STIGQter: STIG Summary: Red Hat Enterprise Linux 10 Security Technical Implementation Guide Version: 1 Release: 2 Benchmark Date: 01 Jul 2026:

RHEL 10 must be configured so that the Secure Shell (SSH) daemon does not allow Kerberos authentication.

DISA Rule

SV-281255r1184755_rule

Vulnerability Number

V-281255

Group Title

SRG-OS-000364-GPOS-00151

Rule Version

RHEL-10-700520

Severity

CAT II

CCI(s)

• CCI-001813 - Enforce access restrictions using organization-defined mechanisms.

Weight

10

Fix Recommendation

Configure RHEL 10 SSH daemons to not allow Kerberos authentication.

In "/etc/ssh/sshd_config.d", create a drop file that will lexicographically precede 50-redhat.conf and add the following line:

KerberosAuthentication no

Restart the SSH service with the following command for the changes to take effect:

$ sudo systemctl restart sshd.service

Check Contents

Verify RHEL 10 SSH daemons do 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'
/etc/ssh/sshd_config.d/10-stig.conf:KerberosAuthentication no

Verify the runtime setting with the following command:

$ sudo sshd -T | grep -i kerberosauthentication
kerberosauthentication no

If the "KerberosAuthentication" keyword is not set to "no" in a drop-in that lexicographically precedes 50-redhat.conf, no output is returned, and the use of Kerberos authentication has not been documented with the information system security officer, this is a finding.

Vulnerability Number

V-281255

Documentable

False

Rule Version

RHEL-10-700520

Severity Override Guidance

Verify RHEL 10 SSH daemons do 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'
/etc/ssh/sshd_config.d/10-stig.conf:KerberosAuthentication no

Verify the runtime setting with the following command:

$ sudo sshd -T | grep -i kerberosauthentication
kerberosauthentication no

If the "KerberosAuthentication" keyword is not set to "no" in a drop-in that lexicographically precedes 50-redhat.conf, no output is returned, and the use of Kerberos authentication has not been documented with the information system security officer, this is a finding.

Check Content Reference

M

Target Key

5733