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The SUSE operating system must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-235016 | SLES-15-040320 | SV-235016r991589_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 |
|---|---|
| SUSE Linux Enterprise Server 15 Security Technical Implementation Guide | 2024-05-30 |
Details
| Check Text ( C-38204r619317_chk ) |
|---|
| Verify the SUSE operating system does not accept IPv4 source-routed packets by default. Check the value of the default IPv4 accept source route variable with the following command: > sudo sysctl net.ipv4.conf.default.accept_source_route net.ipv4.conf.default.accept_source_route = 0 If the network parameter "ipv4.conf.default.accept_source_route" is not equal to "0" or nothing is returned, this is a finding. |
| Fix Text (F-38167r619318_fix) |
|---|
| Configure the SUSE operating system to disable IPv4 default source routing by running the following command as an administrator: > sudo sysctl -w net.ipv4.conf.default.accept_source_route=0 If "0" is not the system's default value, add or update the following line in "/etc/sysctl.d/99-stig.conf": > sudo sh -c 'echo "net.ipv4.conf.default.accept_source_route=0" >> /etc/sysctl.d/99-stig.conf' > sudo sysctl --system |