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V-256393

CAT II (Medium)

The ESXi host Secure Shell (SSH) daemon must not permit tunnels.

Rule ID

SV-256393r959010_rule

STIG

VMware vSphere 7.0 ESXi Security Technical Implementation Guide

Version

V1R4

CCIs

CCI-000366

Discussion

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).

Check Content

From an ESXi shell, run the following command:

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

Expected result:

permittunnel no

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

Fix Text

From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":

PermitTunnel no