Ensure user namespaces are disabled

NiedrigStufe 2Automatisiertbottlerocket

Beschreibung

User namespaces should be disabled unless required. Note that user namespaces can be necessary in environments where containers running as unprivileged users are meant to run other containers. These are often referred to as "rootless" containers. The audit reads /proc/sys/user/max_user_namespaces and requires 0. Run tmaegis on the host through the admin container root shell (sudo sheltie).

So wird geprüft

Prüfmethode: Shell-Befehl

shell

bad=0
chk() { f=/proc/sys/$(printf %s "$1" | tr . /); v=$(cat "$f" 2>/dev/null) || { echo "$1: not readable"; bad=1; return; }; [ "$v" = "$2" ] || { echo "$1 = $v (expected $2)"; bad=1; }; }
chk user.max_user_namespaces 0
[ "$bad" -eq 0 ] && echo compliant

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

Run the following command to set the active kernel parameter and persist the setting: # apiclient apply <<EOF [settings.kernel.sysctl] "user.max_user_namespaces" = "0" EOF

Eigenschaften

Betriebssysteme: Beliebig
Tags: bottlerocketsystem
Referenz: CIS Bottlerocket Benchmark v1.0.0 - 1.4.4 Ensure user namespaces are disabled

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shell

tmaegis scan --target bottlerocket --level 2