Detections
Analytics

1.427 OL09-00-006022

Information

OL 9 must log IPv4 packets with impossible addresses.

GROUP ID: V-271866
RULE ID: SV-271866r1092310

The presence of "martian" packets (which have impossible addresses) as well as spoofed packets, source-routed packets, and redirects could be a sign of nefarious network activity. Logging these packets enables this activity to be detected.

Solution

Configure OL 9 to log martian packets on IPv4 interfaces.

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

net.ipv4.conf.all.log_martians=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-271866r1092310_rule, STIG-ID|OL09-00-006022, Vuln-ID|V-271866

Plugin: Unix

Control ID: a3953fb38a18d7190d9f9f9769a604de2fa99e5bb9610ace9be93135e8952ed3