Ensure default deny firewall policy

SedangLevel 1Otomatislinux

Deskripsi

A default deny all policy on connections ensures that any unconfigured network usage will be rejected.

Cara pemeriksaan

Metode audit: Perintah shell

shell

alt0() { command -v iptables >/dev/null 2>&1 || { echo "step1: iptables not installed"; return 1; }; o=$(bash -c 'iptables -L Chain INPUT (policy DROP)' 2>&1); printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'Chain FORWARD (policy DROP)' || { echo step1: missing 'Chain FORWARD (policy DROP)'; return 1; }; printf '%s\n' "$o" | tr -s ' \t' '  ' | sed 's/^ //;s/ $//' | grep -Fxq -- 'Chain OUTPUT (policy DROP)' || { echo step1: missing 'Chain OUTPUT (policy DROP)'; return 1; }; }; if alt0; then echo compliant; fi

Output yang diharapkan: compliant

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

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

Properti

Sistem operasi: alinux-2
Tag: cis-convertedlinux
Referensi: CIS Aliyun Linux 2 Benchmark v1.0.0 ARCHIVE - 3.5.1.1

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shell

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