STIGQter: STIG Summary: Oracle Linux 9 Security Technical Implementation Guide Version: 1 Release: 6 Benchmark Date: 01 Jul 2026:

OL 9 must implement certificate status checking for multifactor authentication (MFA).

DISA Rule

SV-271608r1091536_rule

Vulnerability Number

V-271608

Group Title

SRG-OS-000375-GPOS-00160

Rule Version

OL09-00-000930

Severity

CAT II

CCI(s)

• CCI-004046 - Implement multi-factor authentication for local; network; and/or remote access to privileged accounts; and/or non-privileged accounts such that one of the factors is provided by a device separate from the system gaining access.
• CCI-001954 - Electronically verifies Personal Identity Verification-compliant credentials.

Weight

10

Fix Recommendation

Configure OL 9 to implement certificate status checking for MFA.

Review the "/etc/sssd/conf.d/certificate_verification.conf" file to determine if the system is configured to prevent OCSP or certificate verification.

Add the following line to the "/etc/sssd/conf.d/certificate_verification.conf" file:

certificate_verification = ocsp_dgst=sha512

Set the correct ownership and permissions on the "/etc/sssd/conf.d/certificate_verification.conf" file by running these commands:

$ sudo chown root:root "/etc/sssd/conf.d/certificate_verification.conf"
$ sudo chmod 600 "/etc/sssd/conf.d/certificate_verification.conf"

The "sssd" service must be restarted for the changes to take effect. To restart the "sssd" service, run the following command:

$ sudo systemctl restart sssd.service

Check Contents

Verify that OL 9 implements Online Certificate Status Protocol (OCSP) and is using the proper digest value on the system with the following command:

$ sudo grep certificate_verification /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf | grep -v "^#"
certificate_verification = ocsp_dgst=sha512

If the certificate_verification line is missing from the [sssd] section, or is missing "ocsp_dgst=sha512", ask the administrator to indicate what type of multifactor authentication is being used and how the system implements certificate status checking. If there is no evidence of certificate status checking being used, this is a finding.

Vulnerability Number

V-271608

Documentable

False

Rule Version

OL09-00-000930

Severity Override Guidance

Verify that OL 9 implements Online Certificate Status Protocol (OCSP) and is using the proper digest value on the system with the following command:

$ sudo grep certificate_verification /etc/sssd/sssd.conf /etc/sssd/conf.d/*.conf | grep -v "^#"
certificate_verification = ocsp_dgst=sha512

If the certificate_verification line is missing from the [sssd] section, or is missing "ocsp_dgst=sha512", ask the administrator to indicate what type of multifactor authentication is being used and how the system implements certificate status checking. If there is no evidence of certificate status checking being used, this is a finding.

Check Content Reference

M

Target Key

5680