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The ESXi host Secure Shell (SSH) daemon must not allow host-based authentication.


Overview

Finding ID Version Rule ID IA Controls Severity
V-256386 ESXI-70-000013 SV-256386r885939_rule Medium
Description
SSH trust relationships mean a compromise on one host can allow an attacker to move trivially to other hosts. SSH's cryptographic host-based authentication is more secure than ".rhosts" authentication because hosts are cryptographically authenticated. However, it is not recommended that hosts unilaterally trust one another, even within an organization.
STIG Date
VMware vSphere 7.0 ESXi Security Technical Implementation Guide 2023-06-21

Details

Check Text ( C-60061r885937_chk )
From an ESXi shell, run the following command:

# /usr/lib/vmware/openssh/bin/sshd -T|grep hostbasedauthentication

Expected result:

hostbasedauthentication no

If the output does not match the expected result, this is a finding.
Fix Text (F-60004r885938_fix)
From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":

HostbasedAuthentication no