The SUSE operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-217290 | SLES-12-030380 | SV-217290r991589_rule | Medium |
| Description |
| Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
| STIG | Date |
| SLES 12 Security Technical Implementation Guide | 2024-11-25 |
Details
| Check Text (C-18518r370026_chk) |
| Verify the SUSE operating system does not accept IPv4 source-routed packets. Check the value of the accept source route variable with the following command: # sysctl net.ipv4.icmp_echo_ignore_broadcasts net.ipv4.icmp_echo_ignore_broadcasts = 1 If the returned line does not have a value of "1" this is a finding. |
| Fix Text (F-18516r370027_fix) |
| Configure the SUSE operating system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" (or modify the line to have the required value): net.ipv4.icmp_echo_ignore_broadcasts = 1 Run the following command to apply this value: # sysctl --system |