Security and Quality Rollup for .NET Framework 3.5 for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2 (KB 4040981)

Notice

This update is included in the Security and Quality Rollup that’s dated November 14, 2017. This update was previously released as part of the Preview of Quality Rollup on October 17, 2017, the Security and Quality Rollup on October 10, 2017, and the Security and Quality Rollup on September 12, 2017.View products that this article applies to.

Summary

This security update resolves a vulnerability in the Microsoft .NET Framework that could allow remote code execution when Microsoft .NET Framework processes untrusted input. An attacker who successfully exploits this vulnerability by using the .NET Framework could take control of an affected system. An 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 by using administrative user rights.To exploit the vulnerability, an attacker must first convince the user to open a malicious document or application.This security update addresses the vulnerability by correcting how the .NET Framework validates untrusted input. To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2017-8759.Important

• All updates for Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 require update KB 2919355 to be installed. We recommend that you install update KB 2919355 on your Windows RT 8.1-based, Windows 8.1-based, or Windows Server 2012 R2-based computer so that you receive updates in the future.
• 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.

Quality and reliability fixes

Area	Description of the improvements
CLR1

• Very rarely, an instance of ReaderWriterLock may hang in the process of releasing a lock. A new configuration variable is introduced to allow opting in to the fix. To fix the issue, set the _COMPlus_ReaderWriterLock_UseFixedIdGeneration _environment variable to1before you start the application. Networking|

• A fix that was included in the May Monthly Security and Quality Rollup is changed to improve the performance of network latency. This latency affects Active Directory lookups for the enhanced key usage (EKU) object identifiers (OIDs) function that is used in TLS (Transport Layer Security) and SSL (Secure Sockets Layer) certificates.
  WMI2|

• Code is changed to make the setting of the privileges event-driven so that it can support changes in the option values.
  1 Common Language Runtime (CLR) 2 Windows Management Infrastructure (WMI)

More information

The following article provide information about supported .NET Framework versions for this Windows version. This includes the month and year of release, update replacement information, and help and support information for the update.4049017 November 2017 Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 updates for Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 (KB 4049017)4042078 October 2017 Preview of Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2 and 4.7 updates for Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 (KB 4042078)4043767 October 2017 Security and Quality Rollup for .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 updates for Windows 8.1, Windows RT 8.1 and Windows Server 2012 R2 (KB 4043767)4041085 Security and Quality Rollup for the .NET Framework 3.5, 4.5.2, 4.6, 4.6.1, 4.6.2, and 4.7 for Windows 8.1, Windows RT 8.1, and Windows Server 2012 R2: September 12, 2017

How to obtain and install the update

Method 1: Windows Update

This update is available through Windows Update. If automatic updating is turned on, this update is downloaded and installed automatically. For more information about how to get security updates automatically, see Windows Update: FAQ.

Method 2: Microsoft Update Catalog

To get the stand-alone package for this update, go to the Microsoft Update Catalog.

Method 3: Windows Software Update Services (WSUS)

On your WSUS server, follow these steps:

1. Select Start, selectAdministrative Tools, and then selectMicrosoft Windows Server Update Services 3.0.
2. Expand ComputerName, and then selectAction.
3. Select Import Updates.
4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. Install the ActiveX control to continue.
5. After the control is installed, you see the Microsoft Update Catalog screen. Enter4049017in theSearchbox, and then selectSearch.
6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Select Add to add them to your basket.
7. After you select all the packages that you need, select View Basket.
8. Select Import to import the packages to your WSUS server.
9. To return to WSUS, select Close after the packages have been imported.
   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:20170912 Security update deployment information: September 12, 2017

Update removal information

Note We do not recommend that you remove any security update. To remove this update, use thePrograms 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 replaces updates 4035038 and 4032115.

File information

File hash

Package name	Package hash SHA 1	Package hash SHA 2
Windows8.1-KB4040981-x64.msu	ACC8F5A9AC418DAD332E87A117C21EF8C96B983C	02EE4EB888F6CE6ECBBC57C2C76850E8FDA65E7CE32B3DC3B47A3A09EF26FE40
Windows8.1-KB4040981-x86.msu	96DA978D6F44B2918905D02D6935D31819FB21D1	8505BA3B453BB2C7B82CEA3BF9294A0314BA308C60811D346A6D7A7C6B73AEA1

