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-256568 | PHTN-30-000099 | SV-256568r991589_rule | CCI-000366 | medium |
| Description | ||||
| Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. | ||||
| STIG | Date | |||
| VMware vSphere 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2024-12-16 | |||
Details
Check Text (C-256568r991589_chk)
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 (F-60186r887377_fix)
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