Microsoft Security Bulletin MS16-002 - Critical

Cumulative Security Update for Microsoft Edge (3124904)

Published: January 12, 2016

Version: 1.0

This security update resolves vulnerabilities in Microsoft Edge. 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.

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

For more information about this update, see Microsoft Knowledge Base Article 3124904.

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 [1][2]
(3124266)

Microsoft Edge

Remote Code Execution

Critical

3116869 in MS15-125

Windows 10 for x64-based Systems [1][2]
(3124266)

Microsoft Edge

Remote Code Execution

Critical

3116869 in MS15-125

Windows 10 Version 1511 for 32-bit Systems [1][2]
(3124263)

Microsoft Edge

Remote Code Execution

Critical

3116900 in MS15-125

Windows 10 Version 1511 for x64-based Systems [1][2]
(3124263)

Microsoft Edge

Remote Code Execution

Critical

3116900 in MS15-125

[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.

[2]Customers running Windows 10 or Windows 10 Version 1511 who have Citrix XenDesktop installed will not be offered the update. Because of a Citrix issue with the XenDesktop software, users who install the update will be prevented from logging on. To stay protected, Microsoft recommends uninstalling the incompatible software and installing this update. Customers should contact Citrix for more information and help with this XenDesktop software issue.

The third-party products that this bulletin discusses are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, about the performance or reliability of these products.

Note Windows Server Technical Preview 3 and Windows Server Technical Preview 4 are affected. Customers running these operating systems are encouraged to apply the update, which is available via Windows 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.

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 January 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-2016-0003

Microsoft Edge Memory Corruption Vulnerability

Windows Clients
(Windows 10 Version 1511 is not affected)
Critical / RCE

Windows Servers:
Moderate / RCE

CVE-2016-0024

Scripting Engine Memory Corruption Vulnerability

Windows Clients
Critical / RCE

Windows Servers:
Moderate / RCE

Microsoft Edge Memory Corruption Vulnerability – CVE-2016-0003

A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory. The vulnerability 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 vulnerability 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 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 vulnerability 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 Edge Memory Corruption Vulnerability

CVE-2016-0003

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 Memory Corruption Vulnerability – CVE-2016-0024

A remote code execution vulnerability exists in the way that the Chakra JavaScript engine renders when handling objects in memory in Microsoft Edge. The vulnerability could corrupt memory in such a way that an attacker could 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 vulnerability 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 vulnerability.

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 vulnerability 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 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-2016-0024

No

No

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.


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

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

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.

  • V1.0 (January 12, 2016): Bulletin published.
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