Description of the Security Only update for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1, and Server 2008 SP2 (KB 4344173)

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 and 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)For more information about this security update as it relates to Windows Server 2008 SP2, see the following article in the Microsoft Knowledge Base:4345682 Security Only updates for .NET Framework 2.0 SP2, 3.0 SP2, 4.5.2 and 4.6 for Windows Server 2008 SP2 (KB 4345682)

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.

• For Windows 7 SP1 and Windows Server 2008 R2 SP1, go to update KB 4345679.
• For Windows Server 2008, go to update KB 4345682.

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. Type4345679for Windows 7 SP1 and Windows Server 2008 R2 SP1 or type4345682for Windows Server 2008 SP2 in 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 4020507.

File information

File hash

File name	SHA1 hash	SHA256 hash
NDP45-KB4344173-x64.exe	DFE292179D0EC314BEFE2C9C1B72F1B8E40882F1	518517C3823F4421CCA3DAAAEE8CE48AFA091F74C33D3512E0A3E06B5B592F44
NDP45-KB4344173-x86.exe	15580CE80ECBE44BA48C1DDFDEA40D2FD4D8B915	C03D41FC29A61EB52178C226E5FE992C4A4F151FAE8511631DD713173AB9CDD3

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
clr.dll	4.0.30319.36460	6,939,640	27-Jul-2018	07:43
clrjit.dll	4.0.30319.36460	510,464	27-Jul-2018	07:43
mscordacwks.dll	4.0.30319.36460	1,284,232	27-Jul-2018	07:43
mscordbi.dll	4.0.30319.36460	1,107,576	27-Jul-2018	07:43
mscorlib.dll	4.0.30319.36460	5,266,072	27-Jul-2018	07:43
peverify.dll	4.0.30319.36460	163,968	27-Jul-2018	07:44
SOS.dll	4.0.30319.36460	762,472	27-Jul-2018	07:43
System.dll	4.0.30319.36460	3,490,240	27-Jul-2018	07:43
msvcp120_clr0400.dll	12.0.52460.36460	536,736	27-Jul-2018	07:43
msvcr120_clr0400.dll	12.0.52460.36460	875,672	27-Jul-2018	07:43
For all supported x64-based systemsFile name	File version	File size	Date	Time
—	—	—	—	—
clr.dll	4.0.30319.36460	10,070,120	27-Jul-2018	08:20
clr.dll	4.0.30319.36460	6,939,640	27-Jul-2018	07:43
clrjit.dll	4.0.30319.36460	1,234,552	27-Jul-2018	08:20
clrjit.dll	4.0.30319.36460	510,464	27-Jul-2018	07:43
mscordacwks.dll	4.0.30319.36460	1,731,208	27-Jul-2018	08:20
mscordacwks.dll	4.0.30319.36460	1,284,232	27-Jul-2018	07:43
mscordbi.dll	4.0.30319.36460	1,533,568	27-Jul-2018	08:20
mscordbi.dll	4.0.30319.36460	1,107,576	27-Jul-2018	07:43
mscorlib.dll	4.0.30319.36460	5,219,968	27-Jul-2018	08:20
mscorlib.dll	4.0.30319.36460	5,266,072	27-Jul-2018	07:43
peverify.dll	4.0.30319.36460	225,920	27-Jul-2018	08:20
peverify.dll	4.0.30319.36460	163,968	27-Jul-2018	07:44
SOS.dll	4.0.30319.36460	822,888	27-Jul-2018	08:20
SOS.dll	4.0.30319.36460	762,472	27-Jul-2018	07:43
System.dll	4.0.30319.36460	3,490,240	27-Jul-2018	07:43
msvcp120_clr0400.dll	12.0.52460.36460	678,584	27-Jul-2018	08:20
msvcp120_clr0400.dll	12.0.52460.36460	536,736	27-Jul-2018	07:43
msvcr120_clr0400.dll	12.0.52460.36460	869,536	27-Jul-2018	08:20
msvcr120_clr0400.dll	12.0.52460.36460	875,672	27-Jul-2018	07:43

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