February 9, 2021—KB4601349 (Security-only update)

IMPORTANT Windows 8.1 and Windows Server 2012 R2 have reached the end of mainstream support and are now in extended support. Starting in July 2020, there will no longer be optional, non-security releases (known as «C» releases) for this operating system. Operating systems in extended support have only cumulative monthly security updates (known as the «B» or Update Tuesday release).

For information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article. To view other notes and messages, see the Windows 8.1 and Windows Server 2012 R2 update history home page.

Improvements and fixes

This security update includes quality improvements. Key changes include:

Adds historical daylight saving time (DST) updates and corrections for the Palestinian Authority.

Addresses an issue with German translations of Central European Time.

Updates the Netlogon Elevation of Privilege Vulnerability (CVE-2020-1472) to enable Enforcement mode. For more details, see CVE-2020-1472 and How to manage the changes in Netlogon secure channel connections associated with CVE-2020-1472.

Security updates to Windows App Platform and Frameworks, Windows Hybrid Cloud Networking, and Windows Core Networking.

For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.

Known issues in this update

Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

Perform the operation from a process that has administrator privilege.

Perform the operation from a node that doesn’t have CSV ownership.

Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update

Before installing this update

We strongly recommend that you install the latest servicing stack update (SSU) for your operating system before you install the latest Rollup. SSUs improve the reliability of the update process to mitigate potential issues while installing the Rollup and applying Microsoft security fixes. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

If you use Windows Update, the latest SSU (KB4566425) will be offered to you automatically. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog.

REMINDER If you are using Security-only updates, you will also need to install all previous Security-only updates and the latest cumulative update for Internet Explorer (KB4586768).

Вторник патчей (февраль 2021): Microsoft исправила 56 проблем безопасности, в том числе угрозу нулевого дня в Windows

В феврале 2021 года компании удалось исправить 56 уязвимостей безопасности, причем случаи эксплуатации одной из них были зарегистрированы в сети.

Уязвимость «нулевого» дня с идентификатором CVE-2021-1732 связана с повышением привилегий в корневом компоненте ОС Win32k.

Эксплуатация данной уязвимости позволяла злоумышленникам получить доступ уровня SYSTEM в атакуемых системах. Подробности об атаках не сообщаются. Microsoft лишь сообщает, что инциденты с эксплуатацией были обнаружены китайской компанией DBAPPSecurity.

Известные уязвимости

Кроме угрозы нулевого дня, в февральский «Вторник Патчей» Microsoft исправила несколько уязвимостей, подробности которых были обнародованы еще до того, как для них стали доступны исправления.

В общей сложности, в сети была опубликована информация о шести ошибках безопасности в продуктах Microsoft, а именно:

• CVE-2021-1721 – уязвимость в .NET Core и Visual Studio, связанная с отказом в обслуживании
• CVE-2021-1733 – уязвимость в Sysinternals PsExec, связанная с повышением привилегий
• CVE-2021-26701 – уязвимость в .NET Core, связанная с удаленным выполнением кода
• CVE-2021-1727 – уязвимость установщика Windows, связанная с повышением привилегий
• CVE-2021-24098 – уязвимость драйвера консоли Windows, связанная с отказом в обслуживании
• CVE-2021-24106 – уязвимость в Windows DirectX, связанная с раскрытием информации

Отметим, что случаи эксплуатации данных уязвимостей не были зарегистрированы.

Microsoft предупреждает о трех опасных уязвимостях в стеке TCP/IP в Windows

Microsoft также выпустила исправления трех уязвимостей стека TCP/IP в Windows, который предназначен для подключения устройства к Интернету.

Две проблемы безопасности под идентификаторами CVE-2021-24074 и CVE-2021-24094 позволяли злоумышленникам удаленно исполнять произвольный код на уязвимых системах.

Третья уязвимость CVE-2021-24086 могла вызывать сбой на устройствах Windows.

В своем блоге Microsoft так описывает данные ошибки:

Две уязвимости удаленного выполнения кода являются сложными для эксплуатации, поэтому в краткосрочной перспективе не стоит ожидать атак с их использованием.

Однако, мы считаем, что злоумышленники смогут создавать DoS-эксплойты намного быстрее, и ожидаем, что все три проблемы могут быть использованы с помощью DoS-атаки вскоре после выпуска.

