STIGQter STIGQter: STIG Summary: Red Hat Enterprise Linux 9 Security Technical Implementation Guide Version: 2 Release: 9 Benchmark Date: 01 Jul 2026:

RHEL 9 SSH daemon must not allow Kerberos authentication.

DISA Rule

SV-258004r1045067_rule

Vulnerability Number

V-258004

Group Title

SRG-OS-000364-GPOS-00151

Rule Version

RHEL-09-255140

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure the SSH daemon to not allow Kerberos authentication.

Add the following line in "/etc/ssh/sshd_config" or to a file in "/etc/ssh/sshd_config.d", or uncomment the line and set the value to "no":

KerberosAuthentication no

The SSH service must be restarted for changes to take effect:

$ sudo systemctl restart sshd.service

Check Contents

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

$ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*kerberosauthentication'

KerberosAuthentication no

If the value is returned as "yes", the returned line is commented out, no output is returned, and the use of Kerberos authentication has not been documented with the information system security officer (ISSO), this is a finding.

Vulnerability Number

V-258004

Documentable

False

Rule Version

RHEL-09-255140

Severity Override Guidance

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

$ sudo /usr/sbin/sshd -dd 2>&1 | awk '/filename/ {print $4}' | tr -d '\r' | tr '\n' ' ' | xargs sudo grep -iH '^\s*kerberosauthentication'

KerberosAuthentication no

If the value is returned as "yes", the returned line is commented out, no output is returned, and the use of Kerberos authentication has not been documented with the information system security officer (ISSO), this is a finding.

Check Content Reference

M

Target Key

5551