Ensure source routed packets are not accepted

낮음레벨 2자동bottlerocket

설명

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).

점검 방법

감사 방식: 셸 명령

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

예상 출력: compliant

조치 방법

조치 방식: 가이드 또는 인프라 패치

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

속성

운영 체제: 모두
태그: bottlerocketnetwork
참고 자료: CIS Bottlerocket Benchmark v1.0.0 - 3.2.1 Ensure source routed packets are not accepted

이 호스트 점검하기

감사 권한이 있는 시스템에서 실행하세요. 스캔은 읽기 전용입니다.

shell

tmaegis scan --target bottlerocket --level 2