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

The TOSS SSH daemon must not allow Kerberos authentication, except to fulfill documented and validated mission requirements.

DISA Rule

SV-252944r991589_rule

Vulnerability Number

V-252944

Group Title

SRG-OS-000480-GPOS-00227

Rule Version

TOSS-04-010420

Severity

CAT II

CCI(s)

• CCI-000366 - Implement the security configuration settings.

Weight

10

Fix Recommendation

Configure the SSH daemon to not allow Kerberos authentication.

Add the following line in "/etc/ssh/sshd_config" or uncomment the line and set the value to "no":

KerberosAuthentication no

The SSH daemon must be restarted for the changes to take effect. To restart the SSH daemon, run the following command:

$ sudo systemctl restart sshd.service

Check Contents

Verify the SSH daemon does not allow Kerberos authentication with the following command:

$ sudo grep -i KerberosAuthentication /etc/ssh/sshd_config

KerberosAuthentication no

If the value is returned as "yes", the returned line is commented out, no output is returned, or has not been documented with the ISSO, this is a finding.

Vulnerability Number

V-252944

Documentable

False

Rule Version

TOSS-04-010420

Severity Override Guidance

Verify the SSH daemon does not allow Kerberos authentication with the following command:

$ sudo grep -i KerberosAuthentication /etc/ssh/sshd_config

KerberosAuthentication no

If the value is returned as "yes", the returned line is commented out, no output is returned, or has not been documented with the ISSO, this is a finding.

Check Content Reference

M

Target Key

5469