Details

If cached authentication information is out-of-date, the validity of the authentication information may be questionable.

Solution

Configure Pluggable Authentication Module (PAM) to prohibit the use of cached authentications after one day. Add or change the following line in ‘/etc/sssd/sssd.conf’ 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.

Supportive Information

The following resource is also helpful.

• https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_CAN_Ubuntu_18-04_LTS_V2R4_STIG.zip

This security hardening control applies to the following category of controls within NIST 800-53: Identification and Authentication.This control applies to the following type of system Unix.

References

• 800-53|IA-5(13)
• CAT|III
• CCI|CCI-002007
• Rule-ID|SV-219163r610963_rule
• STIG-ID|UBTU-18-010030
• STIG-Legacy|SV-109657
• STIG-Legacy|V-100553
• Vuln-ID|V-219163

Source

• Tenable.com/audits