Ensure bogus ICMP responses are ignored

SrednjaNivo 1Automatskabottlerocket

Opis

Setting icmp_ignore_bogus_error_responses to 1 prevents the kernel from logging bogus responses (RFC-1122 non-compliant) from broadcast reframes, keeping file systems from filling up with useless log messages. The audit reads the running value from /proc/sys. Run tmaegis on the host through the admin container root shell (sudo sheltie).

Kako se proverava

Metod provere: Komanda ljuske

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 $2)"; bad=1; }; }
chk net.ipv4.icmp_ignore_bogus_error_responses 1
[ "$bad" -eq 0 ] && echo compliant

Očekivani izlaz: compliant

Kako se ispravlja

Metod ispravke: Smernica ili zakrpa infrastrukture

Run the following command to set the active kernel parameter and persist the setting: # apiclient apply <<EOF [settings.kernel.sysctl] "net.ipv4.icmp_ignore_bogus_error_responses" = "1" EOF Run the following command to flush the routing cache: # sysctl -w net.ipv4.route.flush=1

Svojstva

Operativni sistemi: Bilo koji
Oznake: bottlerocketnetwork
Referenca: CIS Bottlerocket Benchmark v1.0.0 - 3.2.6 Ensure bogus ICMP responses are ignored

Proverite ovaj računar

Pokrenite ovo na računaru za koji imate dozvolu za proveru. Skeniranje radi u režimu samo za čitanje.

shell

tmaegis scan --target bottlerocket