Ensure IPv4 default deny firewall policy

NiskaNivo 2Automatskabottlerocket

Opis

A default deny all policy on connections ensures that any unconfigured network usage will be rejected. The audit runs iptables -L -n and requires DROP or REJECT policy on INPUT, FORWARD and OUTPUT. Run tmaegis on the host through the admin container root shell (sudo sheltie).

Kako se proverava

Metod provere: Komanda ljuske

shell

out=$(iptables -L -n 2>/dev/null) || exit 1
bad=0
for c in INPUT FORWARD OUTPUT; do
  p=$(printf '%s\n' "$out" | sed -n "s/^Chain $c (policy \([A-Z]*\).*/\1/p")
  case "$p" in DROP|REJECT) ;; *) echo "$c policy ${p:-unknown}"; bad=1 ;; esac
done
[ "$bad" -eq 0 ] && echo compliant

Očekivani izlaz: compliant

Kako se ispravlja

Metod ispravke: Smernica ili zakrpa infrastrukture

Run the following commands to implement a default DROP policy: # iptables -P INPUT DROP # iptables -P OUTPUT DROP # iptables -P FORWARD DROP

Svojstva

Operativni sistemi: Bilo koji
Oznake: bottlerocketnetwork
Referenca: CIS Bottlerocket Benchmark v1.0.0 - 3.4.1.1 Ensure IPv4 default deny firewall policy

Proverite ovaj računar

Pokrenite ovo na računaru za koji imate dozvolu za proveru. Skeniranje radi u režimu samo za čitanje.

shell

tmaegis scan --target bottlerocket --level 2