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The Red Hat Enterprise Linux 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-72285 | RHEL-07-040620 | SV-86909r2_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 |
|---|---|
| Red Hat Enterprise Linux 7 Security Technical Implementation Guide | 2018-11-28 |
Details
| Check Text ( C-72519r2_chk ) |
|---|
| Verify the system does not accept IPv4 source-routed packets by default. # grep net.ipv4.conf.default.accept_source_route /etc/sysctl.conf /etc/sysctl.d/* net.ipv4.conf.default.accept_source_route = 0 If " net.ipv4.conf.default.accept_source_route " is not configured in the /etc/sysctl.conf file or in the /etc/sysctl.d/ directory, is commented out, or does not have a value of "0", this is a finding. Check that the operating system implements the accept source route variable with the following command: # /sbin/sysctl -a | grep 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", this is a finding. |
| Fix Text (F-78639r2_fix) |
|---|
| Set the system to the required kernel parameter by adding the following line to "/etc/sysctl.conf" or a configuration file in the /etc/sysctl.d/ directory (or modify the line to have the required value): net.ipv4.conf.default.accept_source_route = 0 Issue the following command to make the changes take effect: # sysctl --system |