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The Photon operating system must not respond to IPv4 Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.


Overview

Finding ID Version Rule ID IA Controls Severity
V-239176 PHTN-67-000105 SV-239176r816658_rule Medium
Description
Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.
STIG Date
VMware vSphere 6.7 Photon OS Security Technical Implementation Guide 2022-06-17

Details

Check Text ( C-42387r675334_chk )
At the command line, execute the following command:

# /sbin/sysctl -a --pattern ignore_broadcasts

Expected result:

net.ipv4.icmp_echo_ignore_broadcasts = 1

If the output does not match the expected result, this is a finding.
Fix Text (F-42346r816657_fix)
Open /etc/sysctl.conf with a text editor.

Add or update the following line:

net.ipv4.icmp_echo_ignore_broadcasts=1

Run the following command to load the new setting:

# /sbin/sysctl --load