The ESXi host Secure Shell (SSH) daemon must not permit tunnels.
An XCCDF Rule
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).
- ID
- SV-256393r959010_rule
- Version
- ESXI-70-000025
- Severity
- Medium
- References
- Updated
Remediation Templates
A Manual Procedure
From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":
PermitTunnel no