Description of the Security Only update for .NET Framework 3.5.1 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4344177)

Summary

This security update resolves an information disclosure vulnerability in Microsoft .NET Framework that could allow an attacker to access information in multi-tenant environments. The vulnerability is caused when .NET Framework is used in high-load/high-density network connections in which content from one stream can blend into another stream.To exploit the vulnerability, an attacker who can access one tenant in a high-load/high-density environment could potentially trigger multi-tenanted data exposure from one customer to another.This security update addresses the vulnerability by correcting the way that .NET Framework handles high-load/high-density network connections.To learn more about this vulnerability, see Microsoft Common Vulnerabilities and Exposures CVE-2018-8360.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 7 Service Pack 1 (SP1) and Windows Server 2008 R2 SP1, see the following article in the Microsoft Knowledge Base:4345679 Security Only updates for .NET Framework 3.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1 and Server 2008 R2 SP1 (KB 4345679)

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:

1. Click Start, clickAdministrative Tools, and then clickMicrosoft Windows Server Update Services 3.0.
2. Expand ComputerName, and then clickAction.
3. Click Import Updates.
4. WSUS opens a browser window in which you may be prompted to install an ActiveX control. You must install the ActiveX control to continue.
5. After the ActiveX control is installed, you see the Microsoft Update Catalog screen. Type4345679in theSearchbox, and then clickSearch.
6. Locate the .NET Framework packages that match the operating systems, languages, and processors in your environment. Click Add to add them to your basket.
7. After you select all the packages that you require, click View Basket.
8. To import the packages to your WSUS server, click Import.
9. After the packages are imported, click 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:20180814 Security update deployment information: August 14, 2018

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 update 3142024.

File information

File hash

File name	SHA1 hash	SHA256 hash
Windows6.1-KB4344177-ia64.msu	EB3C241C084EE84B5C247CE3651D4EDBD9054550	242D1EBE4AEA545127595BD2B962CE5A8A34A9E27B8C4E5C9F982261C44539ED
Windows6.1-KB4344177-x64.msu	AC4E288D33FEAD366BCBAD5135D1AA6BC4D787F2	582D062D637EDC2C98D93264E6C5BF3CED672A2ACB6B34405C7549B2642CFCF3
Windows6.1-KB4344177-x86.msu	46D7719CB93D9DE74F2399A864F66A3361079676	01FF814EB93C807977FF51A0929B3D976A52FB5D06D6A16374F215C0DC50AC29

