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TMA-ALMA8-3.3.2.7

Ensure net.ipv6.conf.all.accept_ra is configured

MédiaNível 1Automatizadalinux

Descrição

Routers periodically multicast Router Advertisement messages to announce their availability and convey information to neighboring nodes that enable them to be automatically configured on the network. net.ipv6.conf.all.accept_ra controls accepting any IPv6 RA messages on any network device. Note: If IPv6 has been disabled, this recommendation is not applicable.

Como é verificado

Método de auditoria: Comando shell

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.ipv6.conf.all.accept_ra 0; then echo compliant; fi
Saída esperada
compliant

Como é corrigido

Método de correção: Orientação ou patch de infraestrutura

1. Review all files being used by systemd sysctl and comment out or remove all net.ipv6.conf.all.accept_ra lines that are not net.ipv6.conf.all.accept_ra=0. Example script: #!/usr/bin/env bash { l_option="net.ipv6.conf.all.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)" 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//# /}")" [ -n "$l_file" ] && ! grep…

Propriedades

Sistemas operacionais
almalinux-8
Tags
cis-convertedkernellinuxsysctl
Referência
CIS AlmaLinux OS 8 Benchmark v4.0.0 - 3.3.2.7

Verificar este host

Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.

shell
tmaegis scan --target linux