Information
Only DoD-approved external PKIs have been evaluated to ensure security controls and identity vetting procedures are in place that are sufficient for DoD systems to rely on the identity asserted in the certificate. PKIs lacking sufficient security controls and identity vetting procedures risk being compromised and issuing certificates that enable adversaries to impersonate legitimate users.
The authoritative list of DoD-approved PKIs is published at https://cyber.mil/pki-pke/interoperability
This requirement focuses on communications protection for PostgreSQL session rather than for the network packet.
NOTE: Nessus has provided the target output to assist in reviewing the benchmark to ensure target compliance.
Solution
Revoke trust in any certificates not issued by a DoD-approved certificate authority.
Configure PostgreSQL to accept only DoD and DoD-approved PKI end-entity certificates.
To configure PostgreSQL to accept approved CAs, see the official PostgreSQL documentation: http://www.postgresql.org/docs/current/static/ssl-tcp.html
For more information on configuring PostgreSQL to use SSL, see supplementary content APPENDIX-G.