The SUSE operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-217287 | SLES-12-030360 | SV-217287r991589_rule | Medium |
| Description |
| Source-routed packets allow the source of the packet to suggest that routers forward the packet along a different path than configured on the router, which can be used to bypass network security measures. This requirement applies only to the forwarding of source-routed traffic, such as when IPv4 forwarding is enabled and the system is functioning as a router. |
| STIG | Date |
| SLES 12 Security Technical Implementation Guide | 2024-11-25 |
Details
| Check Text (C-18515r370017_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.conf.all.accept_source_route net.ipv4.conf.all.accept_source_route = 0 If the returned line does not have a value of "0" this is a finding. |
| Fix Text (F-18513r370018_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.conf.all.accept_source_route = 0 Run the following command to apply this value: # sysctl --system |