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 Photon operating system must log IPv4 packets with impossible addresses.


Overview

Finding ID Version Rule ID IA Controls Severity
V-239180 PHTN-67-000109 SV-239180r816666_rule Medium
Description
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.
STIG Date
VMware vSphere 6.7 Photon OS Security Technical Implementation Guide 2022-01-03

Details

Check Text ( C-42391r675346_chk )
At the command line, execute the following command:

# /sbin/sysctl -a --pattern "net.ipv4.conf.(all|default|eth.*).log_martians"

Expected result:

net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.eth0.log_martians = 1

If the output does not match the expected result, this is a finding.

Note: The number of "ethx" lines returned is dependent on the number of interfaces. Every "ethx" entry must be set to "1".
Fix Text (F-42350r816665_fix)
Open /etc/sysctl.conf with a text editor.

Add or update the following lines:

net.ipv4.conf.all.log_martians = 1
net.ipv4.conf.default.log_martians = 1
net.ipv4.conf.eth0.log_martians = 1

Run the following command to load the new setting:

# /sbin/sysctl --load