Vulnerability Discussion
Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.
Ignoring ICMP echo requests (pings) sent to broadcast or multicast addresses makes the system slightly more difficult to enumerate on the network.
Check
Verify RHEL 9 does not respond to ICMP echoes sent to a broadcast address.
Check the value of the "icmp_echo_ignore_broadcasts" variable with the following command:
$ sudo sysctl net.ipv4.icmp_echo_ignore_broadcasts
net.ipv4.icmp_echo_ignore_broadcasts = 1
If the returned line does not have a value of "1", a line is not returned, or the retuned line is commented out, this is a finding.
Check that the configuration files are present to enable this network parameter.
$ sudo /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|$)' | grep -F net.ipv4.icmp_echo_ignore_broadcasts | tail -1
net.ipv4.icmp_echo_ignore_broadcasts = 1
If "net.ipv4.icmp_echo_ignore_broadcasts" is not set to "1" or is missing, this is a finding.
Fix
Configure RHEL 9 to not respond to IPv4 ICMP echoes sent to a broadcast address.
Add or edit the following line in a single system configuration file, in the "/etc/sysctl.d/" directory:
net.ipv4.icmp_echo_ignore_broadcasts = 1
Load settings from all system configuration files with the following command:
$ sudo sysctl --system