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V-256568

CAT II (Medium)

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

Rule ID

SV-256568r991589_rule

STIG

VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide

Version

V1R4

CCIs

CCI-000366

Discussion

Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks.

Check Content

At the command line, run 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

At the command line, run the following commands:

# sed -i -e "/^net.ipv4.icmp_echo_ignore_broadcasts/d" /etc/sysctl.conf
# echo net.ipv4.icmp_echo_ignore_broadcasts=1>>/etc/sysctl.conf
# /sbin/sysctl --load