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The macOS system must ignore IPv4 ICMP redirect messages.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-81699 | AOSX-13-001200 | SV-96413r1_rule | Medium |
| Description |
|---|
| ICMP redirects are broadcast to reshape network traffic. A malicious user could craft fake redirect packets and try to force all network traffic to pass through a network sniffer. If the system is not configured to ignore these packets, it could be susceptible to this kind of attack. |
| STIG | Date |
|---|---|
| Apple OS X 10.13 Security Technical Implementation Guide | 2019-07-01 |
Details
| Check Text ( C-81479r1_chk ) |
|---|
| To check if the system is configured to ignore "ICMP redirect" messages, run the following command: sysctl net.inet.icmp.drop_redirect If the value is not "1", this is a finding. |
| Fix Text (F-88547r1_fix) |
|---|
| To configure the system to ignore "ICMP redirect" messages, add the following line to "/etc/sysctl.conf", creating the file if necessary: net.inet.icmp.drop_redirect=1 |