The Photon operating system must log IPv4 packets with impossible addresses.
Severity | Group ID | Group Title | Version | Rule ID | Date | STIG Version |
|---|---|---|---|---|---|---|
| medium | V-256572 | SRG-OS-000480-GPOS-00227 | PHTN-30-000103 | SV-256572r991589_rule | 2024-12-16 | 1 |
| 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. |
| ℹ️ Check |
|---|
| 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 |
|---|
| 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 |