Ensure source routed packets are not accepted

低レベル 2自動bottlerocket

説明

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).

チェック方法

監査方法: シェルコマンド

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

期待される出力: compliant

修正方法

修正方法: ガイダンスまたは IaC パッチ

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

プロパティ

オペレーティングシステム: すべて
タグ: bottlerocketnetwork
参照: CIS Bottlerocket Benchmark v1.0.0 - 3.2.1 Ensure source routed packets are not accepted

このホストをチェック

監査が許可されているマシンで実行してください。スキャンは読み取り専用です。

shell

tmaegis scan --target bottlerocket --level 2