VMware ESXi
TMA-ESXI9-5.4
Host must filter Bridge Protocol Data Unit (BPDU) packets
Descrição
To prevent cascading lockout of uplink interfaces from the ESXi host, the Net.BlockGuestBPDU parameter can be set to 1, enabling BPDU Filter to drop BPDU packets sent from virtual machines to the physical switch. This is crucial as ESXi's Standard and Distributed Virtual Switches do not support STP, making them prone to network loops if BPDUs are unfiltered. The audit reads Net.BlockGuestBPDU with esxcli and requires 1. Runs in the ESXi Shell (busybox sh) as root.
Como é verificado
Método de auditoria: Comando shell
out=$(esxcli system settings advanced list -o /Net/BlockGuestBPDU 2>/dev/null) || exit 1
v=$(printf '%s\n' "$out" | awk '$1=="Int" && $2=="Value:" {print $3; exit}')
case "$v" in ''|*[!0-9-]*) echo '/Net/BlockGuestBPDU: no integer value'; exit 1 ;; esac
if [ "$v" -eq 1 ]; then echo compliant; else echo "/Net/BlockGuestBPDU = $v (expected 1)"; fi- Saída esperada
compliant
Como é corrigido
Método de correção: Orientação ou patch de infraestrutura
From an administrative PowerCLI session: Execute - Get-VMHost | Get-AdvancedSetting -Name Net.BlockGuestBPDU | Set-AdvancedSetting - Value 1 -Confirm:$false. Validate network appliances/virtual switching workloads before enforcing this setting.
Propriedades
- Sistemas operacionais
- Qualquer
- Tags
- vmwareesxinetwork
- Referência
- CIS VMware ESXi 9.0 Benchmark v1.0.0 - 5.4 Host must filter Bridge Protocol Data Unit (BPDU) packets
Verificar este host
Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.
tmaegis scan --target vmware