KB4517389

詳細情報

KB番号	KB4517389
リリース日	2019/10/08
Windowsバージョン	Windows 10 1903
ビルド番号	18362.418
URL(英語)	https://support.microsoft.com/en-us/help/4517389
URL(日本語)	https://support.microsoft.com/ja-jp/help/4517389
ダウンロード	Microsoft Update Catalog

Addresses an issue in security bulletin CVE-2019-1318 that may cause client or server computers that don’t support Extended Master Secret (EMS) RFC 7627 to have increased connection latency and CPU utilization. This issue occurs while performing full Transport Layer Security (TLS) handshakes from devices that don’t support EMS, especially on servers. EMS support has been available for all the supported versions of Windows since calendar year 2015 and is being incrementally enforced by the installation of the October 8, 2019 and later monthly updates.
Addresses an issue with applications and printer drivers that utilize the Windows JavaScript engine (jscript.dll) for processing print jobs.
Security updates to Windows Shell, Internet Explorer, Microsoft Edge, Windows App Platform and Frameworks, Windows Cryptography, Windows Authentication, Windows Storage and Filesystems, Windows Kernel, Microsoft Scripting Engine, and Windows Server.

When setting up a new Windows device during the Out of Box Experience (OOBE), you might be unable to create a local user when using Input Method Editor (IME). This issue might affect you if you are using the IME for Chinese, Japanese, or Korean languages. Note This issue does not affect using a Microsoft Account during OOBE.	This issue is resolved in KB4530684.
Updates for Windows released October 8, 2019 or later provide protections, tracked by CVE-2019-1318, against an attack that could allow unauthorized access to information or data within TLS connections. This type of attack is known as a man-in-the-middle exploit. Windows might fail to connect to TLS clients and servers that do not support Extended Master Secret for resumption (RFC 7627). Lack of RFC support might cause one or more of the following errors or logged events: "The request was aborted: Could not create SSL/TLS secure Channel" SCHANNEL event 36887 is logged in the System event log with the description, "A fatal alert was received from the remote endpoint. The TLS protocol defined fatal alert code is 20."	For information, see KB4528489.

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