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The Photon operating system must configure Secure Shell (SSH) to restrict AllowTcpForwarding.


Finding ID Version Rule ID IA Controls Severity
V-258883 PHTN-40-000220 SV-258883r933710_rule Medium
While enabling TCP tunnels is a valuable function of sshd, this feature is not appropriate for use on single purpose appliances.
VMware vSphere 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide 2023-10-29


Check Text ( C-62623r933708_chk )
At the command line, run the following command to verify the running configuration of sshd:

# sshd -T|&grep -i AllowTcpForwarding

Example result:

allowtcpforwarding no

If "AllowTcpForwarding" is not set to "no", this is a finding.
Fix Text (F-62532r933709_fix)
Navigate to and open:


Ensure the "AllowTcpForwarding" line is uncommented and set to the following:

AllowTcpForwarding no

At the command line, run the following command:

# systemctl restart sshd.service