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TMA-ROCKY9-3.3.2.6

Ensure net.ipv6.conf.default.accept_source_route is configured

MédiaNível 1Automatizadalinux

Descrição

The accept_source_route option causes network interfaces to accept packets with the Strict Source Route (SSR) or Loose Source Routing (LSR) option set. net.ipv6.conf.default.accept_source_route controls accepting of all IPv6 packets with the SSR or LSR option set on newly added network interfaces. In networking, source routing allows a sender to partially or fully specify the route packets take through a network. In contrast, non-source routed packets travel a path determined by routers in the network. In some cases, systems may not be routable or reachable from some locations (e.g. private ad

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.default.accept_source_route 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.default.accept_source_route lines that are not net.ipv6.conf.default.accept_source_route=0. Example script: #!/usr/bin/env bash { l_option="net.ipv6.conf.default.accept_source_route" 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 | …

Propriedades

Sistemas operacionais
rocky-9
Tags
cis-convertedkernellinuxsysctl
Referência
CIS Rocky Linux 9 Benchmark v3.0.0 - 3.3.2.6

Verificar este host

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

shell
tmaegis scan --target linux