File attributes

The English (United States) version of this hotfix 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.For all x86-based systemsFile name	File version	File size	Date	Time
presentationframework.dll	3.0.6920.8773	5,283,840	30-Mar-2017	13:15
reachframework.dll	3.0.6920.8773	532,480	30-Mar-2017	13:15
system.management.dll	2.0.50727.8766	389,120	12-Jul-2017	13:11
system.runtime.remoting.dll	2.0.50727.8771	307,200	31-Aug-2017	13:17
system.security.dll	2.0.50727.8759	270,336	30-Mar-2017	13:14
system.web.regularexpressions.dll	2.0.50727.8762	98,304	22-Apr-2017	13:09
system.dll	2.0.50727.8770	3,203,072	31-Aug-2017	13:17
windowsbase.dll	3.0.6920.8773	1,257,472	30-Mar-2017	13:15
big5.nlp		66,728	23-Sep-2015	13:34
bopomofo.nlp		82,172	23-Sep-2015	13:34
ksc.nlp		116,756	23-Sep-2015	13:34
mscorlib.dll	2.0.50727.8762	4,554,752	22-Apr-2017	13:09
normidna.nlp		59,342	23-Sep-2015	13:34
normnfc.nlp		45,794	23-Sep-2015	13:34
normnfd.nlp		39,284	23-Sep-2015	13:34
normnfkc.nlp		66,384	23-Sep-2015	13:34
normnfkd.nlp		60,294	23-Sep-2015	13:34
prc.nlp		83,748	23-Sep-2015	13:34
prcp.nlp		83,748	23-Sep-2015	13:34
sortkey.nlp		262,148	23-Sep-2015	13:34
sorttbls.nlp		20,320	23-Sep-2015	13:34
xjis.nlp		28,288	23-Sep-2015	13:34
aspnet_wp.exe	2.0.50727.8762	31,384	22-Apr-2017	13:09
mscordacwks.dll	2.0.50727.8762	990,368	22-Apr-2017	13:09
mscorwks.dll	2.0.50727.8762	5,946,520	22-Apr-2017	13:09
sos.dll	2.0.50727.8762	389,776	22-Apr-2017	13:09
webengine.dll	2.0.50727.8762	437,400	22-Apr-2017	13:09
wminet_utils.dll	2.0.50727.8766	116,896	12-Jul-2017	13:11
presentationcore.dll	3.0.6920.8773	4,222,976	30-Mar-2017	13:15
presentationfontcache.exe.config		161	20-Aug-2015	13:24
wpfgfx_v0300.dll	3.0.6920.8773	1,737,888	30-Mar-2017	13:15
system.data.dll	2.0.50727.8762	2,975,744	22-Apr-2017	13:09
system.printing.dll	3.0.6920.8773	372,736	30-Mar-2017	13:15
system.web.dll	2.0.50727.8762	5,287,936	22-Apr-2017	13:09
penimc.dll	3.0.6920.8773	68,752	30-Mar-2017	13:15
presentationframework.dll	3.0.6920.8773	5,283,840	30-Mar-2017	13:15
presentationhostdll.dll	3.0.6920.8773	131,248	30-Mar-2017	13:15
reachframework.dll	3.0.6920.8773	532,480	30-Mar-2017	13:15
windowsbase.dll	3.0.6920.8773	1,257,472	30-Mar-2017	13:15
For all x64-based systemsFile name	File version	File size	Date	Time
—	—	—	—	—
big5.nlp		66,728	22-Apr-2017	13:08
bopomofo.nlp		82,172	22-Apr-2017	13:08
ksc.nlp		116,756	22-Apr-2017	13:08
mscorlib.dll	2.0.50727.8762	4,571,136	22-Apr-2017	13:08
normidna.nlp		59,342	22-Apr-2017	13:08
normnfc.nlp		45,794	22-Apr-2017	13:08
normnfd.nlp		39,284	22-Apr-2017	13:08
normnfkc.nlp		66,384	22-Apr-2017	13:08
normnfkd.nlp		60,294	22-Apr-2017	13:08
prc.nlp		83,748	22-Apr-2017	13:08
prcp.nlp		83,748	22-Apr-2017	13:08
sortkey.nlp		262,148	22-Apr-2017	13:08
sorttbls.nlp		20,320	22-Apr-2017	13:08
xjis.nlp		28,288	22-Apr-2017	13:08
aspnet_wp.exe	2.0.50727.8762	43,160	22-Apr-2017	13:08
mscordacwks.dll	2.0.50727.8762	1,757,344	22-Apr-2017	13:08
mscorwks.dll	2.0.50727.8762	10,007,704	22-Apr-2017	13:08
sos.dll	2.0.50727.8762	486,032	22-Apr-2017	13:08
system.management.dll	2.0.50727.8766	389,120	12-Jul-2017	13:08
system.runtime.remoting.dll	2.0.50727.8771	307,200	31-Aug-2017	13:15
system.security.dll	2.0.50727.8759	270,336	30-Mar-2017	13:15
system.web.regularexpressions.dll	2.0.50727.8762	98,304	22-Apr-2017	13:08
system.dll	2.0.50727.8770	3,203,072	31-Aug-2017	13:15
