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MicrosoftKB4516055

HistorySep 10, 2019 - 7:00 a.m.

September 10, 2019—KB4516055 (Monthly Rollup)

2019-09-1007:00:00

Microsoft

support.microsoft.com

162

8.8 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

REQUIRED

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

HIGH

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

7.4 High

AI Score

Confidence

Low

9.3 High

CVSS2

Access Vector

NETWORK

Access Complexity

MEDIUM

Authentication

NONE

Confidentiality Impact

COMPLETE

Integrity Impact

COMPLETE

Availability Impact

COMPLETE

AV:N/AC:M/Au:N/C:C/I:C/A:C

0.279 Low

EPSS

Percentile

96.8%

JSON

September 10, 2019—KB4516055 (Monthly Rollup)

Improvements and fixes

This security update includes improvements and fixes that were a part of update KB4512512 (released August 17, 2019) and addresses the following issues:

Provides protections against a new subclass of speculative execution side-channel vulnerabilities, known as Microarchitectural Data Sampling, for 32-Bit (x86) versions of Windows (CVE-2019-11091, CVE-2018-12126, CVE-2018-12127, CVE-2018-12130). Use the registry settings as described in the Windows Client article_. _(These registry settings are enabled by default for Windows Client OS editions.)
Security updates to the Microsoft Scripting Engine, Windows App Platform and Frameworks, Windows Kernel, Windows Input and Composition, Windows Media, Windows Authentication, Windows Datacenter Networking, Windows Storage and Filesystems, the Microsoft JET Database Engine, and Windows Server .
For more information about the resolved security vulnerabilities, please refer to the Security Update Guide.

Known issues in this update

Symptom	Workaround
Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.	Do one of the following:

Perform the operation from a process that has administrator privilege.
Perform the operation from a node that doesn’t have CSV ownership.
Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update

Before installing this updateMicrosoft strongly recommends you install the latest servicing stack update (SSU) for your operating system before installing the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. If you are using Windows Update, the latest SSU (KB4512939) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.Install this update****Release Channel	Available	Next Step
Windows Update and Microsoft Update	Yes	None. This update will be downloaded and installed automatically from Windows Update.
Microsoft Update Catalog	Yes	To get the standalone package for this update, go to the Microsoft Update Catalog website.
Windows Server Update Services (WSUS)	Yes	This update will automatically synchronize with WSUS if you configure Products and Classifications as follows:Product: Windows Server 2012, Windows Embedded 8 StandardClassification: Security Updates File informationFor a list of the files that are provided in this update, download the file information for update 4516055.