October 10, 2023 Security update (KB5031364)

Improvements 

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

• New!  This update adds an Azure Arc Setup Optional Component. It includes a new Azure Arc system tray icon and a new Server Manager entry for Azure Arc Management. There is also a graphical installer for the Azure Connected Machine agent. Now, you can turn on Azure Arc using just a few clicks. You do not need to run a PowerShell script. To learn more, see Connect Windows Server machines to Azure through Azure Arc Setup.

• 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.

• This update addresses a race condition. This occur when codepages load during the early part of startup. This leads to stop error a 0x7e.

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

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

• 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 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 addresses an issue that affects PCI devices. You might get an error when you turn on Kernel Direct Memory Access (DMA) protection.

• This update improves the efficiency and performance of the Recommended Troubleshooter.

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

• 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 affects Active Directory event ID 1644 processing. It now accepts events that are more than 64 KB in length. This change truncates Lightweight Directory Access Protocol (LDAP) queries that are in event 1644 to 20000 characters by default. You can configure the 20K value using the registry key "DEFAULT_DB_EXPENSIVE_SEARCH_FILTER_MAX_LOGGING_LENGTH_IN_CHARS."

• 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 I/O over Server Message Block (SMB). It might fail when you use the LZ77+Huffman compression algorithm.

• 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 keys in this update.

  Registry key	Default value	Valid value range	Registry key function
  Http2MaxClientResetsPerMinute	400	0–65535	Sets the allowed number of resets (RST_STREAMS) per minute for a connection. When you reach this limit, a GOAWAY message is sent to client for the connection.
  Http2MaxClientResetsGoaway	1	0-1	Disables or enables the GOAWAY message to send when you reach the limit. If you set this to 0, the connection ends as soon as you reach the limit.

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

To return to the Azure Stack HCI documentation site

Known issues in this update

Microsoft is not currently aware of any issues with 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). For general information about SSUs, see Servicing stack updates and Servicing Stack Updates (SSU): Frequently Asked Questions.

To install the LCU on your Azure Stack HCI cluster, see Update Azure Stack HCI clusters.

Install this update

File Information

For a list of the files that are provided in this update, download the file information for cumulative update 5031364.

For a list of the files that are provided in the servicing stack update, download the file information for the SSU - version 20349.2032.