Vulnerability Discussion

To ensure users do not experience denial of service when performing certificate-based authentication to DOD websites due to the system chaining to a root other than DOD Root CAs, the US DOD CCEB Interoperability Root CA cross-certificates must be installed in the Untrusted Certificate Store. This requirement only applies to unclassified systems.

Satisfies: SRG-OS-000066-GPOS-00034, SRG-OS-000403-GPOS-00182

Check

This is applicable to unclassified systems. It is not applicable for others.

Open PowerShell as an administrator.

Execute the following command:

Get-ChildItem -Path Cert:Localmachine\disallowed | Where Issuer -Like "*CCEB Interoperability*" | FL Subject, Issuer, Thumbprint, NotAfter

If the following certificate "Subject", "Issuer", and "Thumbprint" information is not displayed, this is a finding.

Subject: CN=DOD Root CA 3, OU=PKI, OU=DOD, O=U.S. Government, C=US
Issuer: CN=US DOD CCEB Interoperability Root CA 2, OU=PKI, OU=DOD, O=U.S. Government, C=US
Thumbprint: AF132AC65DE86FC4FB3FE51FD637EBA0FF0B12A9
NotAfter: 8/26/2025 9:07:50 AM

Subject: CN=DOD Root CA 3, OU=PKI, OU=DOD, O=U.S. Government, C=US
Issuer: CN=US DOD CCEB Interoperability Root CA 2, OU=PKI, OU=DOD, O=U.S. Government, C=US
Thumbprint: 929BF3196896994C0A201DF4A5B71F603FEFBF2E
NotAfter: 9/27/2025

Alternately, use the Certificates MMC snap-in:

Run "MMC".

Select "File", "Add/Remove Snap-in".

Select "Certificates" and click "Add".

Select "Computer account" and click "Next".

Select "Local computer: (the computer this console is running on)" and click "Finish".

Click "OK".

Expand "Certificates" and navigate to Untrusted Certificates >> Certificates.

For each certificate with "US DOD CCEB Interoperability Root CA ..." under "Issued By":

Right-click the certificate and select "Open".

Select the "Details" tab.

Scroll to the bottom and select "Thumbprint".

If the certificate below is not listed or the value for the "Thumbprint" field is not as noted, this is a finding:

Issued To: DOD Root CA 3
Issued By: US DOD CCEB Interoperability Root CA 2
Thumbprint: AF132AC65DE86FC4FB3FE51FD637EBA0FF0B12A9
Valid to: Friday, August 26, 2025

Issued To: DOD Root CA 3
Issued By: US DOD CCEB Interoperability Root CA 2
Thumbprint: 929BF3196896994C0A201DF4A5B71F603FEFBF2E
Valid: Friday, September 27, 2025

Fix

Install the US DOD CCEB Interoperability Root CA cross-certificate on unclassified systems.

Issued To - Issued By - Thumbprint

DOD Root CA 3 - US DOD CCEB Interoperability Root CA 2 - AF132AC65DE86FC4FB3FE51FD637EBA0FF0B12A9

DOD Root CA 3 - US DOD CCEB Interoperability Root CA 2 - 929BF3196896994C0A201DF4A5B71F603FEFBF2E

Administrators must run the Federal Bridge Certification Authority (FBCA) Cross-Certificate Removal Tool once as an administrator and once as the current user.

The FBCA Cross-Certificate Remover Tool and User Guide are available on Cyber Exchange at https://cyber.mil/pki-pke/tools-configuration-files.