Ensure that Linux kernel capabilities are restricted within containers

MediaNivel 1Automatizadadocker

Descripción

Containers should run with the minimum Linux capabilities; the benchmark specifically asks for NET_RAW to be dropped unless required. Flags containers whose CapDrop contains neither ALL nor NET_RAW (review CapAdd separately). The audit inspects every running container (docker ps -q) and prints the offending names; a host with no running containers is compliant.

Cómo se verifica

Método de auditoría: Comando de shell

shell

ids=$(docker ps -q) || exit 1; [ -z "$ids" ] && { echo compliant; exit 0; }; out=$(docker inspect --format '{{.Name}} {{range .HostConfig.CapDrop}}{{.}},{{end}}' $ids) || exit 1; bad=$(printf '%s\n' "$out" | awk 'toupper($0) !~ /(^| |,)(CAP_)?(ALL|NET_RAW),/ {print $1}'); [ -z "$bad" ] && echo compliant || printf '%s\n' "$bad"

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Run containers with --cap-drop=ALL (or at least --cap-drop=NET_RAW) and add back only required capabilities with --cap-add.

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: dockerruntime
Referencia: CIS Docker Benchmark v1.9.0 - 5.4 Ensure that Linux kernel capabilities are restricted within containers

Verificar este host

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

shell

tmaegis scan --target docker