The ESXi host Secure Shell (SSH) daemon must disable port forwarding.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-256434 | SRG-OS-000480-VMM-002000 | ESXI-70-000082 | SV-256434r959010_rule | 2025-02-11 | 1 |
Description
While enabling Transmission Control Protocol (TCP) tunnels is a valuable function of sshd, this feature is not appropriate for use on the ESXi hypervisor.
ℹ️ Check
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
From an ESXi shell, add or correct the following line in "/etc/ssh/sshd_config":
AllowTcpForwarding no