Ensure source routed packets are not accepted

FaibleNiveau 2Automatiséebottlerocket

Description

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 addresses vs. The audit reads the running values from /proc/sys (IPv6 keys only when IPv6 is enabled). Run tmaegis on the host through the admin container root shell (sudo sheltie).

Méthode de vérification

Méthode d'audit: Commande 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 $2)"; bad=1; }; }
chk net.ipv4.conf.all.accept_source_route 0
chk net.ipv4.conf.default.accept_source_route 0
[ -d /proc/sys/net/ipv6 ] && chk net.ipv6.conf.all.accept_source_route 0
[ -d /proc/sys/net/ipv6 ] && chk net.ipv6.conf.default.accept_source_route 0
[ "$bad" -eq 0 ] && echo compliant

Sortie attendue: compliant

Méthode de correction

Méthode de correction: Recommandation ou correctif d'infrastructure

Run the following command to set the active kernel parameters and persist the settings: # apiclient apply <<EOF [settings.kernel.sysctl] "net.ipv4.conf.all.accept_source_route" = "0" "net.ipv4.conf.default.accept_source_route" = "0" "net.ipv6.conf.all.accept_source_route" = "0" "net.ipv6.conf.default.accept_source_route" = "0" EOF Run the following command to flush the routing caches: # sysctl -w net.ipv4.route.flush=1 # sysctl -w net.ipv6.route.flush=1

Propriétés

Systèmes d'exploitation: Tous
Étiquettes: bottlerocketnetwork
Référence: CIS Bottlerocket Benchmark v1.0.0 - 3.2.1 Ensure source routed packets are not accepted

Vérifier cet hôte

Exécutez cette commande sur une machine que vous êtes autorisé à auditer. L'analyse est en lecture seule.

shell

tmaegis scan --target bottlerocket --level 2