Title: The External Root CA certificates must be installed in the Trusted Root Store on unclassified systems. Description: To ensure secure websites protected with External Certificate Authority (ECA) server certificates are properly validated, the system must trust the ECA Root CAs. The ECA root certificates will ensure the trust chain is established for server certificates issued from the External CAs. This requirement only applies to unclassified systems. Check Text: Verify the ECA Root CA certificates are installed on unclassified systems as Trusted Root Certification Authorities. Run "PowerShell" as an administrator. Execute the following command: Get-ChildItem -Path Cert:Localmachine oot | Where Subject -Like "*ECA*" | FL Subject, Thumbprint, NotAfter If the following certificate "Subject" and "Thumbprint" information is not displayed, this is a finding. Subject: CN=ECA Root CA 2, OU=ECA, O=U.S. Government, C=US Thumbprint: C313F919A6ED4E0E8451AFA930FB419A20F181E4 NotAfter: 3/30/2028 Subject: CN=ECA Root CA 4, OU=ECA, O=U.S. Government, C=US Thumbprint: 73E8BB08E337D6A5A6AEF90CFFDD97D9176CB582 NotAfter: 12/30/2029 Alternately use the Certificates MMC snap-in: Run "MMC". Select "File", "Add/Remove Snap-in". Select "Certificates", click "Add". Select "Computer account", click "Next". Select "Local computer: (the computer this console is running on)", click "Finish". Click "OK". Expand "Certificates" and navigate to "Trusted Root Certification Authorities >> Certificates". For each of the ECA Root CA certificates noted below: Right-click on the certificate and select "Open". Select the "Details" Tab. Scroll to the bottom and select "Thumbprint". If the ECA Root CA certificates below are not listed or the value for the "Thumbprint" field is not as noted, this is a finding. ECA Root CA 2 Thumbprint: C313F919A6ED4E0E8451AFA930FB419A20F181E4 Valid to: Thursday, March 30, 2028 ECA Root CA 4 Thumbprint: 73E8BB08E337D6A5A6AEF90CFFDD97D9176CB582 Valid to: Sunday, December 30, 2029 Fix: Install the ECA Root CA certificates on unclassified systems. ECA Root CA 2 ECA Root CA 4 The InstallRoot tool is available on Cyber Exchange at https://cyber.mil/pki-pke/tools-configuration-files.

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Install the ECA Root CA certificates on unclassified systems. ECA Root CA 2 ECA Root CA 4 The InstallRoot tool is available on Cyber Exchange at https://cyber.mil/pki-pke/tools-configuration-files.