Ensure secure ICMP redirects are not accepted

BajaNivel 2Automatizadabottlerocket

Descripción

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. The audit reads the running values from /proc/sys. Run tmaegis on the host through the admin container root shell (sudo sheltie).

Cómo se verifica

Método de auditoría: Comando de shell

shell

bad=0
chk() { f=/proc/sys/$(printf %s "$1" | tr . /); v=$(cat "$f" 2>/dev/null) || { echo "$1: not readable"; bad=1; return; }; [ "$v" = "$2" ] || { echo "$1 = $v (expected $2)"; bad=1; }; }
chk net.ipv4.conf.all.secure_redirects 0
chk net.ipv4.conf.default.secure_redirects 0
[ "$bad" -eq 0 ] && echo compliant

Salida esperada: compliant

Cómo se corrige

Método de corrección: Guía o parche de infraestructura

Run the following command to set the active kernel parameters and persist the settings: # apiclient apply <<EOF [settings.kernel.sysctl] "net.ipv4.conf.all.secure_redirects" = "0" "net.ipv4.conf.default.secure_redirects" = "0" EOF Run the following command to flush the routing cache: # sysctl -w net.ipv4.route.flush=1

Propiedades

Sistemas operativos: Cualquiera
Etiquetas: bottlerocketnetwork
Referencia: CIS Bottlerocket Benchmark v1.0.0 - 3.2.3 Ensure secure ICMP redirects are not accepted

Verificar este host

Ejecute esto en un equipo que tenga permiso para auditar. El escaneo es de solo lectura.

shell

tmaegis scan --target bottlerocket --level 2