Virtual machines must limit PCI/PCIe device passthrough functionality

MittelStufe 1Automatisiertvmware

Beschreibung

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.

So wird geprüft

Prüfmethode: Shell-Befehl

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

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

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

Eigenschaften

Betriebssysteme: Beliebig
Tags: vmwareesxivirtual-machine
Referenz: CIS VMware ESXi 9.0 Benchmark v1.0.0 - 7.7 Virtual machines must limit PCI/PCIe device passthrough functionality

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