Option 3: Switch to WinRM transport protocol (Firewall should be running PAN-OS 9.0 and above version). You should consider implementing either option 3 or 4 before March 2023. So, disabling the registry key is only a temporary workaround. Starting from 14 March 2023, hardening changes in DCOM will be enabled by default and customers will NOT have the ability to disable the registry key. You must restart your device after setting this registry key for it to take effect. Note: You must enter Value Data in hexadecimal format. Value Name: "RequireIntegrityActivationAuthenticationLevel".Path : HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\AppCompat.If this is not an option for you, consider one of the remaining options listed below. In order to resolve this issue, you can disable the registry key RequireIntegrityActivationAuthenticationLevel on the Windows server hosting the Domain Controller(s). If this is not an option for you, consider one of the options listed below. Rolling back June 8th security patches on the Windows server hosting the Domain controller(s) resolves this issue. You can resolve this issue using one of the following workarounds: By this point, you must resolve any compatibility issues with the hardening changes and applications in your environment. Hardening changes enabled by default with no ability to disable them. Hardening changes enabled by default but with the ability to disable them using a registry key. Hardening changes disabled by default but with the ability to enable them using a registry key. Please raise the activation authentication level at least to RPC_C_AUTHN_LEVEL_PKT_INTEGRITY in client application Here is a timeline of the hardening changes as described in Microsoft KB5004442 : as described in Microsoft KB5004442: The server-side authentication level policy does not allow the user from address to activate DCOM server. As a result of these hardening changes, the following system errors are seen on Domain Controller(s) every 2 seconds. Įnabling this registry key will make RPC servers enforce an Authentication-Level of RPC_C_AUTHN_LEVEL_PKT_INTEGRITY or higher. To address the vulnerability described in CVE-2021-26414, customers must install updates released on Jand enable the registry key “ HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Ole\AppCompat” as per the instructions in KB5004442. On June 8th 2021, Microsoft released a set of patches in response to CVE-2021-26414 as part of its monthly patch release. WMI transport Protocol for Server Monitoring Windows Server hosting the Domain Controller(s)
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