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The ESXi host SSH daemon must not permit tunnels.


Overview

Finding ID Version Rule ID IA Controls Severity
V-239280 ESXI-67-000025 SV-239280r674769_rule Medium
Description
OpenSSH has the ability to create network tunnels (layer 2 and layer 3) over an SSH connection. This function can provide similar convenience to a Virtual Private Network (VPN) with the similar risk of providing a path to circumvent firewalls and network Access Control Lists (ACLs).
STIG Date
VMware vSphere 6.7 ESXi Security Technical Implementation Guide 2022-01-05

Details

Check Text ( C-42513r674767_chk )
From an SSH session connected to the ESXi host, or from the ESXi shell, run the following command:

# grep -i "^PermitTunnel" /etc/ssh/sshd_config

If there is no output or the output is not exactly "PermitTunnel no", this is a finding.
Fix Text (F-42472r674768_fix)
From an SSH session connected to the ESXi host, or from the ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":

PermitTunnel no