UCF STIG Viewer Logo
Changes are coming to https://stigviewer.com. Take our survey to help us understand your usage and how we can better serve you in the future.
Take Survey

The system must not respond to Internet Control Message Protocol v4 (ICMPv4) echoes sent to a broadcast address.


Overview

Finding ID Version Rule ID IA Controls Severity
V-22410 GEN003603 SV-37608r1_rule ECSC-1 Medium
Description
Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.
STIG Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide 2016-06-01

Details

Check Text ( C-36776r1_chk )
Verify the system does not respond to ICMP ECHO_REQUESTs set to broadcast addresses.

Procedure:
# cat /proc/sys/net/ipv4/icmp_echo_ignore_broadcasts

If the result is not 1, this is a finding.
Fix Text (F-31641r1_fix)
Configure the system to not respond to ICMP ECHO_REQUESTs sent to broadcast addresses. Edit /etc/sysctl.conf and add a setting for "net.ipv4.icmp_echo_ignore_broadcasts=1" and reload the sysctls.

Procedure:
# echo "net.ipv4.icmp_echo_ignore_broadcasts=1" >> /etc/sysctl.conf
# sysctl -p