Enable Kernel Parameter to Log Martian Packets on all IPv4 Interfaces

An XCCDF Rule

Description

To set the runtime status of the net.ipv4.conf.all.log_martians kernel parameter, run the following command:

$ sudo sysctl -w net.ipv4.conf.all.log_martians=1

To make sure that the setting is persistent, add the following line to a file in the directory /etc/sysctl.d:

net.ipv4.conf.all.log_martians = 1

Rationale

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.

ID: xccdf_org.ssgproject.content_rule_sysctl_net_ipv4_conf_all_log_martians
Severity: Unknown
References: 1 11 12 13 14 15 16 2 3 7 8 9

APO13.01 BAI04.04 BAI10.01 BAI10.02 BAI10.03 BAI10.05 DSS01.03 DSS01.04 DSS03.05 DSS05.02 DSS05.03 DSS05.05 DSS05.07 DSS06.06

3.1.20

CCI-000126

4.3.3.5.1 4.3.3.5.2 4.3.3.5.3 4.3.3.5.4 4.3.3.5.5 4.3.3.5.6 4.3.3.5.7 4.3.3.5.8 4.3.3.6.1 4.3.3.6.2 4.3.3.6.3 4.3.3.6.4 4.3.3.6.5 4.3.3.6.6 4.3.3.6.7 4.3.3.6.8 4.3.3.6.9 4.3.3.7.1 4.3.3.7.2 4.3.3.7.3 4.3.3.7.4 4.3.4.3.2 4.3.4.3.3

SR 1.1 SR 1.10 SR 1.11 SR 1.12 SR 1.13 SR 1.2 SR 1.3 SR 1.4 SR 1.5 SR 1.6 SR 1.7 SR 1.8 SR 1.9 SR 2.1 SR 2.2 SR 2.3 SR 2.4 SR 2.5 SR 2.6 SR 2.7 SR 3.1 SR 3.5 SR 3.8 SR 4.1 SR 4.3 SR 5.1 SR 5.2 SR 5.3 SR 6.2 SR 7.1 SR 7.2 SR 7.6

A.11.2.6 A.12.1.2 A.12.1.3 A.12.5.1 A.12.6.2 A.13.1.1 A.13.2.1 A.14.1.3 A.14.2.2 A.14.2.3 A.14.2.4 A.17.2.1 A.6.2.1 A.6.2.2 A.9.1.2

CM-7(a) CM-7(b) SC-5(3)(a)

DE.CM-1 PR.AC-3 PR.DS-4 PR.IP-1 PR.PT-3 PR.PT-4

SRG-OS-000480-GPOS-00227

CCE-82486-2
Updated: about 1 year ago

---
apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
spec:
  config:
    ignition:      version: 3.1.0
    storage:
      files:
      - contents:
          source: data:,net.ipv4.conf.all.log_martians%3D1%0A
        mode: 0644
        path: /etc/sysctl.d/75-sysctl_net_ipv4_conf_all_log_martians.conf
        overwrite: true

Enable Kernel Parameter to Log Martian Packets on all IPv4 Interfaces

Description

Rationale

Remediation - Kubernetes Patch