Поэтому мы рекомендуем клиентам как можно скорее установить обновления безопасности для систем Windows.

Из всех систем Windows установки Windows Server больше всего подвержены данным атакам, поскольку такие системы часто используются для размещения веб-серверов или облачной инфраструктуры и почти наверняка постоянно подключены к Интернету и подвержены атакам.

Если нет возможности сразу развернуть патч, то Microsoft предлагает использовать обходные решения, подробности приведены в бюллетенях безопасности.

January 12, 2021—KB4598289 (Security-only update)

IMPORTANT Verify that you have installed the required updates listed in the How to get this update section before installing this update.

For information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article. To view other notes and messages, see the Windows 7 SP1 and Windows Server 2008 R2 SP1 update history home page.

Improvements and fixes

This security update includes quality improvements. Key changes include:

Security updates to Windows App Platform and Frameworks, Windows Graphics, Windows Media, Windows Fundamentals, Windows Cryptography, Windows Virtualization, and Windows Hybrid Storage Services.

For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.

Known issues in this update

After installing this update and restarting your device, you might receive the error, “Failure to configure Windows updates. Reverting Changes. Do not turn off your computer,” and the update might show as Failed in Update History.

This is expected in the following circumstances:

If you are installing this update on a device that is running an edition that is not supported for ESU. For a complete list of which editions are supported, see KB4497181.

If you do not have an ESU MAK add-on key installed and activated.

If you have purchased an ESU key and have encountered this issue, please verify you have applied all prerequisites and that your key is activated. For information on activation, please see this blog post. For information on the prerequisites, see the «How to get this update» section of this article.

Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

Perform the operation from a process that has administrator privilege.

Perform the operation from a node that doesn’t have CSV ownership.

Microsoft is working on a resolution and will provide an update in an upcoming release.

How to get this update

Before installing this update

IMPORTANT Customers who have purchased the Extended Security Update (ESU) for on-premises versions of these operating systems must follow the procedures in KB4522133 to continue receiving security updates after extended support ends. Extended support ends as follows:

For Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1, extended support ends on January 14, 2020.

For Windows Embedded Standard 7, extended support ends on October 13, 2020.

For more information about ESU and which editions are supported, see KB4497181.

Note For Windows Embedded Standard 7, Windows Management Instrumentation (WMI) must be enabled to get updates from Windows Update or Windows Server Update Services.

You must install the updates listed below and restart your device before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes.

The March 12, 2019 servicing stack update (SSU) (KB4490628). To get the standalone package for this SSU, search for it in the Microsoft Update Catalog. This update is required to install updates that are only SHA-2 signed.

The latest SHA-2 update (KB4474419) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. This update is required to install updates that are only SHA-2 signed. For more information on SHA-2 updates, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.

For Windows Thin PC, you must have the August 11, 2020 SSU (KB4570673) or a later SSU installed to make sure you continue to get the extended security updates starting with the October 13, 2020 updates.

To get this security update, you must reinstall the «Extended Security Updates (ESU) Licensing Preparation Package» (KB4538483) or the «Update for the Extended Security Updates (ESU) Licensing Preparation Package» (KB4575903) even if you previously installed the ESU key. The ESU licensing preparation package will be offered to you from WSUS. To get the standalone package for ESU licensing preparation package, search for it in the Microsoft Update Catalog.

After installing the items above, Microsoft strongly recommends that you install the latest SSU (KB4592510). If you are using Windows Update, the latest SSU will be offered to you automatically if you are an ESU customer. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

REMINDER If you are using Security-only updates, you will also need to install all previous Security-only updates and the latest cumulative update for Internet Explorer (KB4586768).

March 9, 2021—KB5000851 (Security-only update)

Important: Verify that you have installed the required updates listed in the How to get this update section before installing this update.

Important: For information about the various types of Windows updates, such as critical, security, driver, service packs, and so on, please see the following article. To view other notes and messages, see the Windows 7 SP1 and Windows Server 2008 R2 SP1 update history home page.

