Microsoft Security Bulletin MS15-071 - Important

Vulnerability in Netlogon Could Allow Elevation of Privilege (3068457)

Published: July 14, 2015

Version: 1.0

Executive Summary

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

This security update is rated Important for all supported editions of Windows Server 2003, Windows Server 2003 R2, Windows Server 2008, Windows Server 2008 R2, Windows Server 2012, and Windows Server 2012 R2. For more information, see the AffectedSoftware section.

The update addresses the vulnerability by modifying how Netlogon handles establishing secure channels. For more information about the vulnerability, see the VulnerabilityInformation section.

For more information about this update, see Microsoft Knowledge Base Article 3068457.

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 Maximum Security Impact Aggregate Severity Rating Updates Replaced
Windows Server 2003
Windows Server 2003 Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2003 x64 Edition Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2003 with SP2 for Itanium-based Systems
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2003 R2 Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2003 R2 x64 Edition Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008 for x64-based Systems Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008 for Itanium-based Systems Service Pack 2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2012 R2
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2012 (Server Core installation)
(3068457)
Elevation of Privilege Important 3002657 in MS15-027
Windows Server 2012 R2 (Server Core installation)
(3068457)
Elevation of Privilege Important 3002657 in MS15-027

[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).

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 July bulletin summary.

Vulnerability Severity Rating and Maximum Security Impact by Affected Software
Affected Software Elevation of Privilege Vulnerability in Netlogon - CVE-2015-2374 Aggregate Severity Rating
Windows Server 2003
Windows Server 2003 Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2003 R2 Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2003 x64 Edition Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2003 R2 x64 Edition Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2003 with SP2 for Itanium-based Systems
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008
Windows Server 2008 for 32-bit Systems Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008 for x64-based Systems Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008 for Itanium-based Systems Service Pack 2
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008 R2
Windows Server 2008 R2 for x64-based Systems Service Pack 1
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008 R2 for Itanium-based Systems Service Pack 1
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2012 and Windows Server 2012 R2
Windows Server 2012
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2012 R2
(3068457)
Important
Elevation of Privilege
Important
Server Core installation option
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2012 (Server Core installation)
(3068457)
Important
Elevation of Privilege
Important
Windows Server 2012 R2 (Server Core installation)
(3068457)
Important
Elevation of Privilege
Important

Vulnerability Information

Elevation of Privilege Vulnerability in Netlogon - CVE-2015-2374

An elevation of privilege vulnerability exists in Netlogon that is caused when the service improperly establishes a secure communications channel to a primary domain controller (PDC). To successfully exploit this vulnerability, an attacker would first need to have access to a PDC on a target network. An attacker could then run a specially crafted application that could establish a secure channel to the PDC as a replica domain controller and may be able to disclose credentials. Servers configured as domain controllers are at risk from this vulnerability. The update addresses the vulnerability by modifying the way that Netlogon handles establishing secure channels.

Microsoft received information about this vulnerability through coordinated vulnerability disclosure. When this security bulletin was issued, Microsoft had not received any information to indicate that this vulnerability had been publicly used to attack customers.

Mitigating Factors

Microsoft has not identified any mitigating factors for this vulnerability.

Workarounds

Microsoft has not identified any workarounds for this vulnerability.

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 (July 14, 2015): Bulletin published.

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