Virtual machines must limit PCI/PCIe device passthrough functionality

MediaNivel 1Automatizadavmware

Descripción

DirectPath I/O features provide virtual machines the ability to directly access system hardware, which while advantageous for performance, can impact risk mitigation tools like vMotion, DRS, and High Availability. It also opens up a potential attack vector for privileged hardware access. Expected: no pciPassthruN.present = "TRUE". The audit parses every .vmx file under /vmfs/volumes/ on the host and lists the VMs that do not comply; it passes when none are found (or no VMs exist). Runs in the ESXi Shell (busybox sh) as root.

Cómo se verifica

Método de auditoría: Comando de shell

shell

command -v find >/dev/null 2>&1 || exit 1
out=$(find /vmfs/volumes/ -maxdepth 3 -type f -name '*.vmx' 2>/dev/null | while IFS= read -r f; do
  awk -v KEYRE='^pcipassthru[0-9]+[.]present$' -v MODE='not' -v VAL='TRUE' 'BEGIN { re = tolower(KEYRE) }
{ line = $0; sub(/^[ \t]+/, "", line); i = index(line, "="); if (i == 0) next
  k = tolower(substr(line, 1, i - 1)); sub(/[ \t]+$/, "", k)
  v = substr(line, i + 1); sub(/^[ \t]*"?/, "", v); sub(/"?[ \t\r]*$/, "", v); v = tolower(v)
  if (k ~ re) { seen = 1; if (MODE == "not" && v == tolower(VAL)) bad = bad " " k "=" v
                else if (MODE != "not" && MODE != "ge" && v != tolower(VAL)) bad = bad " " k "=" v
                else if (MODE == "ge" && (v + 0) < (VAL + 0)) bad = bad " " k "=" v } }
END { if ((MODE == "eq" || MODE == "ge") && !seen) bad = " " KEYRE " not set"
      if (bad != "") print FILENAME ":" bad }' "$f"
done)
[ -z "$out" ] && echo compliant || printf '%s\n' "$out" | head -n 25

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

The following PowerCLI command can be used: # Add the setting to all VMs Get-VM | New-AdvancedSetting -Name "pciPassthru*.present" -value "false"

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: vmwareesxivirtual-machine
Referencia: CIS VMware ESXi 9.0 Benchmark v1.0.0 - 7.7 Virtual machines must limit PCI/PCIe device passthrough functionality

Verificar este host

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

shell

tmaegis scan --target vmware