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
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All updates for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 require the d3dcompiler_47.dll to be installed. We recommend that you install the included d3dcompiler_47.dll before you apply this update. For more information about the d3dcompiler_47.dll, see KB 4019990.
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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
The following articles contain additional information about this security update as it relates to individual product versions. The articles may contain known issue information.
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4344152 Description of the Security and Quality Rollup for .NET Framework 3.5.1 for Windows 7 SP1 and Windows Server 2008 R2 SP1 (KB 4344152)
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4344149 Description of the Security and Quality Rollup for .NET Framework 4.5.2 for Windows 7 SP1, Server 2008 R2 SP1 and Server 2008 SP2 (KB 4344149)
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4344146 Description of the Security and Quality Rollup for .NET Framework 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, and 4.7.2 for Windows 7 SP1, Server 2008 R2 SP1 and for .NET Framework 4.6 for Server 2008 SP2 (KB 4344146)
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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Security solutions for IT professionals: TechNet Security Support and Troubleshooting
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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
