UCF STIG Viewer Logo
Changes are coming to https://stigviewer.com. Take our survey to help us understand your usage and how we can better serve you in the future.
Take Survey

The system must not accept IPv4 source-routed packets on any interface.


Overview

Finding ID Version Rule ID IA Controls Severity
V-38523 RHEL-06-000083 SV-50324r2_rule Medium
Description
Accepting source-routed packets in the IPv4 protocol has few legitimate uses. It should be disabled unless it is absolutely required.
STIG Date
Red Hat Enterprise Linux 6 Security Technical Implementation Guide 2018-11-28

Details

Check Text ( C-46081r3_chk )
The status of the "net.ipv4.conf.all.accept_source_route" kernel parameter can be queried by running the following command:

$ sysctl net.ipv4.conf.all.accept_source_route

The output of the command should indicate a value of "0". If this value is not the default value, investigate how it could have been adjusted at runtime, and verify it is not set improperly in "/etc/sysctl.conf".

$ grep net.ipv4.conf.all.accept_source_route /etc/sysctl.conf

If the correct value is not returned, this is a finding.
Fix Text (F-43471r1_fix)
To set the runtime status of the "net.ipv4.conf.all.accept_source_route" kernel parameter, run the following command:

# sysctl -w net.ipv4.conf.all.accept_source_route=0

If this is not the system's default value, add the following line to "/etc/sysctl.conf":

net.ipv4.conf.all.accept_source_route = 0