Microsoft Security Bulletin MS16-024 - Critical

Cumulative Security Update for Microsoft Edge (3142019)

Published: March 8, 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:

  • Modifying how Microsoft Edge handles objects in memory
  • Changing how Microsoft Edge handles the referrer policy

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

For more information about this update, see Microsoft Knowledge Base Article 3142019.

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] (3140745) Microsoft Edge Remote Code Execution Critical 3135174
Windows 10 for x64-based Systems[1] (3140745) Microsoft Edge Remote Code Execution Critical 3135174
Windows 10 Version 1511 for 32-bit Systems[1] (3140768) Microsoft Edge Remote Code Execution Critical 3140743
Windows 10 Version 1511 for x64-based Systems[1] (3140768) Microsoft Edge Remote Code Execution Critical 3140743

[1]Windows 10 updates are cumulative. In addition to containing non-security updates, they also contain all of the security fixes for all of the Windows 10-affected vulnerabilities shipping with the monthly security release. The updates are available via the Microsoft Update Catalog.

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.

Update FAQ

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 March 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-2016-0102 Microsoft Browser Memory Corruption Vulnerability Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0105 Microsoft Browser Memory Corruption Vulnerability Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0109 Microsoft Browser Memory Corruption Vulnerability Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0110 Microsoft Browser Memory Corruption Vulnerability Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0111 Microsoft Browser Memory Corruption Vulnerability Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0116 Microsoft Edge Memory Corruption Vulnerability Windows Clients
Critical / RCE
(Windows 10 is not affected)

Windows Servers:
Moderate / RCE

CVE-2016-0123 Microsoft Edge Memory Corruption Vulnerability Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0124 Microsoft Edge Memory Corruption Vulnerability Windows Clients
Critical / RCE
(Windows 10 Version 1511 is not affected)

Windows Servers:
Moderate / RCE

CVE-2016-0125 Microsoft Edge Information Disclosure Vulnerability Windows Clients
Moderate / ID

Windows Servers:
Low / ID

CVE-2016-0129 Microsoft Edge Memory Corruption Vulnerability Windows Clients
Critical / RCE
(Windows 10 is not affected)

Windows Servers:
Moderate / RCE

CVE-2016-0130 Microsoft Edge 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 when Microsoft Edge improperly accesses objects in memory. 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 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 by adding 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, typically by way of enticement in an email or Instant Messenger message, or by getting them to open an attachment sent through email.

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. The update addresses the vulnerability by modifying how Microsoft Edge 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
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0102 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0105 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0109 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0110 No No
Microsoft Browser Memory Corruption Vulnerability CVE-2016-0111 No No
Microsoft Edge Memory Corruption Vulnerability CVE-2016-0116 No No
Microsoft Edge Memory Corruption Vulnerability CVE-2016-0123 No No
Microsoft Edge Memory Corruption Vulnerability CVE-2016-0124 No No
Microsoft Edge Memory Corruption Vulnerability CVE-2016-0129 No No
Microsoft Edge Memory Corruption Vulnerability CVE-2016-0130 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 Edge Information Disclosure Vulnerability - CVE-2016-0125

An information disclosure vulnerability exists when Microsoft Edge improperly handles the referrer policy. An attacker who successfully exploited the vulnerability could gain information about the request context or browsing history of a user.

To exploit the vulnerability, an attacker must convince a user who is accessing a secure website to click a link that takes the user to a malicious website. The update addresses the vulnerability by changing how Microsoft Edge handles the referrer policy.

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 Information Disclosure Vulnerability CVE-2016-0125 No No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

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 (March 8, 2016): Bulletin published.

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