File attributes

The English (United States) version of this update installs files that have the attributes that are listed in the following tables. The dates and the times for these files are listed in Coordinated Universal Time (UTC). The dates and the 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 the times may change when you perform certain operations on the files.For all supported x86-based systemsFile name	File version	File size	Date	Time
system.dll	2.0.50727.8791	3,207,168	13-Jul-2018	16:20
big5.nlp		66,728	16-Jun-2018	05:11
bopomofo.nlp		82,172	16-Jun-2018	05:11
ksc.nlp		116,756	16-Jun-2018	05:11
mscorlib.dll	2.0.50727.8793	4,554,752	24-Jul-2018	16:53
normidna.nlp		59,342	16-Jun-2018	05:12
normnfc.nlp		45,794	16-Jun-2018	05:12
normnfd.nlp		39,284	16-Jun-2018	05:12
normnfkc.nlp		66,384	16-Jun-2018	05:12
normnfkd.nlp		60,294	16-Jun-2018	05:12
prc.nlp		83,748	16-Jun-2018	05:12
prcp.nlp		83,748	16-Jun-2018	05:12
sortkey.nlp		262,148	16-Jun-2018	05:12
sorttbls.nlp		20,320	16-Jun-2018	05:12
xjis.nlp		28,288	16-Jun-2018	05:13
mscordacwks.dll	2.0.50727.8793	991,808	24-Jul-2018	16:53
mscorsvc.dll	2.0.50727.8793	231,992	24-Jul-2018	16:53
mscorwks.dll	2.0.50727.8793	5,948,472	24-Jul-2018	16:53
sos.dll	2.0.50727.8793	391,216	24-Jul-2018	16:53
For all supported x64-based systemsFile name	File version	File size	Date	Time
—	—	—	—	—
big5.nlp		66,728	16-Jun-2018	05:09
bopomofo.nlp		82,172	16-Jun-2018	05:09
ksc.nlp		116,756	16-Jun-2018	05:09
mscorlib.dll	2.0.50727.8793	4,571,136	24-Jul-2018	16:53
normidna.nlp		59,342	16-Jun-2018	05:10
normnfc.nlp		45,794	16-Jun-2018	05:10
normnfd.nlp		39,284	16-Jun-2018	05:10
normnfkc.nlp		66,384	16-Jun-2018	05:10
normnfkd.nlp		60,294	16-Jun-2018	05:10
prc.nlp		83,748	16-Jun-2018	05:10
prcp.nlp		83,748	16-Jun-2018	05:10
sortkey.nlp		262,148	16-Jun-2018	05:10
sorttbls.nlp		20,320	16-Jun-2018	05:10
xjis.nlp		28,288	16-Jun-2018	05:10
mscordacwks.dll	2.0.50727.8793	1,758,784	24-Jul-2018	16:53
mscorsvc.dll	2.0.50727.8793	495,232	24-Jul-2018	16:53
mscorwks.dll	2.0.50727.8793	10,008,632	24-Jul-2018	16:53
sos.dll	2.0.50727.8793	486,008	24-Jul-2018	16:53
system.dll	2.0.50727.8791	3,207,168	13-Jul-2018	16:20
system.dll	2.0.50727.8791	3,207,168	13-Jul-2018	16:20
big5.nlp		66,728	16-Jun-2018	05:11
bopomofo.nlp		82,172	16-Jun-2018	05:11
ksc.nlp		116,756	16-Jun-2018	05:11
mscorlib.dll	2.0.50727.8793	4,554,752	24-Jul-2018	16:53
normidna.nlp		59,342	16-Jun-2018	05:12
normnfc.nlp		45,794	16-Jun-2018	05:12
normnfd.nlp		39,284	16-Jun-2018	05:12
normnfkc.nlp		66,384	16-Jun-2018	05:12
normnfkd.nlp		60,294	16-Jun-2018	05:12
prc.nlp		83,748	16-Jun-2018	05:12
prcp.nlp		83,748	16-Jun-2018	05:12
sortkey.nlp		262,148	16-Jun-2018	05:12
sorttbls.nlp		20,320	16-Jun-2018	05:12
xjis.nlp		28,288	16-Jun-2018	05:13
mscordacwks.dll	2.0.50727.8793	991,808	24-Jul-2018	16:53
mscorsvc.dll	2.0.50727.8793	231,992	24-Jul-2018	16:53
mscorwks.dll	2.0.50727.8793	5,948,472	24-Jul-2018	16:53
sos.dll	2.0.50727.8793	391,216	24-Jul-2018	16:53
For all supported IA64-based systemsFile name	File version	File size	Date	Time
—	—	—	—	—
big5.nlp		66,728	16-Jun-2018	05:14
bopomofo.nlp		82,172	16-Jun-2018	05:14
ksc.nlp		116,756	16-Jun-2018	05:14
mscorlib.dll	2.0.50727.8793	4,014,080	24-Jul-2018	16:53
normidna.nlp		59,342	16-Jun-2018	05:14
normnfc.nlp		45,794	16-Jun-2018	05:14
normnfd.nlp		39,284	16-Jun-2018	05:14
normnfkc.nlp		66,384	16-Jun-2018	05:14
normnfkd.nlp		60,294	16-Jun-2018	05:14
prc.nlp		83,748	16-Jun-2018	05:14
prcp.nlp		83,748	16-Jun-2018	05:14
sortkey.nlp		262,148	16-Jun-2018	05:14
sorttbls.nlp		20,320	16-Jun-2018	05:14
xjis.nlp		28,288	16-Jun-2018	05:15
mscordacwks.dll	2.0.50727.8793	3,083,400	24-Jul-2018	16:53
mscorsvc.dll	2.0.50727.8793	602,752	24-Jul-2018	16:53
mscorwks.dll	2.0.50727.8793	20,404,864	24-Jul-2018	16:53
sos.dll	2.0.50727.8793	873,592	24-Jul-2018	16:53
system.dll	2.0.50727.8791	3,207,168	13-Jul-2018	16:20
system.dll	2.0.50727.8791	3,207,168	13-Jul-2018	16:20
big5.nlp		66,728	16-Jun-2018	05:11
bopomofo.nlp		82,172	16-Jun-2018	05:11
ksc.nlp		116,756	16-Jun-2018	05:11
mscorlib.dll	2.0.50727.8793	4,554,752	24-Jul-2018	16:53
normidna.nlp		59,342	16-Jun-2018	05:12
normnfc.nlp		45,794	16-Jun-2018	05:12
normnfd.nlp		39,284	16-Jun-2018	05:12
normnfkc.nlp		66,384	16-Jun-2018	05:12
normnfkd.nlp		60,294	16-Jun-2018	05:12
prc.nlp		83,748	16-Jun-2018	05:12
prcp.nlp		83,748	16-Jun-2018	05:12
sortkey.nlp		262,148	16-Jun-2018	05:12
sorttbls.nlp		20,320	16-Jun-2018	05:12
xjis.nlp		28,288	16-Jun-2018	05:13
mscordacwks.dll	2.0.50727.8793	991,808	24-Jul-2018	16:53
mscorsvc.dll	2.0.50727.8793	231,992	24-Jul-2018	16:53
mscorwks.dll	2.0.50727.8793	5,948,472	24-Jul-2018	16:53
sos.dll	2.0.50727.8793	391,216	24-Jul-2018	16:53

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