Ensure packet redirect sending is disabled

낮음레벨 2자동bottlerocket

설명

ICMP Redirects are used to send routing information to other hosts. As a host itself does not act as a router (in a host only configuration), there is no need to send redirects. The audit reads the running values from /proc/sys. 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 $2)"; bad=1; }; }
chk net.ipv4.conf.all.send_redirects 0
chk net.ipv4.conf.default.send_redirects 0
[ "$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.send_redirects" = "0" "net.ipv4.conf.default.send_redirects" = "0" EOF Run the following command to flush the routing cache: # sysctl -w net.ipv4.route.flush=1

속성

운영 체제: 모두
태그: bottlerocketnetwork
참고 자료: CIS Bottlerocket Benchmark v1.0.0 - 3.1.1 Ensure packet redirect sending is disabled

이 호스트 점검하기

감사 권한이 있는 시스템에서 실행하세요. 스캔은 읽기 전용입니다.

shell

tmaegis scan --target bottlerocket --level 2