Ensure that Docker's default bridge "docker0" is not used

NiedrigStufe 2Automatisiertdocker

Beschreibung

Containers on the default bridge (docker0) can reach each other without restriction and are exposed to ARP spoofing; user-defined networks should be used. Flags containers attached to the network named bridge. The audit inspects every running container (docker ps -q) and prints the offending names; a host with no running containers is compliant.

So wird geprüft

Prüfmethode: Shell-Befehl

shell

ids=$(docker ps -q) || exit 1; [ -z "$ids" ] && { echo compliant; exit 0; }; out=$(docker inspect --format '{{.Name}}{{range $n, $_ := .NetworkSettings.Networks}} {{$n}}{{end}}' $ids) || exit 1; bad=$(printf '%s\n' "$out" | awk '{for(i=2;i<=NF;i++) if($i=="bridge") {print $1; break}}'); [ -z "$bad" ] && echo compliant || printf '%s\n' "$bad"

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Create user-defined networks (docker network create ...) and attach containers to them instead of the default bridge.

Eigenschaften

Betriebssysteme: Beliebig
Tags: dockerruntimenetwork
Referenz: CIS Docker Benchmark v1.9.0 - 5.30 Ensure that Docker's default bridge "docker0" is not used

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shell

tmaegis scan --target docker --level 2