The SUSE operating system must not respond to Internet Protocol version 4 (IPv4) Internet Control Message Protocol (ICMP) echoes sent to a broadcast address.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-217290 | SRG-OS-000480-GPOS-00227 | SLES-12-030380 | SV-217290r991589_rule | 2024-11-25 | 3 |
| Description |
|---|
| Responding to broadcast (ICMP) echoes facilitates network mapping and provides a vector for amplification attacks. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |