Microsoft Security Bulletin MS16-105 - Critical
Cumulative Security Update for Microsoft Edge (3183043)
Published: September 13, 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:
- modifying how Microsoft Edge and certain functions handle objects in memory.
- modifying how the Chakra JavaScript scripting engine handles objects in memory.
- correcting how Microsoft Edge handles cross-origin requests.
- ensuring that Microsoft Edge properly implements the Address Space Layout Randomization (ASLR) security feature.
- helping to ensure that Microsoft Edge properly validates page content.
For more information about the vulnerabilities, see the Vulnerability Information section.
For more information about this update, see Microsoft Knowledge Base Article 3183043.
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/3185611)[1] (3185611) | Microsoft Edge | Remote Code Execution | Critical | [3176492](https://support.microsoft.com/kb/3176492) |
[Windows 10 for x64-based Systems](https://support.microsoft.com/kb/3185611)[1] (3185611) | Microsoft Edge | Remote Code Execution | Critical | [3176492](https://support.microsoft.com/kb/3176492) |
[Windows 10 Version 1511 for 32-bit Systems](https://support.microsoft.com/kb/3185614)[1] (3185614) | Microsoft Edge | Remote Code Execution | Critical | [3176493](https://support.microsoft.com/kb/3176493) |
[Windows 10 Version 1511 for x64-based Systems](https://support.microsoft.com/kb/3185614)[1] (3185614) | Microsoft Edge | Remote Code Execution | Critical | [3176493](https://support.microsoft.com/kb/3176493) |
[Windows 10 Version 1607 for 32-bit Systems](https://support.microsoft.com/kb/3189866)[1] (3189866) | Microsoft Edge | Remote Code Execution | Critical | [3176495](https://support.microsoft.com/kb/3176495) |
[Windows 10 Version 1607 for x64-based Systems](https://support.microsoft.com/kb/3189866)[1] (3189866) | Microsoft Edge | Remote Code Execution | Critical | [3176495](https://support.microsoft.com/kb/3176495) |
Note The vulnerabilities discussed in this bulletin affect Windows Server 2016 Technical Preview 5. To be protected from the vulnerabilities, Microsoft recommends that customers running this operating system apply the current update, which is available exclusively from Windows Update.
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 September 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-2016-3247](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3247) | Microsoft Browser Memory Corruption Vulnerability | Windows Clients: **Important / RCE** Windows Servers: **Low / RCE** |
[CVE-2016-3291](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3291) | Microsoft Browser Information Disclosure Vulnerability | Windows Clients: **Moderate / ID** Windows Servers **Low / ID** |
[CVE-2016-3294](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3294) | Microsoft Edge Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** Windows Servers: **Moderate / RCE** |
[CVE-2016-3295](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3295) | Microsoft Browser Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** ** Windows Servers: **Moderate / RCE** |
[CVE-2016-3297](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3297) | Microsoft Browser Memory Corruption Vulnerability | Windows Clients: **Important / RCE** Windows Servers **Low / RCE** |
[CVE-2016-3325](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3325) | Microsoft Browser Information Disclosure Vulnerability | Windows Clients: **Important / ID** Windows Servers **Low / ID** |
[CVE-2016-3330](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3330) | Microsoft Edge Memory Corruption Vulnerability | Windows Clients: **Important / RCE** Windows Servers **Low / RCE** |
[CVE-2016-3350](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3350) | Scripting Engine Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** Windows Servers: **Moderate / RCE** |
[CVE-2016-3351](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3351) | Microsoft Browser Information Disclosure Vulnerability | Windows Clients: **Important / ID** Windows Servers **Low / ID** |
[CVE-2016-3370](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3370) | PDF Library Information Disclosure Vulnerability | Windows Clients: **Important / ID** Windows Servers **Low / ID** |
[CVE-2016-3374](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3374) | PDF Library Information Disclosure Vulnerability | Windows Clients: **Important / ID** Windows Servers **Low / ID** |
[CVE-2016-3377](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-3377) | Scripting Engine Memory Corruption Vulnerability | Windows Clients: **Critical / RCE** Windows Servers: **Moderate / RCE** |
Vulnerability Information
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 |
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 |
Vulnerability title | CVE number | Publicly disclosed | Exploited |
Microsoft Browser Information Disclosure Vulnerability | CVE-2016-3291 | No | No |
Vulnerability title | CVE number | Publicly disclosed | Exploited |
Microsoft Browser Information Disclosure Vulnerability | CVE-2016-3351 | No | Yes |
Vulnerability title | CVE number | Publicly disclosed | Exploited |
Microsoft Browser Information Disclosure Vulnerability | CVE-2016-3325 | No | No |
PDF Library Information Disclosure Vulnerability | CVE-2016-3370 | No | No |
PDF Library Information Disclosure Vulnerability | CVE-2016-3374 | No | No |