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UBTU-24-400380 Ubuntu 24.04 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.

DISA STIG library V1R7
All changes in this version
first version loaded CAT II

Maps to IA-5(2) via CCI-004068

Title

Ubuntu 24.04 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

Note: If smart card authentication is not being used on the system, this is not applicable. Verify Ubuntu 24.04 LTS, for PKI-based authentication, uses local revocation data when unable to access it from the network with the following command: $ 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", 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-004068

Fix

Configure Ubuntu 24.04 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".