Host should reject MAC address changes on standard virtual switches and port groups

MediaNivel 1Automatizadavmware

Descripción

Enforcing MAC address stability on standard virtual switches and port groups prevents MAC impersonation by disallowing changes to the MAC address by virtual machines. This mitigates the risk of malicious activities initiated by impersonating authorized network adapters. The audit runs esxcli network vswitch standard (portgroup) policy security get for every standard vSwitch and port group and requires "Allow MAC Address Change: false". Runs in the ESXi Shell (busybox sh) as root.

Cómo se verifica

Método de auditoría: Comando de shell

shell

command -v esxcli >/dev/null 2>&1 || exit 1
vs=$(esxcli network vswitch standard list 2>/dev/null | sed -n 's/^ *Name: *//p') || exit 1
pgs=$(esxcli --formatter=csv network vswitch standard portgroup list 2>/dev/null | awk -F, 'NR==1 {for (i = 1; i <= NF; i++) if ($i == "Name") c = i; next} c {print $c}') || exit 1
out=$(for v in $vs; do
  x=$(esxcli network vswitch standard policy security get -v "$v" 2>/dev/null | sed -n 's/^ *Allow MAC Address Change: *//p' | head -n 1)
  [ "$x" = false ] || echo "vSwitch $v: Allow MAC Address Change=${x:-unknown}"
done
printf '%s\n' "$pgs" | while IFS= read -r p; do [ -n "$p" ] || continue
  x=$(esxcli network vswitch standard portgroup policy security get -p "$p" 2>/dev/null | sed -n 's/^ *Allow MAC Address Change: *//p' | head -n 1)
  [ "$x" = false ] || echo "portgroup $p: Allow MAC Address Change=${x:-unknown}"
done)
[ -z "$out" ] && echo compliant || printf '%s\n' "$out"

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

To set the policy to reject, perform the following: 1. From the vSphere Web Client, select the host. 2. Click Configure then expand Networking. 3. Select Virtual switches then click Edit. 4. Click on Security. 5. Set MAC address changes to Reject in the dropdown. 6. Click on OK. Alternately, perform the following using the ESXi shell: # esxcli network vswitch standard policy security set -v vSwitch2 -m false

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: vmwareesxinetwork
Referencia: CIS VMware ESXi 9.0 Benchmark v1.0.0 - 5.7 Host should reject MAC address changes on standard virtual switches and port groups

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target vmware