webengine.dll	2.0.50727.8762	746,648	22-Apr-2017	13:08
wminet_utils.dll	2.0.50727.8766	140,960	12-Jul-2017	13:08
presentationcore.dll	3.0.6920.8773	4,006,400	30-Mar-2017	13:15
presentationfontcache.exe.config		161	22-Aug-2015	13:27
wpfgfx_v0300.dll	3.0.6920.8773	2,256,032	30-Mar-2017	13:15
system.data.dll	2.0.50727.8762	3,150,336	22-Apr-2017	13:08
system.printing.dll	3.0.6920.8773	358,400	30-Mar-2017	13:15
system.web.dll	2.0.50727.8762	5,296,128	22-Apr-2017	13:08
penimc.dll	3.0.6920.8773	85,648	30-Mar-2017	13:15
presentationframework.dll	3.0.6920.8773	4,640,768	30-Mar-2017	13:15
presentationhostdll.dll	3.0.6920.8773	172,208	30-Mar-2017	13:15
reachframework.dll	3.0.6920.8773	532,480	30-Mar-2017	13:15
windowsbase.dll	3.0.6920.8773	1,118,208	30-Mar-2017	13:15
presentationframework.dll	3.0.6920.8773	5,283,840	30-Mar-2017	13:15
reachframework.dll	3.0.6920.8773	532,480	30-Mar-2017	13:15
system.management.dll	2.0.50727.8766	389,120	12-Jul-2017	13:11
system.runtime.remoting.dll	2.0.50727.8771	307,200	31-Aug-2017	13:17
system.security.dll	2.0.50727.8759	270,336	30-Mar-2017	13:14
system.web.regularexpressions.dll	2.0.50727.8762	98,304	22-Apr-2017	13:09
system.dll	2.0.50727.8770	3,203,072	31-Aug-2017	13:17
windowsbase.dll	3.0.6920.8773	1,257,472	30-Mar-2017	13:15
big5.nlp		66,728	23-Sep-2015	13:34
bopomofo.nlp		82,172	23-Sep-2015	13:34
ksc.nlp		116,756	23-Sep-2015	13:34
mscorlib.dll	2.0.50727.8762	4,554,752	22-Apr-2017	13:09
normidna.nlp		59,342	23-Sep-2015	13:34
normnfc.nlp		45,794	23-Sep-2015	13:34
normnfd.nlp		39,284	23-Sep-2015	13:34
normnfkc.nlp		66,384	23-Sep-2015	13:34
normnfkd.nlp		60,294	23-Sep-2015	13:34
prc.nlp		83,748	23-Sep-2015	13:34
prcp.nlp		83,748	23-Sep-2015	13:34
sortkey.nlp		262,148	23-Sep-2015	13:34
sorttbls.nlp		20,320	23-Sep-2015	13:34
xjis.nlp		28,288	23-Sep-2015	13:34
aspnet_wp.exe	2.0.50727.8762	31,384	22-Apr-2017	13:09
mscordacwks.dll	2.0.50727.8762	990,368	22-Apr-2017	13:09
mscorwks.dll	2.0.50727.8762	5,946,520	22-Apr-2017	13:09
sos.dll	2.0.50727.8762	389,776	22-Apr-2017	13:09
webengine.dll	2.0.50727.8762	437,400	22-Apr-2017	13:09
wminet_utils.dll	2.0.50727.8766	116,896	12-Jul-2017	13:11
presentationcore.dll	3.0.6920.8773	4,222,976	30-Mar-2017	13:15
presentationfontcache.exe.config		161	20-Aug-2015	13:24
wpfgfx_v0300.dll	3.0.6920.8773	1,737,888	30-Mar-2017	13:15
system.data.dll	2.0.50727.8762	2,975,744	22-Apr-2017	13:09
system.printing.dll	3.0.6920.8773	372,736	30-Mar-2017	13:15
system.web.dll	2.0.50727.8762	5,287,936	22-Apr-2017	13:09
penimc.dll	3.0.6920.8773	68,752	30-Mar-2017	13:15
presentationframework.dll	3.0.6920.8773	5,283,840	30-Mar-2017	13:15
presentationhostdll.dll	3.0.6920.8773	131,248	30-Mar-2017	13:15
reachframework.dll	3.0.6920.8773	532,480	30-Mar-2017	13:15
windowsbase.dll	3.0.6920.8773	1,257,472	30-Mar-2017	13:15

How to obtain help and support for this security update

• Help for installing updates: Windows Update FAQ
• Security solutions for IT professionals: TechNet Security Support and Troubleshooting
• Help for protecting your Windows-based products and services from viruses and malware: Microsoft Secure
• Local support according to your country: International Support

Applies to

This article applies to the following:

• Microsoft .NET Framework 3.5 when used with:
  • Windows Server 2012 R2
  • Windows RT 8.1
  • Windows 8.1