Linux distributions
TMA-ROCKY9-3.3.2.8
Ensure net.ipv6.conf.default.accept_ra is configured
説明
Routers periodically Multicast Router Advertisement (RA) messages to announce their availability and convey information to neighboring nodes that enable them to be automatically configured on the network. net.ipv6.conf.default.accept_ra controls accepting IPv6 RA messages on newly added network devices. More information about the kernel parameter configuration files, their location, and load preference is available in the "Configure Network Kernel Parameters" section overview. Note: If IPv6 has been disabled, this recommendation is not applicable.
チェック方法
監査方法: シェルコマンド
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 $f in configuration"; return 1;; esac; }; if chk net.ipv6.conf.default.accept_ra 0; then echo compliant; fi- 期待される出力
compliant
修正方法
修正方法: ガイダンスまたは IaC パッチ
1. Review all files being used by systemd sysctl and comment out or remove all net.ipv6.conf.default.accept_ra lines that are not net.ipv6.conf.default.accept_ra=0. Example script: #!/usr/bin/env bash { l_option="net.ipv6.conf.default.accept_ra" l_value="0" l_grep="${l_option//./(\\.|\\/)}" a_files=() l_systemdsysctl="$(readlink -e /lib/systemd/systemd-sysctl \ || readlink -e /usr/lib/systemd/systemd-sysctl)" a_files+=("/etc/sysctl.conf") while IFS= read -r l_fname; do l_file="$(readlink -e "${l_fname//# /}")" [ -n "$l_file" ] && ! grep -Psiq -- '(^|\h+)'"$l_file"'\b' \ <<< "${a_files[*]}" && a_files+=("$l_file") done < <("$l_systemdsysctl" --cat-config | tac | \ grep -Psio -- '^\h*#\h*\/[^#…
プロパティ
- オペレーティングシステム
- rocky-9
- タグ
- cis-convertedkernellinuxsysctl
- 参照
- CIS Rocky Linux 9 Benchmark v3.0.0 - 3.3.2.8
このホストをチェック
監査が許可されているマシンで実行してください。スキャンは読み取り専用です。
tmaegis scan --target linux