202301 - Exchange onpreme - PowerShell Serialization Payload Signing

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Released: January 2023 Exchange Server Security Updates
https://techcommunity.microsoft.com/t5/exchange-team-blog/released-january-2023-exchange-server-security-updates/ba-p/3711808



https://microsoft.github.io/CSS-Exchange/Diagnostics/HealthChecker/SerializedDataSigningCheck/

1.  Update KB5022143 (Exchange SU)


2. Run latest HealthCherker




3. 
PowerShell Serialization Payload Signing
https://microsoft.github.io/CSS-Exchange/Diagnostics/HealthChecker/SerializedDataSigningCheck/


Certificate signing of PowerShell serialization payload in Exchange Server
https://support.microsoft.com/en-us/topic/certificate-signing-of-powershell-serialization-payload-in-exchange-server-90fbf219-b0dd-4b2c-8a68-9d73b3309eb1






4. MonitorExchangeAuthCertificate
   https://microsoft.github.io/CSS-Exchange/Admin/MonitorExchangeAuthCertificate/





5. 

            
New-SettingOverride -Name "EnableSigningVerification" -Component Data -Section EnableSerializationDataSigning -Parameters @("Enabled=true") -Reason "Enabling Signing Verification"





6. 


Get-ExchangeDiagnosticInfo -Process Microsoft.Exchange.Directory.TopologyService -Component VariantConfiguration -Argument Refresh 



7. 


Restart-Service -Name W3SVC, WAS -Force 


8. 
SerializedDataSigning Enabled: True

Before



After



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