Linux distributions
TMA-ROCKY9-3.3.1.19
Ensure net.ipv4.conf.all.route_localnet is configured
Descrição
The net.ipv4.conf.all.route_localnet flag enables the use of 127/8 for local routing purposes and tells the system do not consider loopback addresses as martian source or destination while routing. More information about the kernel parameter configuration files, their location, and load preference is available in the "Configure Network Kernel Parameters" section overview.
Como é verificado
Método de auditoria: Comando 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 $f in configuration"; return 1;; esac; }; if chk net.ipv4.conf.all.route_localnet 0; then echo compliant; fi- Saída esperada
compliant
Como é corrigido
Método de correção: Orientação ou patch de infraestrutura
Review all files being used by systemd sysctl and comment out or remove all net.ipv4.conf.all.route_localnet lines that are not net.ipv4.conf.all.route_localnet = 0. Example script #!/usr/bin/env bash { l_option="net.ipv4.conf.all.route_localnet" l_value="0" l_grep="${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*\/[^…
Propriedades
- Sistemas operacionais
- rocky-9
- Tags
- cis-convertedkernellinuxsysctl
- Referência
- CIS Rocky Linux 9 Benchmark v3.0.0 - 3.3.1.19
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Execute isto em uma máquina que você tenha permissão para auditar. A varredura é somente leitura.
tmaegis scan --target linux