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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-77491 | SLES-12-030380 | SV-92187r2_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 | 2019-10-01 |
Details
| Check Text ( C-77051r2_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-84133r2_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 |