Ensure source routed packets are not accepted

NiedrigStufe 2Automatisiertbottlerocket

Beschreibung

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).

So wird geprüft

Prüfmethode: Shell-Befehl

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

Erwartete Ausgabe: compliant

So wird behoben

Behebungsmethode: Anleitung oder Infrastruktur-Patch

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

Eigenschaften

Betriebssysteme: Beliebig
Tags: bottlerocketnetwork
Referenz: CIS Bottlerocket Benchmark v1.0.0 - 3.2.1 Ensure source routed packets are not accepted

Diesen Host prüfen

Führen Sie dies auf einem Rechner aus, den Sie prüfen dürfen. Der Scan ist schreibgeschützt.

shell

tmaegis scan --target bottlerocket --level 2