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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-258887 | PHTN-40-000224 | SV-258887r933722_rule | Medium |
| Description |
|---|
| Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
| STIG | Date |
|---|---|
| VMware vSphere 8.0 vCenter Appliance Photon OS 4.0 Security Technical Implementation Guide | 2023-10-29 |
Details
| Check Text ( C-62627r933720_chk ) |
|---|
| At the command line, run the following command to verify ICMP echoes sent to a broadcast address are ignored: # /sbin/sysctl net.ipv4.icmp_echo_ignore_broadcasts Example result: net.ipv4.icmp_echo_ignore_broadcasts = 1 If the "net.ipv4.icmp_echo_ignore_broadcasts" kernel parameter is not set to "1", this is a finding. |
| Fix Text (F-62536r933721_fix) |
|---|
| Navigate to and open: /etc/sysctl.d/zz-stig-hardening.conf Add or update the following line: net.ipv4.icmp_echo_ignore_broadcasts = 1 At the command line, run the following command to load the new configuration: # /sbin/sysctl --load /etc/sysctl.d/zz-stig-hardening.conf Note: If the file zz-stig-hardening.conf does not exist, it must be created. |