UBTU-22-612035 Ubuntu 22.04 LTS for PKI-based authentication, must implement a local cache of revocation data in case of the inability to access revocation information via the network.
All changes in this version
Maps to IA-5(2) via CCI-004068, CCI-001991
Title
Ubuntu 22.04 LTS for PKI-based authentication, must implement a local cache of revocation data in case of the inability to access revocation information via the network.
Control
Verify Ubuntu 22.04 LTS, for PKI-based authentication, uses local revocation data when unable to access it from the network by using the following command: Note: If smart card authentication is not being used on the system, this is not applicable. $ grep cert_policy /etc/pam_pkcs11/pam_pkcs11.conf | grep -E -- 'crl_auto|crl_offline' cert_policy = ca,signature,ocsp_on,crl_auto; If "cert_policy" is not set to include "crl_auto" or "crl_offline", is commented out, or is missing, this is a finding.
Discussion
Without configuring a local cache of revocation data, there is the potential to allow access to users who are no longer authorized (users with revoked certificates).
Related controls
CCI-001991, CCI-004068
Fix
Configure Ubuntu 22.04 LTS, for PKI-based authentication, to use local revocation data when unable to access the network to obtain it remotely. Add or update the "cert_policy" option in "/etc/pam_pkcs11/pam_pkcs11.conf" to include "crl_auto" or "crl_offline". cert_policy = ca,signature,ocsp_on, crl_auto; If the system is missing an "/etc/pam_pkcs11/" directory and an "/etc/pam_pkcs11/pam_pkcs11.conf", find an example to copy into place and modify accordingly at "/usr/share/doc/libpam-pkcs11/examples/pam_pkcs11.conf.example.gz".