Microsoft Security Bulletin MS16-119 - Critical

Cumulative Security Update for Microsoft Edge (3192890)

Published: October 11, 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.
  • restricting what information is returned to Microsoft Edge.
  • changing the way Microsoft Browsers store credentials in memory.
  • correcting how Microsoft Browsers handle namespace boundaries.
  • correcting how Microsoft Edge Content Security Policy validates documents.

For more information about the vulnerabilities, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3192890.

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[1] (3192440) Microsoft Edge Remote Code Execution Critical 3185611
Windows 10 for x64-based Systems[1] (3192440) Microsoft Edge Remote Code Execution Critical 3185611
Windows 10 Version 1511 for 32-bit Systems[1] (3192441) Microsoft Edge Remote Code Execution Critical 3185614
Windows 10 Version 1511 for x64-based Systems[1] (3192441) Microsoft Edge Remote Code Execution Critical 3185614
Windows 10 Version 1607 for 32-bit Systems[1] (3194798) Microsoft Edge Remote Code Execution Critical 3189866
Windows 10 Version 1607 for x64-based Systems[1] ( 3194798) Microsoft Edge Remote Code Execution Critical 3189866

[1]Windows 10 updates are cumulative. The monthly security release includes all security fixes for vulnerabilities that affect Windows 10, in addition to non-security updates. The updates are available via the Microsoft Update Catalog.

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 October 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-2016-3267 Microsoft Browser Information Disclosure Vulnerability Windows Clients:
Moderate / ID
Windows Servers:
Low / ID
CVE-2016-3331 Microsoft Browser Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
(Win 10 1607
is not affected)
CVE-2016-3382 Scripting Engine Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-3386 Scripting Engine Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-3387 Microsoft Browser Elevation of Privilege Vulnerability Windows Clients:
Important / EoP
Windows Servers:
Low / EoP
CVE-2016-3388 Microsoft Browser Elevation of Privilege Vulnerability Windows Clients:
Important / EoP
Windows Servers:
Low / EoP
CVE-2016-3389 Scripting Engine Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-3390 Scripting Engine Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-3391 Microsoft Browser Information Disclosure Vulnerability Windows Clients:
Moderate / ID
Windows Servers:
Low / ID
CVE-2016-3392 Microsoft Edge Security Feature Bypass Windows Clients:
Moderate / SFB
Windows Servers:
Low / SFB
CVE-2016-7189 Scripting Engine Remote Code Execution Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-7190 Scripting Engine Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE
CVE-2016-7194 Scripting Engine Memory Corruption Vulnerability Windows Clients:
Critical / RCE
Windows Servers:
Moderate / RCE

Vulnerability Information

Microsoft Edge Memory Corruption Vulnerability – CVE-2016-3331

A remote code execution vulnerability exists in the way that Microsoft Edge handles objects in memory. The vulnerability could corrupt memory in a way that could allow an attacker to execute arbitrary code in the context of the current user.

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. 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 vulnerability.

The security update addresses the vulnerability by modifying how Microsoft Edge handles objects in memory.

The following table contains a link 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-2016-3331 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-2016-3382 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-3386 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-3389 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-3390 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-7190 No No
Scripting Engine Memory Corruption Vulnerability CVE-2016-7194 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-2016-3267

An information disclosure vulnerability exists when Microsoft Edge does not properly handle objects in memory. The vulnerability could allow an attacker to detect specific files on the user's computer. In a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerability.

In addition, compromised websites and websites that accept or host user-generated content could contain specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force a user to view the 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.

An attacker who successfully exploited the vulnerability could potentially read data that was not intended to be disclosed. Note that the vulnerability would not allow an attacker to execute code or to elevate a user’s rights directly, but the vulnerability could be used to obtain information in an attempt to further compromise the affected system. The update addresses the vulnerability by helping to restrict what information is returned to Internet Explorer.

The following table contains a link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Browser Information Disclosure Vulnerability CVE-2016-3267 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-2016-3391

An information disclosure vulnerability exists when Microsoft browsers leave credential data in memory. An attacker who successfully exploited this vulnerability could harvest credentials from a memory dump of the browser process. An attacker would need access to a memory dump from the affected system.

The update addresses the vulnerability by changing the way Microsoft Browsers store credentials in memory.

The following table contains a link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Browser Information Disclosure Vulnerability CVE-2016-3391 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

Scripting Engine Remote Code Execution Vulnerability CVE-2016-7189

A remote code execution vulnerability exists when Microsoft Edge improperly handles objects in memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.

To exploit the vulnerability, in a web-based attack scenario, an attacker could host a website that is used to attempt to exploit the vulnerability. In addition, compromised websites and websites that accept or host user-provided content could contain specially crafted content that could exploit the vulnerability. In all cases, however, an attacker would have no way to force users to view the 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 vulnerability by correcting how the affected components handle objects in memory.

The following table contains a link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title CVE number Publicly disclosed Exploited
Scripting Engine Remote Code Execution Vulnerability CVE-2016-7189 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 Microsoft Browser Elevation of Privilege Vulnerabilities

Elevation of privilege vulnerabilities exist when Microsoft Edge fails to properly secure private namespace. An attacker who successfully exploited these vulnerabilities could gain elevated permissions on the namespace directory of a vulnerable system and gain elevated privileges.

The vulnerabilities by themselves do not allow arbitrary code to be run. However, these vulnerabilities could be used in conjunction with one or more vulnerabilities (e.g. a remote code execution vulnerability and another elevation of privilege) that could take advantage of the elevated privileges when running.

The update addresses the vulnerabilities by correcting how Microsoft Browsers handle namespace boundaries.

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 Elevation of Privilege Vulnerability CVE-2016-3388 No No
Microsoft Browser Elevation of Privilege Vulnerability CVE-2016-3387 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 Security Feature Bypass Vulnerability – CVE-2016-3392

A security feature bypass vulnerability exists when the Edge Content Security Policy fails to properly handle validation of certain specially crafted documents.

An attacker could trick a user into loading a page with malicious content. To exploit the vulnerability, an attacker would need to trick a user into loading a page or visiting a site. The page could also be injected into a compromised site or ad network.

The update corrects how Edge Content Security Policy validates documents.

The following table contains a link to the standard entry for the vulnerability in the Common Vulnerabilities and Exposures list:

Vulnerability title CVE number Publicly disclosed Exploited
Microsoft Edge Security Feature Bypass Vulnerability CVE-2016-3392 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for these vulnerabilities.

Workarounds

Microsoft has not identified any workarounds for these vulnerabilities.

Security Update Deployment

For Security Update Deployment information see the Microsoft Knowledge Base article referenced here in the Executive Summary.

Acknowledgments

Microsoft recognizes the efforts of those in the security community who help us protect customers through coordinated vulnerability disclosure. See Acknowledgments for more information.

Disclaimer

The information provided in the Microsoft Knowledge Base is provided "as is" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.

Revisions

  • V1.0 (October 11, 2016) Bulletin published.

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