The ESXi host Secure Shell (SSH) daemon must be configured to not allow gateway ports.
An XCCDF Rule
Description
<VulnDiscussion>SSH Transmission Control Protocol (TCP) connection forwarding provides a mechanism to establish TCP connections proxied by the SSH server. This function can provide convenience similar to a virtual private network (VPN) with the similar risk of providing a path to circumvent firewalls and network Access Control Lists (ACLs). Gateway ports allow remote forwarded ports to bind to nonloopback addresses on the server.</VulnDiscussion><FalsePositives></FalsePositives><FalseNegatives></FalseNegatives><Documentable>false</Documentable><Mitigations></Mitigations><SeverityOverrideGuidance></SeverityOverrideGuidance><PotentialImpacts></PotentialImpacts><ThirdPartyTools></ThirdPartyTools><MitigationControl></MitigationControl><Responsibility></Responsibility><IAControls></IAControls>
- ID
- SV-256391r885954_rule
- Severity
- Low
- References
- Updated
Remediation - Manual Procedure
From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":
GatewayPorts no