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The system must not respond to Internet Control Message Protocol (ICMPv4) echoes sent to a broadcast address.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-22410 | GEN003603 M6 | SV-38201r1_rule | ECSC-1 | Medium |
| Description |
|---|
| Responding to broadcast ICMP echoes facilitates network mapping and provides a vector for amplification attacks. |
| STIG | Date |
|---|---|
| MAC OSX 10.6 Workstation Security Technical Implementation Guide | 2013-04-09 |
Details
| Check Text ( C-37658r1_chk ) |
|---|
| Open a terminal session and enter the following command to view the value of "net.inet.icmp.bmcastecho". sysctl -a | grep net.inet.icmp.bmcastecho If the value is not set to "1", this is a finding. |
| Fix Text (F-32899r1_fix) |
|---|
| Open a terminal session and edit the /etc/sysctl.conf file and add the following line. net.inet.icmp.bmcastecho=1 NOTE: If the sysctl.conf file does not exist use the following command to create one. touch /etc/sysctl.conf |