Title

Ubuntu 24.04 LTS must use DOD PKI-established certificate authorities (CAs) for verification of the establishment of protected sessions. (Cat II impact)

Discussion

Untrusted CAs can issue certificates, but they may be issued by organizations or individuals that seek to compromise DOD systems or by organizations with insufficient security controls. If the CA used for verifying the certificate is not a DOD-approved CA, trust of this CA has not been established. The DOD will only accept PKI-certificates obtained from a DOD-approved internal or external certificate authority. Reliance on CAs for the establishment of secure sessions includes, for example, the use of SSL/TLS certificates.

Check Content

Verify the directory containing the root certificates for Ubuntu 24.04 LTS contains certificate files for DOD PKI-established CAs by iterating over all files in the "/etc/ssl/certs" directory and checking if, at least one, has the subject matching "DOD ROOT CA". $ grep -ir DOD /etc/ssl/certs DOD_PKE_CA_chain.pem If no root certificate is found, this is a finding.

Fix Text

Configure Ubuntu 24.04 LTS to use of DOD PKI-established CAs for verification of the establishment of protected sessions. Edit the "/etc/ca-certificates.conf" file, adding the character "!" to the beginning of all uncommented lines that do not start with the "!" character with the following command: $ sudo sed -i -E 's/^([^!#]+)/!\1/' /etc/ca-certificates.conf Add at least one CA to the "/usr/local/share/ca-certificates" directory in the PEM format. Update the "/etc/ssl/certs" directory with the following command: $ sudo update-ca-certificates

Additional Identifiers

Rule ID: SV-270745r1066724_rule

Vulnerability ID: V-270745

Group Title: SRG-OS-000403-GPOS-00182

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.