October 10, 2023—KB5031361 (OS Build 17763.4974)

Highlights 

• This update supports daylight saving time (DST) changes in Greenland.

• This update addresses security issues for your Windows operating system. 

Improvements

This security update includes improvements. When you install this KB: 

• New! This update completes the work to comply with the GB18030-2022 requirements. It removes and remaps characters for Microsoft Wubi input and Microsoft Pinyin U-mode input. You can no longer enter character codepoints that are not supported. All the required codepoints are up to date.

• New! This update adds Azure Arc Optional Component related links to Server Manager. Now, you can turn on Arc on your servers. You do not need to run a PowerShell script.

• This update changes the spelling of Ukraine's capital from Kiev to Kyiv.

• This update addresses an issue that affects scheduled tasks. Tasks that call the credential manager API might fail. This occurs if you select [Run only when user is logged on] and [Run with highest privileges].

• This update addresses an issue that stops you from getting the IE mode windows list.

• This update addresses an issue that affects external binding. It fails. This occurs after you install Windows updates dated May 2023 or later. Because of this, there are issues that affect LDAP queries and authentication.

• This update addresses an issue that affects those who enable the “Smart Card is Required for Interactive Logon” account option. When RC4 is disabled, you cannot authenticate to Remote Desktop Services farms. The error message is, "An authentication error has occurred. The requested encryption type is not supported by the KDC.”

• This update addresses an issue that affects Kerberos delegation. It might fail in the wrong way. The error code is 0xC000006E (STATUS_ACCOUNT_RESTRICTION). This issue might occur when you mark the intermediate service account as “This account is sensitive and cannot be delegated” in Active Directory. Applications might also return the error message, “System.Security.Authentication.AuthenticationException: Failed to initialize security context. Error code was -2146893042.”

• This update affects Windows Filtering Platform (WFP) connections. The redirect diagnostics for them has improved.

• This update addresses an issue that affects a relying party. When you sign out of it, a SAML request cookie is not cleared. Because of this, your device automatically attempts to connect to the same relying party when you sign in again.

• This update addresses an issue that affects the Server Message Block (SMB) client. It does not reconnect all the persistent handles when the reauthentication of a session fails.

• To protect against CVE-2023-44487, you should install the latest Windows update. Based on your use case, you can also set the limit of the RST_STREAMS per minute using the new registry key in this update. 

  You can create the DWORD registry values in the table below under the following registry key: HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\HTTP\Parameters

  These keys are not present by default when you install this KB. You can create them as required to set new values for your environment.

  Registry key	Default value	Valid value range	Registry key function
  Http2MaxClientResetsPerMinute	500	0–65535	Sets the allowed number of resets (RST_STREAMS) per minute for a connection. When you reach this limit, the connection ends.

If you installed earlier updates, only the new updates contained in this package will be downloaded and installed on your device.

For more information about security vulnerabilities, please refer to the new Security Update Guide website and the October 2023 Security Updates.

Known issues in this update

How to get this update

Before installing this update

Microsoft now combines the latest servicing stack update (SSU) for your operating system with the latest cumulative update (LCU). SSUs improve the reliability of the update process to mitigate potential issues while installing the LCU. For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions. 

Prerequisite:

You must install the August 10, 2021 SSU (KB5005112) before installing the LCU. 

Install this update

File information

For a list of the files that are provided in this update, download the file information for cumulative update 5031361.

For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 17763.4965.