STIGQter STIGQter: STIG Summary: Amazon Linux 2023 Security Technical Implementation Guide Version: 1 Release: 4 Benchmark Date: 01 Jul 2026:

Amazon Linux 2023 SSH daemon must not allow Kerberos authentication.

DISA Rule

SV-274045r1120123_rule

Vulnerability Number

V-274045

Group Title

SRG-OS-000364-GPOS-00151

Rule Version

AZLX-23-001220

Severity

CAT II

CCI(s)

Weight

10

Fix Recommendation

Configure Amazon Linux 2023 so that the SSH daemon does 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 Amazon Linux 2023 is configured so that the SSH daemon does not allow Kerberos authentication with the following command:

$ [ec2-user@ip-172-31-12-63 ~]$ 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/93-KerberosAuthentication.conf: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-274045

Documentable

False

Rule Version

AZLX-23-001220

Severity Override Guidance

Verify Amazon Linux 2023 is configured so that the SSH daemon does not allow Kerberos authentication with the following command:

$ [ec2-user@ip-172-31-12-63 ~]$ 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/93-KerberosAuthentication.conf: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

5700