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UBTU-22-631015 Ubuntu 22.04 LTS must be configured such that Pluggable Authentication Module (PAM) prohibits the use of cached authentications after one day.

DISA STIG library V2R10
All changes in this version
first version loaded CAT III

Maps to IA-5(13) via CCI-002007

Title

Ubuntu 22.04 LTS must be configured such that Pluggable Authentication Module (PAM) prohibits the use of cached authentications after one day.

Control

Verify that PAM prohibits the use of cached authentications after one day by using the following command: Note: If smart card authentication is not being used on the system, this requirement is not applicable. $ sudo grep -i '^\s*offline_credentials_expiration' /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf /etc/sssd/sssd.conf:offline_credentials_expiration = 1 If "offline_credentials_expiration" in "/etc/sssd/sssd.conf" or in a file with a name ending in .conf in the "/etc/sssd/conf.d/" directory, is not set to "1", is commented out, is missing, or conflicting results are returned, this is a finding.

Discussion

If cached authentication information is out-of-date, the validity of the authentication information may be questionable.

Related controls

CCI-002007

Fix

Configure PAM to prohibit the use of cached authentications after one day. Add or modify the following line in the "/etc/sssd/sssd.conf" file, just below the line "[pam]": offline_credentials_expiration = 1 Note: It is valid for this configuration to be in a file with a name that ends with ".conf" and does not begin with a "." in the "/etc/sssd/conf.d/" directory instead of the "/etc/sssd/sssd.conf" file.