE-2016-3203 | No | No |