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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 | 2022-01-03 |
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 |