TMA-OCI-2.4

Ensure no network security groups allow ingress from 0.0.0.0/0 to port 3389

AltaNível 1Automatizadaoci

Descrição

Network security groups provide stateful filtering of ingress/egress network traffic to OCI resources. It is recommended that no security group allows unrestricted ingress access to port 3389. Removing unfettered connectivity to remote console services, such as Remote Desktop Protocol (RDP), reduces a server's exposure to risk. Flags network security groups with an INGRESS rule from 0.0.0.0/0 covering port 3389. 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.

Como é verificado

Método de auditoria: Comando 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 "$r" --all --query 'length(data[?direction==`"INGRESS"` && (source==`"0.0.0.0/0"`) && (protocol==`"all"` || (protocol==`"6"` && ("tcp-options"."destination-port-range"==`null` || ("tcp-options"."destination-port-range".min<=`3389` && "tcp-options"."destination-port-range".max>=`3389`))) || (protocol==`"17"` && ("udp-options"."destination-port-range"==`null` || ("udp-options"."destination-port-range".min<=`3389` && "udp-options"."destination-port-range".max>=`3389`))))])' --raw-output 2>/dev/null) || exit 1
      [ "${n:-0}" -eq 0 ] || { echo "port 3389 open to 0.0.0.0/0: $r $g"; bad=1; }
    done
  done
done
[ "$bad" -eq 0 ] && echo compliant

Saída esperada: compliant

Como é corrigido

Método de correção: Orientação ou patch de infraestrutura

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 3389.

Propriedades

Sistemas operacionais: Qualquer
Tags: ocinetwork
Referência: CIS Oracle Cloud Infrastructure Foundations Benchmark v3.1.1 - 2.4 Ensure no network security groups allow ingress from 0.0.0.0/0 to port 3389

Verificar este host

Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.

shell

tmaegis scan --target oci