The ESXi host must configure the firewall to block network traffic by default.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-258769 | SRG-OS-000480-VMM-002000 | ESXI-80-000214 | SV-258769r933368_rule | 2023-10-11 | 1 |
| Description |
|---|
| In addition to service-specific firewall rules, ESXi has a default firewall rule policy to allow or deny incoming and outgoing traffic. Reduce the risk of attack by ensuring this is set to deny incoming and outgoing traffic. |
| ℹ️ Check |
|---|
| From an ESXi shell, run the following command: # esxcli network firewall get If the "Default Action" does not equal "DROP", this is a finding. If "Enabled" does not equal "true", this is a finding. or From a PowerCLI command prompt while connected to the ESXi host, run the following command: Get-VMHostFirewallDefaultPolicy If the Incoming or Outgoing policies are "True", this is a finding. |
| ✔️ Fix |
|---|
| From an ESXi shell, run the following command: # esxcli network firewall set --default-action=false or From a PowerCLI command prompt while connected to the ESXi host, run the following command: Get-VMHostFirewallDefaultPolicy | Set-VMHostFirewallDefaultPolicy -AllowIncoming $false -AllowOutgoing $false |