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TMA-ROCKY8-3.3.1.11

Ensure net.ipv4.conf.default.secure_redirects is configured

보통레벨 1자동linux

설명

Secure ICMP redirects are the same as ICMP redirects, except they come from gateways listed on the default gateway list. It is assumed that these gateways are known to your system, and that they are likely to be secure.

점검 방법

감사 방식: 셸 명령

shell
chk() { p=$1; allowed=" $2 "; case $p in net.ipv6.*) [ -d /proc/sys/net/ipv6 ] || return 0;; esac; v=$(sysctl -n "$p" 2>/dev/null) || { echo "$p: not available"; return 1; }; case "$allowed" in *" $v "*) ;; *) echo "$p is $v (running)"; return 1;; esac; sd=$(readlink -e /lib/systemd/systemd-sysctl || readlink -e /usr/lib/systemd/systemd-sysctl); f=$("$sd" --cat-config 2>/dev/null | grep -Po "^\h*${p//./\.}\h*=\h*\K\H+" | tail -n1); [ -n "$f" ] || { echo "$p is not set in any sysctl configuration file"; return 1; }; case "$allowed" in *" $f "*) ;; *) echo "$p is $f in configuration"; return 1;; esac; }; if chk net.ipv4.conf.default.secure_redirects 0; then echo compliant; fi
예상 출력
compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

1. Review all files being used by systemd sysctl and comment out or remove all net.ipv4.conf.default.secure_redirects lines that are not net.ipv4.conf.default.secure_redirects=0. Example script: #!/usr/bin/env bash { l_option="net.ipv4.conf.default.secure_redirects" l_value="0" l_grep="${l_option//./(\\.|\\/)}" a_files=() l_systemdsysctl="$(readlink -e /lib/systemd/systemd-sysctl \ || readlink -e /usr/lib/systemd/systemd-sysctl)" l_ufw_file="$([ -f /etc/default/ufw ] && \ awk -F= '/^\s*IPT_SYSCTL=/ {print $2}' /etc/default/ufw)" [ -f "$(readlink -e "$l_ufw_file")" ] && \ a_files+=("$l_ufw_file"); a_files+=("/etc/sysctl.conf") while IFS= read -r l_fname; do l_file="$(readlink -e "${l_fname//#…

속성

운영 체제
rocky-8
태그
cis-convertedkernellinuxsysctl
참고 자료
CIS Rocky Linux 8 Benchmark v3.0.0 - 3.3.1.11

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