Amazon Linux 2023 must prohibit the use of cached authenticators after one day.

Severity	Group ID	Group Title	Version	Rule ID	Date	STIG Version
medium	V-274062	SRG-OS-000383-GPOS-00166	AZLX-23-001305	SV-274062r1120174_rule	2025-11-20	1

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If cached authentication information is out-of-date, the validity of the authentication information may be questionable.

ℹ️ Check
Verify Amazon Linux 2023 is configured so that the System Security Services Daemon (SSSD) prohibits the use of cached authentications after one day. Note: Cached authentication settings should be configured even if smart card authentication is not used on the system. Check that SSSD allows cached authentications with the following command: $ sudo grep -ir cache_credentials /etc/sssd/sssd.conf /etc/sssd/conf.d/ /etc/sssd/sssd.conf:cache_credentials = true If "cache_credentials" is set to "false" or missing from the configuration file, this is not a finding and no further checks are required. If "cache_credentials" is set to "true", check that SSSD prohibits the use of cached authentications after one day with the following command: $ sudo grep -ir offline_credentials_expiration /etc/sssd/sssd.conf /etc/sssd/conf.d/ /etc/sssd/sssd.conf:offline_credentials_expiration = 1 If "offline_credentials_expiration" is not set to a value of "1", this is a finding.

ℹ️ Check

Verify Amazon Linux 2023 is configured so that the System Security Services Daemon (SSSD) prohibits the use of cached authentications after one day. Note: Cached authentication settings should be configured even if smart card authentication is not used on the system. Check that SSSD allows cached authentications with the following command: $ sudo grep -ir cache_credentials /etc/sssd/sssd.conf /etc/sssd/conf.d/ /etc/sssd/sssd.conf:cache_credentials = true If "cache_credentials" is set to "false" or missing from the configuration file, this is not a finding and no further checks are required. If "cache_credentials" is set to "true", check that SSSD prohibits the use of cached authentications after one day with the following command: $ sudo grep -ir offline_credentials_expiration /etc/sssd/sssd.conf /etc/sssd/conf.d/ /etc/sssd/sssd.conf:offline_credentials_expiration = 1 If "offline_credentials_expiration" is not set to a value of "1", this is a finding.

✔️ Fix
Configure Amazon Linux 2023 SSSD service 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