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The Ubuntu 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-215147 | UBTU-16-030540 | SV-215147r508033_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 |
|---|---|
| Canonical Ubuntu 16.04 LTS Security Technical Implementation Guide | 2020-09-03 |
Details
| Check Text ( C-16346r285309_chk ) |
|---|
| Verify the Ubuntu operating system does not accept Internet Protocol version 4 (IPv4) source-routed packets by default. Check the value of the 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 returned line does not have a value of "0", a line is not returned, or the returned line is commented out, this is a finding. |
| Fix Text (F-16344r285310_fix) |
|---|
| Configure the Ubuntu operating system to not forward Internet Protocol version 4 (IPv4) source-routed packets by default with the following command: # sudo sysctl -w net.ipv4.conf.default.accept_source_route=0 If "0" is not the system's default value then add or update the following line in "/etc/sysctl.conf" or in the appropriate file under "/etc/sysctl.d": net.ipv4.conf.default.accept_source_route=0 |