Detections
Analytics

1.432 OL09-00-006027

Information

OL 9 must use a reverse-path filter for IPv4 network traffic, when possible, by default.

GROUP ID: V-271871
RULE ID: SV-271871r1172843

Enabling reverse path filtering drops packets with source addresses that should not have been able to be received on the interface on which they were received. It must not be used on systems that are routers for complicated networks but is helpful for end hosts and routers serving small networks.

Solution

Configure OL 9 to use reverse path filtering on IPv4 interfaces by default.

Add or edit the following line in a single system configuration file in the "/etc/sysctl.d/" directory:

net.ipv4.conf.default.rp_filter = 1

Load settings from all system configuration files with the following command:

$ sudo sysctl --system

See Also

https://workbench.cisecurity.org/benchmarks/27024

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CCI|CCI-000366, Rule-ID|SV-271871r1172843_rule, STIG-ID|OL09-00-006027, Vuln-ID|V-271871

Plugin: Unix

Control ID: caa943fcfa8e16e72021a7099a11b06e041b54f4b4710a981b520ab7fbfd1287