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


Finding ID Version Rule ID IA Controls Severity
V-239158 PHTN-67-000087 SV-239158r675282_rule Medium
If Kerberos is enabled through 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.
VMware vSphere 6.7 Photon OS Security Technical Implementation Guide 2022-06-17


Check Text ( C-42369r675280_chk )
At the command line, execute 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 (F-42328r675281_fix)
Open /etc/ssh/sshd_config with a text editor.

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

KerberosAuthentication no

At the command line, execute the following command:

# service sshd reload