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The macOS system must not accept source-routed IPv4 packets.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-81697 | AOSX-13-001195 | SV-96411r1_rule | Medium |
| Description |
|---|
| A source-routed packet attempts to specify the network path the packet should take. If the system is not configured to block the incoming source-routed packets, an attacker can redirect the system's network traffic. Configuring the system to drop incoming source-routed IPv4 packets mitigates this risk. |
| STIG | Date |
|---|---|
| Apple OS X 10.13 Security Technical Implementation Guide | 2019-12-20 |
Details
| Check Text ( C-81477r1_chk ) |
|---|
| To check if the system is configured to accept "source-routed" packets, run the following command: sysctl net.inet.ip.accept_sourceroute If the value is not "0", this is a finding. |
| Fix Text (F-88545r1_fix) |
|---|
| To configure the system to not accept "source-routed" packets, add the following line to "/etc/sysctl.conf", creating the file if necessary: net.inet.ip.accept_sourceroute=0 |