MS16-076 - Important: Security Update for Netlogon (3167691) - Version: 1.0

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Microsoft Security Bulletin MS16-076 - Important

Security Update for Netlogon (3167691)

Published: June 14, 2016

Version: 1.0

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow remote code execution if an attacker with access to a domain controller (DC) on a target network runs a specially crafted application to establish a secure channel to the DC as a replica domain controller.

This security update is rated Important for all supported editions of Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2. For more information, see the Affected Software and Vulnerability Severity Ratings section.

The update addresses the vulnerability by modifying how Netlogon handles the establishment of secure channels. For more information about the vulnerability, see the Vulnerability Information section.

For more information about this update, see Microsoft Knowledge Base Article 3167691.

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.

The severity ratings indicated for each affected software 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 June bulletin summary.

[1]This update is available via Windows Update only.

*The Updates Replaced column shows only the latest update in a chain of superseded updates. For a comprehensive list of updates replaced, go to the Microsoft Update Catalog, search for the update KB number, and then view update details (updates replaced information is on the Package Details tab).

Why is security update 3161561 in this bulletin also denoted in MS16-075 
Security update 3161561 is also denoted in MS16-075 for supported releases of Windows Server 2008, Windows Server 2008 R2, and Windows Server 2012 due to the way fixes for vulnerabilities affecting particular products are consolidated. Because bulletins are broken out by the vulnerabilities being addressed, not by the update package being released, it is possible for separate bulletins, each addressing distinctly different vulnerabilities, to list the same update package as the vehicle for providing their respective fixes. This is frequently the case with cumulative updates for products, such as Internet Explorer or Silverlight, where singular security updates address different security vulnerabilities in separate bulletins.

Note Users do not need to install identical security updates that ship with multiple bulletins more than once.

Windows Netlogon Memory Corruption Remote Code Execution- CVE-2016-3228

This security update resolves a vulnerability in Microsoft Windows. The vulnerability could allow remote code execution when Windows improperly handles objects in memory. An attacker who successfully exploited this vulnerability could gain the same user rights as the current user. To exploit the vulnerability, a domain-authenticated attacker could make a specially crafted NetLogon request to a domain controller. Users 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 update corrects how Windows handles objects in memory to prevent corruption.

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
Windows Netlogon Memory Corruption Remote Code Execution Vulnerability	CVE-2016-3228	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 (June 14, 2016): Bulletin published.

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