Microsoftは本日、Version 1511を除く全てのWindows 10のバージョンに対し、定例外の累積アップデートを公開しました(Neowin)。
公開された累積アップデートは以下の通りです。
- Windows 10 Version 1903: KB4522016
- Windows 10 Version 1809: KB4522015
- Windows 10 version 1803: KB4522014
- Windows 10 version 1709: KB4522012
- Windows 10 version 1703: KB4522011
- Windows 10 version 1607: KB4522010
- Windows 10 Version 1507: KB4522009
各累積アップデートのドキュメントにはIEのセキュリティアップデートが行われたとしか説明されていませんが、「CVE-2019-1367 | Scripting Engine Memory Corruption Vulnerability」に脆弱性の内容が詳しく説明されており、スクリプトエンジンがInternet Explorerのメモリ内のオブジェクトを処理する方法にリモートコード実行の脆弱性が存在した模様です。
A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer. The vulnerability could corrupt memory in such a way that an attacker could execute arbitrary code in the context of the current user. An attacker who successfully exploited the vulnerability could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.
In a web-based attack scenario, an attacker could host a specially crafted website that is designed to exploit the vulnerability through Internet Explorer and then convince a user to view the website, for example, by sending an email.
The security update addresses the vulnerability by modifying how the scripting engine handles objects in memory.
なお今回の累積アップデートはWindows Updateでは配布されておらず、Microsoft Update Catalogからダウンロードする必要があります。