Microsoft Security Bulletin MS16-011 - Critical
Cumulative Security Update for Microsoft Edge (3134225)
Published: February 9, 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 those who operate 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 vulnerability by:
- Correcting how Microsoft Edge parses HTTP responses
- Modifying how Microsoft Edge handles objects in memory
- Helping to ensure that affected versions of Microsoft Edge properly implement the ASLR security feature
For more information about the vulnerability, see the Vulnerability Information section.
For more information about this update, see Microsoft Knowledge Base Article 3134225.
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.
Affected Software
**Operating System** | **Component** | **Maximum Security Impact** | **Aggregate Severity Rating** | **Updates Replaced** |
**Microsoft Edge** | ||||
[Windows 10 for 32-bit Systems](https://support.microsoft.com/kb/3135174)[1] (3135174) | Microsoft Edge | Remote Code Execution | Critical | [3124266](https://support.microsoft.com/kb/3124266) |
[Windows 10 for x64-based Systems](https://support.microsoft.com/kb/3135174)[1] (3135174) | Microsoft Edge | Remote Code Execution | Critical | [3124266](https://support.microsoft.com/kb/3124266) |
[Windows 10 Version 1511 for 32-bit Systems](https://support.microsoft.com/kb/3135173)[1] (3135173) | Microsoft Edge | Remote Code Execution | Critical | [3124263](https://support.microsoft.com/kb/3124263) |
[Windows 10 Version 1511 for x64-based Systems](https://support.microsoft.com/kb/3135173)[1] (3135173) | Microsoft Edge | Remote Code Execution | Critical | [3124263](https://support.microsoft.com/kb/3124263) |
Note Windows Server Technical Preview 4 is affected. Customers running these operating systems are encouraged to apply the update, which is available via 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 February 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-2016-0060](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0060) | Microsoft Browser Memory Corruption Vulnerability |
Windows Clients
**Critical / RCE**
Windows Servers: |
[CVE-2016-0061](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0061) | Microsoft Browser Memory Corruption Vulnerability |
Windows Clients
**Critical / RCE**
Windows Servers: |
[CVE-2016-0062](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0062) | Microsoft Browser Memory Corruption Vulnerability |
Windows Clients
**Critical / RCE**
Windows Servers: |
[CVE-2016-0077](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0077) | Microsoft Browser Spoofing Vulnerability |
Windows Clients:
**Moderate / Spoofing**
Windows Servers: |
[CVE-2016-0080](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0080) | Microsoft Edge ASLR Bypass |
Windows Clients:
**Important / SFB**
Windows Servers: |
[CVE-2016-0084](http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=cve-2016-0084) | Microsoft Edge Memory Corruption Vulnerability | Windows Clients **Critical / RCE** Windows Servers: **Moderate / RCE** |
Vulnerability Information
Microsoft Browser Spoofing Vulnerability – CVE-2016-0077
A spoofing vulnerability exists when a Microsoft browser does not properly parse HTTP responses. An attacker who successfully exploited this vulnerability could trick a user by redirecting them to a specially crafted website. The specially crafted website could spoof content or be used as a pivot to chain an attack with other vulnerabilities in web services.
To exploit the vulnerability, the user must click a specially crafted URL. In an email attack scenario, an attacker could send an email message containing the specially crafted URL to the user in an attempt to convince the user to click it.
In a web-based attack scenario, an attacker could host a specially crafted website designed to appear as a legitimate website to the user. However, the attacker would have no way to force the user to visit the specially crafted website. The attacker would have to convince the user to visit the specially crafted website, typically by way of enticement in an email or Instant Messenger message, and then convince the user to interact with content on the website. The update addresses the vulnerability by correcting how Microsoft Edge parses HTTP responses.
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 Spoofing Vulnerability | CVE-2016-0077 | No | No |
Vulnerability title | CVE number | Publicly disclosed | Exploited |
Microsoft Edge ASLR Bypass | CVE-2016-0080 | No | No |
Vulnerability title | CVE number | Publicly disclosed | Exploited |
Microsoft Browser Memory Corruption Vulnerability | CVE-2016-0060 | No | No |
Microsoft Browser Memory Corruption Vulnerability | CVE-2016-0061 | No | No |
Microsoft Browser Memory Corruption Vulnerability | CVE-2016-0062 | No | No |
Microsoft Edge Memory Corruption Vulnerability | CVE-2016-0084 | No | No |