Summary
This security update resolves a vulnerability in Microsoft .NET Framework that could allow remote code execution when .NET Framework processes untrusted input. An attacker who successfully exploits this vulnerability in software by using .NET Framework could take control of an affected system. The attacker could then install programs; view, change, or delete data; or create new accounts that have full user rights. Users whose accounts are configured to have fewer user rights on the system could be less affected than users who operate with administrative user rights.
To exploit the vulnerability, an attacker would first have to convince the user to open a malicious document or application.
This security update addresses the vulnerability by correcting how .NET Framework validates untrusted input.
To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2018-8421.
Important If you install a language pack after you install this update, you must reinstall this update. Therefore, we recommend that you install any language packs that you need before you install this update. For more information, see Add language packs to Windows.
Additional information about this security update
For more information about this security update as it relates to Windows Server 2012, see the following article in the Microsoft Knowledge Base:
4457915 Security Only updates for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows Server 2012 (KB 4457915)
Known issues
After the September 2018 .NET Framework security update is applied to resolve CVE-2018-8421 (.NET Framework remote code execution vulnerability), SharePoint out-of-the-box workflows stop working.
For more information about this known issue, see the following article in the Microsoft Knowledge Base:
4465015 SharePoint Workflows stop working after you install .NET security updates for CVE-2018-8421
How to obtain and install the update
Method 1: Microsoft Update Catalog
To get the stand-alone package for this update, go to the Microsoft Update Catalog.
Method 2: Windows Software Update Services (WSUS)
On your WSUS server, follow these steps:
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Select Start, select Administrative Tools, and then select Microsoft Windows Server Update Services 3.0.
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Expand ComputerName, and then select Action.
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Select Import Updates.
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WSUS opens a browser window in which you may be prompted to install an ActiveX control. Install the ActiveX control to continue.
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After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type 4457915 in the Search box, and then select Search.
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Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.
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After you select all the packages that you need, select View Basket.
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To import the packages to your WSUS server, select Import.
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After the packages are imported, select Close to return to WSUS.
The updates are now available for installation through WSUS.
Update deployment information
For deployment details for this security update, go to the following article in the Microsoft Knowledge Base:
20180911 Security update deployment information: September 11, 2018
Update removal information
Note We do not recommend that you remove any security update. To remove this update, use the Programs and Features item in Control Panel.
Update restart information
This update does not require a system restart after you apply it unless files that are being updated are locked or are being used.
Update replacement information
This update does not replace any previously released update.
File information
File hash
|
File name |
SHA1 hash |
SHA256 hash |
|---|---|---|
|
Windows8-RT-KB4457029-x64.msu |
1CFBDB1013D141558FB037C54EC8C68AD7A957C8 |
A62E5427D82073A88D7C44ED7D69AEF88E7487ADDE607781C978A049B90FE126 |
File attributes for all supported x64-based systems
The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and times for these files are listed in Coordinated Universal Time (UTC). The dates and times for these files on your local computer are displayed in your local time together with your current daylight saving time (DST) bias. Additionally, the dates and times may change when you perform certain operations on the files.
|
File name |
File version |
File size |
Date |
Time |
|---|---|---|---|---|
|
system.workflow.activities.dll |
4.0.30319.36465 |
1,071,272 |
09-Aug-2018 |
13:06 |
|
system.workflow.componentmodel.dll |
4.0.30319.36465 |
1,565,368 |
09-Aug-2018 |
13:06 |
|
system.workflow.runtime.dll |
4.0.30319.36465 |
506,520 |
09-Aug-2018 |
13:06 |
|
workflowservicehostperformancecounters.dll |
4.0.30319.36465 |
87,608 |
20-Aug-2018 |
18:51 |
|
system.workflow.activities.dll |
4.0.30319.36465 |
1,071,272 |
09-Aug-2018 |
13:06 |
|
system.workflow.componentmodel.dll |
4.0.30319.36465 |
1,565,368 |
09-Aug-2018 |
13:06 |
|
system.workflow.runtime.dll |
4.0.30319.36465 |
506,520 |
09-Aug-2018 |
13:06 |
|
workflowservicehostperformancecounters.dll |
4.0.30319.36465 |
75,512 |
20-Aug-2018 |
18:51 |
How to obtain help and support for this security update
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Help for installing updates: Windows Update FAQ
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Help for protecting your Windows-based products and services from viruses and malware: Microsoft Secure
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Local support according to your country: International Support
