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The macOS system must not send IPv4 ICMP redirects by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-81705 | AOSX-13-001210 | SV-96419r1_rule | Medium |
| Description |
|---|
| ICMP redirects are broadcast to reshape network traffic. A malicious user could use the system to send fake redirect packets and try to force all network traffic to pass through a network sniffer. Disabling ICMP redirect broadcasts mitigates this risk. |
| STIG | Date |
|---|---|
| Apple OS X 10.13 Security Technical Implementation Guide | 2019-03-08 |
Details
| Check Text ( C-81485r1_chk ) |
|---|
| To check if the system is configured to send ICMP redirects, run the following command: sysctl net.inet.ip.redirect If the values are not set to "0", this is a finding. |
| Fix Text (F-88553r1_fix) |
|---|
| To configure the system to not send ICMP redirects, add the following line to "/etc/sysctl.conf", creating the file if necessary: net.inet.ip.redirect=0 |