STIGQter: STIG Summary: Tri-Lab Operating System Stack (TOSS) 4 Security Technical Implementation Guide Version: 2 Release: 6 Benchmark Date: 01 Jul 2026:

TOSS must use multifactor authentication for network and local access to privileged and nonprivileged accounts.

DISA Rule

SV-252952r1016305_rule

Vulnerability Number

V-252952

Group Title

SRG-OS-000105-GPOS-00052

Rule Version

TOSS-04-020070

Severity

CAT II

CCI(s)

CCI-000765 - Implement multifactor authentication for network access to privileged accounts.
CCI-000766 - Implement multifactor authentication for network access to non-privileged accounts.
CCI-004047 - Implement multi-factor authentication for local; network; and/or remote access to privileged accounts; and/or non-privileged accounts such that the device meets organization-defined strength of mechanism requirements.

Weight

Fix Recommendation

Configure the operating system to use multifactor authentication for network access to privileged accounts.

One possible method for meeting this requirement is to require smart card logon for access to interactive accounts; in which case, configure TOSS to use multifactor authentication for local access to accounts.

Add or update the "pam_cert_auth" setting in the "/etc/sssd/sssd.conf" file to match the following line:

[pam]
pam_cert_auth = True

Add or update "pam_sss.so" with "try_cert_auth" or "require_cert_auth" in the "/etc/pam.d/system-auth" and "/etc/pam.d/smartcard-auth" files based on the following examples:

/etc/pam.d/smartcard-auth:auth sufficient pam_sss.so try_cert_auth

/etc/pam.d/system-auth:auth [success=done authinfo_unavail=ignore ignore=ignore default=die] pam_sss.so try_cert_auth

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 the operating system uses multifactor authentication for network access to privileged accounts. If it does not, this is a finding.

Note: This requirement is applicable to any externally accessible nodes of the TOSS system. For compute or other intra-cluster only accessible nodes, this requirement is Not Applicable.

One possible method for meeting this requirement is to require smart card logon for access to interactive accounts.

Check that the "pam_cert_auth" setting is set to "true" in the "/etc/sssd/sssd.conf" file.

Check that the "try_cert_auth" or "require_cert_auth" options are configured in both "/etc/pam.d/system-auth" and "/etc/pam.d/smartcard-auth" files with the following command:

$ sudo grep cert_auth /etc/sssd/sssd.conf /etc/pam.d/*

/etc/sssd/sssd.conf:pam_cert_auth = True
/etc/pam.d/smartcard-auth:auth sufficient pam_sss.so try_cert_auth
/etc/pam.d/system-auth:auth [success=done authinfo_unavail=ignore ignore=ignore default=die] pam_sss.so try_cert_auth

If "pam_cert_auth" is not set to "true" in "/etc/sssd/sssd.conf", this is a finding.

If "pam_sss.so" is not set to "try_cert_auth" or "require_cert_auth" in both the "/etc/pam.d/smartcard-auth" and "/etc/pam.d/system-auth" files, this is a finding.

Vulnerability Number

V-252952

Documentable

False

Rule Version

TOSS-04-020070

Severity Override Guidance

Check Content Reference

Target Key

5469