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The ESXi host Secure Shell (SSH) daemon must disable port forwarding.


Finding ID Version Rule ID IA Controls Severity
V-256434 ESXI-70-000082 SV-256434r886083_rule Medium
While enabling Transmission Control Protocol (TCP) tunnels is a valuable function of sshd, this feature is not appropriate for use on the ESXi hypervisor.
VMware vSphere 7.0 ESXi Security Technical Implementation Guide 2023-06-21


Check Text ( C-60109r886081_chk )
From an ESXi shell, run the following command:

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

Expected result:

allowtcpforwarding no

If the output does not match the expected result, this is a finding.
Fix Text (F-60052r886082_fix)
From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":

AllowTcpForwarding no