To help reduce app compatibility issues, we have automatically raised the authentication level for all non-anonymous activation requests from Windows-based DCOM clients to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY at a minimum. Windows Server 2016, Windows 10, version 1607Ĭlient-side request auto-elevation patch Authentication level for all non-anonymous activation requests Windows Server 2019, Windows 10, version 1809 Windows 10, version 2004, Windows 10, version 20H2, Windows 10, version 21H1 These error events are only available for a subset of Windows versions see the table below. (%1 – Application Path, %2 – Application PID, %3 – CLSID of the COM class the application is requesting to activate, %4 – Computer Name, %5 – Value of Authentication Level) To raise the activation authentication level, please contact the application vendor." The lowest activation authentication level required by DCOM is 5(RPC_C_AUTHN_LEVEL_PKT_INTEGRITY). "Application %1 with PID %2 is requesting to activate CLSID %3 on computer %4 with default activation authentication level at %5. "Application %1 with PID %2 is requesting to activate CLSID %3 on computer %4 with explicitly set authentication level at %5. (%1 – domain, %2 – user name, %3 – User SID, %4 – Client IP Address)Ĭlient Events – Indicate which application is sending lower-level requests Please raise the activation authentication level at least to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY in client application." "The server-side authentication level policy does not allow the user %1\%2 SID (%3) from address %4 to activate DCOM server. Server Events - Indicate server is receiving lower-level requests You can trace to the client device from the server-side event log and use client-side event logs to find the application. The system will log these events if it detects that a DCOM client application is trying to activate a DCOM server using an authentication level that is less than RPC_C_AUTHN_LEVEL_PKT_INTEGRITY. To help you identify the applications that might have compatibility issues after we enable DCOM security hardening changes, we added new DCOM error events in the System log. Testing for DCOM hardening compatibility New DCOM Error Events By this point, you must resolve any compatibility issues with the hardening changes and applications in your environment. Phase 3 Release - Hardening changes enabled by default with no ability to disable them. Phase 2 Release - Hardening changes enabled by default but with the ability to disable them using a registry key. Phase 1 Release - Hardening changes disabled by default but with the ability to enable them using a registry key. It will keep the DCOM hardening enabled and remove the ability to disable it. The final phase of DCOM updates will be released in March 2023. That changed the hardening to enabled by default but retained the ability to disable the changes using registry key settings. The second phase of DCOM updates was released on June 14, 2022. You can enable them by modifying the registry as described in the “Registry setting to enable or disable the hardening changes” section below. In that update, DCOM hardening was disabled by default. The first phase of DCOM updates was released on June 8, 2021. For more information and context about how we are hardening DCOM, see DCOM authentication hardening: what you need to know. They also provide capabilities that we have added to support migration. They provide advanced protections from the latest security threats. Note We highly recommend that you install the latest security update available. Therefore, we recommended that you verify if client or server applications in your environment that use DCOM or RPC work as expected with the hardening changes enabled. Hardening changes in DCOM were required for CVE-2021-26414. DCOM is used for communication between the software components of networked devices. The Distributed Component Object Model (DCOM) Remote Protocol is a protocol for exposing application objects using remote procedure calls (RPCs).
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