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SLEM 5 must not forward Internet Protocol version 4 (IPv4) source-routed packets by default.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-261314 | SLEM-05-253015 | SV-261314r996412_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 Micro (SLEM) 5 Security Technical Implementation Guide | 2024-06-04 |
Details
| Check Text ( C-65043r996410_chk ) |
|---|
| Verify SLEM 5 does not accept IPv4 source-routed packets by default 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-64951r996411_fix) |
|---|
| Configure SLEM 5 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 |