Improvements and fixes

This security update includes quality improvements. Key changes include:

Addresses an issue in which a non-native device that is in the same realm does not receive a Kerberos Service ticket from Active Directory DCs. This issue occurs even though Windows Updates are installed that contain CVE-2020-17049 protections released between November 10 and December 8, 2020 and configured PerfromTicketSignature to 1 or larger. Ticket acquisition fails with KRB_GENERIC_ERROR if callers submit a PAC-less Ticket Granting Ticket (TGT) as an evidence ticket without the USER_NO_AUTH_DATA_REQUIRED flag being set for the user in User Account Controls.

Security updates to Windows Fundamentals, Windows Shell, Windows UAC, Windows Hybrid Cloud Networking, and Windows Media.

For more information about the resolved security vulnerabilities, please refer to the new Security Update Guide website.

Known issues in this update

After installing this update and restarting your device, you might receive the error, “Failure to configure Windows updates. Reverting Changes. Do not turn off your computer,” and the update might show as Failed in Update History.

This is expected in the following circumstances:

If you are installing this update on a device that is running an edition that is not supported for ESU. For a complete list of which editions are supported, see KB4497181.

If you do not have an ESU MAK add-on key installed and activated.

If you have purchased an ESU key and have encountered this issue, please verify you have applied all prerequisites and that your key is activated. For information on activation, please see this blog post. For information on the prerequisites, see the «How to get this update» section of this article.

Certain operations, such as rename, that you perform on files or folders that are on a Cluster Shared Volume (CSV) may fail with the error, “STATUS_BAD_IMPERSONATION_LEVEL (0xC00000A5)”. This occurs when you perform the operation on a CSV owner node from a process that doesn’t have administrator privilege.

Do one of the following:

Perform the operation from a process that has administrator privilege.

Perform the operation from a node that doesn’t have CSV ownership.

Microsoft is working on a resolution and will provide an update in an upcoming release.

After installing updates released March 9, 2021, you might get unexpected results when printing from some apps. Issues might include:

Elements of the document might print as solid black/color boxes or might be missing, including barcodes, QR codes, and graphics elements, such as logos.

Table lines might be missing. Other alignment or formatting issues might also be present.

Printing from some apps or to some printers might result in a blank page or label.

This issue is resolved in KB5001639.

How to get this update

Before installing this update

IMPORTANT Customers who have purchased the Extended Security Update (ESU) for on-premises versions of these operating systems must follow the procedures in KB4522133 to continue receiving security updates after extended support ends. Extended support ends as follows:

For Windows 7 Service Pack 1 and Windows Server 2008 R2 Service Pack 1, extended support ends on January 14, 2020.

For Windows Embedded Standard 7, extended support ends on October 13, 2020.

For more information about ESU and which editions are supported, see KB4497181.

Note For Windows Embedded Standard 7, Windows Management Instrumentation (WMI) must be enabled to get updates from Windows Update or Windows Server Update Services.

You must install the updates listed below and restart your device before installing the latest Rollup. Installing these updates improves the reliability of the update process and mitigates potential issues while installing the Rollup and applying Microsoft security fixes.

The March 12, 2019 servicing stack update (SSU) (KB4490628). To get the standalone package for this SSU, search for it in the Microsoft Update Catalog. This update is required to install updates that are only SHA-2 signed.

The latest SHA-2 update (KB4474419) released September 10, 2019. If you are using Windows Update, the latest SHA-2 update will be offered to you automatically. This update is required to install updates that are only SHA-2 signed. For more information on SHA-2 updates, see 2019 SHA-2 Code Signing Support requirement for Windows and WSUS.

For Windows Thin PC, you must have the August 11, 2020 SSU (KB4570673) or a later SSU installed to make sure you continue to get the extended security updates starting with the October 13, 2020 updates.

To get this security update, you must reinstall the «Extended Security Updates (ESU) Licensing Preparation Package» (KB4538483) or the «Update for the Extended Security Updates (ESU) Licensing Preparation Package» (KB4575903) even if you previously installed the ESU key. The ESU licensing preparation package will be offered to you from WSUS. To get the standalone package for ESU licensing preparation package, search for it in the Microsoft Update Catalog.

After installing the items above, Microsoft strongly recommends that you install the latest SSU (KB4592510). If you are using Windows Update, the latest SSU will be offered to you automatically if you are an ESU customer. To get the standalone package for the latest SSU, search for it in the Microsoft Update Catalog. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

REMINDER If you are using Security-only updates, you will also need to install all previous Security-only updates and the latest cumulative update for Internet Explorer (KB5000800).