TMA-OCI-2.3

Ensure no network security groups allow ingress from 0.0.0.0/0 to port 22

AltaNivel 1Automatizadaoci

Descripción

Network security groups provide stateful filtering of ingress/egress network traffic to OCI resources. It is recommended that no security group allows unrestricted ingress to port 22. Removing unfettered connectivity to remote console services, such as Secure Shell (SSH), reduces a server's exposure to risk. Flags network security groups with an INGRESS rule from 0.0.0.0/0 covering port 22. Covers every subscribed region and every accessible compartment. Read-only OCI CLI calls; credentials and home region come from the CLI's normal configuration (~/.oci/config, OCI_CLI_PROFILE, OCI_CLI_AUTH). The tenancy OCID is taken from OCI_TENANCY or the first tenancy= line of the config file. A missing CLI or credential fails the check.

Cómo se verifica

Método de auditoría: Comando de shell

shell

t=${OCI_TENANCY:-$(sed -n 's/^[[:space:]]*tenancy[[:space:]]*=[[:space:]]*//p' "${OCI_CLI_CONFIG_FILE:-$HOME/.oci/config}" 2>/dev/null | head -n 1 | tr -d '\r[:space:]')}
[ -n "$t" ] || exit 1
bad=0
cs=$(oci iam compartment list --compartment-id "$t" --compartment-id-in-subtree true --access-level ACCESSIBLE --all --query 'data[?"lifecycle-state"==`"ACTIVE"`].id' --raw-output 2>/dev/null) || exit 1
comps="$t $(printf '%s\n' "$cs" | grep -o 'ocid1\.compartment\.[^"]*')"
rs=$(oci iam region-subscription list --tenancy-id "$t" --query 'data[?status==`"READY"`]."region-name"' --raw-output 2>/dev/null) || exit 1
regions=$(printf '%s\n' "$rs" | grep -o '"[a-z0-9-]*"' | tr -d '"')
[ -n "$regions" ] || exit 1
for r in $regions; do
  for c in $comps; do
    ns=$(oci network nsg list --compartment-id "$c" --region "$r" --all --query 'data[?"lifecycle-state"==`"AVAILABLE"`].id' --raw-output 2>/dev/null) || exit 1
    for g in $(printf '%s\n' "$ns" | grep -o 'ocid1\.networksecuritygroup\.[^"]*'); do
      n=$(oci network nsg rules list --nsg-id "$g" --region "$r" --all --query 'length(data[?direction==`"INGRESS"` && (source==`"0.0.0.0/0"`) && (protocol==`"all"` || (protocol==`"6"` && ("tcp-options"."destination-port-range"==`null` || ("tcp-options"."destination-port-range".min<=`22` && "tcp-options"."destination-port-range".max>=`22`))) || (protocol==`"17"` && ("udp-options"."destination-port-range"==`null` || ("udp-options"."destination-port-range".min<=`22` && "udp-options"."destination-port-range".max>=`22`))))])' --raw-output 2>/dev/null) || exit 1
      [ "${n:-0}" -eq 0 ] || { echo "port 22 open to 0.0.0.0/0: $r $g"; bad=1; }
    done
  done
done
[ "$bad" -eq 0 ] && echo compliant

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Remove or narrow the offending NSG rules (oci network nsg rules remove / update --nsg-id <ocid> ...) so 0.0.0.0/0 cannot reach port 22.

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: ocinetwork
Referencia: CIS Oracle Cloud Infrastructure Foundations Benchmark v3.1.1 - 2.3 Ensure no network security groups allow ingress from 0.0.0.0/0 to port 22

Verificar este host

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

shell

tmaegis scan --target oci