The Photon operating system must log IPv4 packets with impossible addresses.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
| V-256572 | PHTN-30-000103 | SV-256572r991589_rule | CCI-000366 | 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 7.0 vCenter Appliance Photon OS Security Technical Implementation Guide | 2024-12-16 | |||
Details
Check Text (C-256572r991589_chk)
At the command line, run 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-60190r887389_fix)
At the command line, run the following command:
# for SETTING in $(/sbin/sysctl -aN --pattern "net.ipv4.conf.(all|default|eth.*).log_martians"); do sed -i -e "/^${SETTING}/d" /etc/sysctl.conf;echo $SETTING=1>>/etc/sysctl.conf; done
# /sbin/sysctl --load