Detections
Analytics
OL09-00-006027 - OL 9 must use a reverse-path filter for IPv4 network traffic, when possible, by default.
Information
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://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_Oracle_Linux_9_V1R6_STIG.zip
Item Details
Audit Name: DISA Oracle Linux 9 STIG v1r6
Category: CONFIGURATION MANAGEMENT
References: 800-53|CM-6b., CAT|II, CCI|CCI-000366, Rule-ID|SV-271871r1172843_rule, STIG-ID|OL09-00-006027, Vuln-ID|V-271871
Plugin: Unix
Control ID: 5d2c1f217b05335bfa1e7480f517f33bbe31863e3ff87c2b3b2c055d464be181