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V-256551

CAT II (Medium)

The Photon operating system must configure sshd to disallow Kerberos authentication.

Rule ID

SV-256551r991589_rule

STIG

VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide

Version

V1R4

CCIs

CCI-000366

Discussion

If Kerberos is enabled through Secure Shell (SSH), sshd provides a means of access to the system's Kerberos implementation. Vulnerabilities in the system's Kerberos implementation may then be subject to exploitation. To reduce the attack surface of the system, the Kerberos authentication mechanism within SSH must be disabled.

Check Content

At the command line, run the following command:

# sshd -T|&grep -i KerberosAuthentication

Expected result:

KerberosAuthentication no

If the output does not match the expected result, this is a finding.

Fix Text

Navigate to and open:

/etc/ssh/sshd_config

Ensure the "KerberosAuthentication" line is uncommented and set to the following:

KerberosAuthentication no

At the command line, run the following command:

# systemctl restart sshd.service