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1.190 RHEL-09-253050

Information

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

GROUP ID: V-257965
RULE ID: SV-257965r991589

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 RHEL 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/22008

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-257965r991589_rule, STIG-ID|RHEL-09-253050, Vuln-ID|V-257965

Plugin: Unix

Control ID: 9e8cb2e4bb7c2d5bfdfaad82039ac8bb94b3670b9a650edc544891e3b2e6e4fb