Ensure IPv4 loopback traffic is configured

RendahLevel 2Otomatisbottlerocket

Deskripsi

Configure the loopback interface to accept traffic. Configure all other interfaces to deny traffic to the loopback network (127.0.0.0/8). The audit runs iptables -S and requires the INPUT lo ACCEPT, INPUT 127.0.0.0/8 DROP and OUTPUT lo ACCEPT rules (rule order is not verified). Run tmaegis on the host through the admin container root shell (sudo sheltie).

Cara pemeriksaan

Metode audit: Perintah shell

shell

in=$(iptables -S INPUT 2>/dev/null) || exit 1
out=$(iptables -S OUTPUT 2>/dev/null) || exit 1
bad=0
printf '%s\n' "$in" | grep -Eq -- '^-A INPUT -i lo( .*)? -j ACCEPT' || { echo 'missing: -A INPUT -i lo -j ACCEPT'; bad=1; }
printf '%s\n' "$in" | grep -Eq -- '^-A INPUT -s 127.0.0.0/8( .*)? -j DROP' || { echo 'missing: -A INPUT -s 127.0.0.0/8 -j DROP'; bad=1; }
printf '%s\n' "$out" | grep -Eq -- '^-A OUTPUT -o lo( .*)? -j ACCEPT' || { echo 'missing: -A OUTPUT -o lo -j ACCEPT'; bad=1; }
[ "$bad" -eq 0 ] && echo compliant

Output yang diharapkan: compliant

Cara perbaikan

Metode perbaikan: Panduan atau patch infrastruktur

Run the following commands to implement the loopback rules: # iptables -A INPUT -i lo -j ACCEPT # iptables -A OUTPUT -o lo -j ACCEPT # iptables -A INPUT -s 127.0.0.0/8 -j DROP

Properti

Sistem operasi: Apa saja
Tag: bottlerocketnetwork
Referensi: CIS Bottlerocket Benchmark v1.0.0 - 3.4.1.2 Ensure IPv4 loopback traffic is configured

Periksa host ini

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shell

tmaegis scan --target bottlerocket --level 2