{"description": "To set the runtime status of the <code>net.ipv4.icmp_ignore_bogus_error_responses</code> kernel parameter, run the following command: <pre>$ sudo sysctl -w net.ipv4.icmp_ignore_bogus_error_responses=1</pre>\nTo make sure that the setting is persistent, add the following line to a file in the directory <tt>/etc/sysctl.d</tt>: <pre>net.ipv4.icmp_ignore_bogus_error_responses = 1</pre>", "rationale": "Ignoring bogus ICMP error responses reduces\nlog size, although some activity would not be logged.", "severity": "unknown", "references": {"cis-csc": ["1", "11", "12", "13", "14", "15", "16", "2", "3", "7", "8", "9"], "cobit5": ["APO13.01", "BAI04.04", "BAI10.01", "BAI10.02", "BAI10.03", "BAI10.05", "DSS01.03", "DSS03.05", "DSS05.02", "DSS05.05", "DSS05.07", "DSS06.06"], "cui": ["3.1.20"], "isa-62443-2009": ["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"], "isa-62443-2013": ["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 6.2", "SR 7.1", "SR 7.2", "SR 7.6"], "iso27001-2013": ["A.12.1.2", "A.12.1.3", "A.12.5.1", "A.12.6.2", "A.14.2.2", "A.14.2.3", "A.14.2.4", "A.17.2.1", "A.9.1.2"], "nerc-cip": ["CIP-007-3 R4", "CIP-007-3 R4.1", "CIP-007-3 R4.2", "CIP-007-3 R5.1"], "nist": ["CM-7(a)", "CM-7(b)", "SC-5"], "nist-csf": ["DE.CM-1", "PR.DS-4", "PR.IP-1", "PR.PT-3"], "pcidss": ["Req-1.4.3"], "srg": ["SRG-OS-000480-GPOS-00227"], "anssi": ["R12"], "cis": ["3.3.3"], "pcidss4": ["1.4.2", "1.4"]}, "control_references": {"anssi": ["R12"], "cis": ["3.3.3"], "pcidss4": ["1.4.2", "1.4"]}, "components": [], "identifiers": {}, "ocil_clause": "the correct value is not returned", "ocil": "The runtime status of the <code>net.ipv4.icmp_ignore_bogus_error_responses</code> kernel parameter can be queried\nby running the following command:\n<pre>$ sysctl net.ipv4.icmp_ignore_bogus_error_responses</pre>\n<code>1</code>.\n", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {"stig": {"srg_requirement": "Ubuntu 22.04 must limit the number of bogus Internet Control Message Protocol (ICMP) response errors logs.", "vuldiscussion": "Some routers will send responses to broadcast frames that violate RFC-1122, which fills up a log file system with many useless error messages. An attacker may take advantage of this and attempt to flood the logs with bogus error logs. Ignoring bogus ICMP error responses reduces log size, although some activity would not be logged.", "checktext": "The runtime status of the net.ipv4.icmp_ignore_bogus_error_responses kernel parameter can be queried by running the following command:\n\n$ sudo sysctl net.ipv4.icmp_ignore_bogus_error_responses\n\nnet.ipv4.icmp_ignore_bogus_error_responses = 1\n\nIf \"net.ipv4.icmp_ignore_bogus_error_responses\" is not set to \"1\", this is a finding.\n\nCheck that the configuration files are present to enable this network parameter.\n\n$ sudo /usr/lib/systemd/systemd-sysctl --cat-config | egrep -v '^(#|;)' | grep -F net.ipv4.icmp_ignore_bogus_error_response | tail -1\n\nnet.ipv4.icmp_ignore_bogus_error_response = 1\n\nIf \"net.ipv4.icmp_ignore_bogus_error_response\" is not set to \"1\" or is missing, this is a finding.", "fixtext": "Configure Ubuntu 22.04 to not log bogus ICMP errors:\n\nAdd or edit the following line in a single system configuration file, in the \"/etc/sysctl.d/\" directory:\n\nnet.ipv4.icmp_ignore_bogus_error_responses = 1\n\nLoad settings from all system configuration files with the following command:\n\n$ sudo sysctl --system"}}, "platform": null, "platforms": [], "sce_metadata": {"check-import": "stdout", "check-export": ["sysctl_net_ipv4_icmp_ignore_bogus_error_responses_value=xccdf_org.ssgproject.content_value_sysctl_net_ipv4_icmp_ignore_bogus_error_responses_value"], "platform": ["multi_platform_all"], "environment": "any", "filename": "sysctl_net_ipv4_icmp_ignore_bogus_error_responses.sh", "relative_path": "ubuntu2204/checks/sce/sysctl_net_ipv4_icmp_ignore_bogus_error_responses.sh"}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Enable Kernel Parameter to Ignore Bogus ICMP Error Responses on IPv4 Interfaces", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/network/network-kernel/network_host_and_router_parameters/sysctl_net_ipv4_icmp_ignore_bogus_error_responses/rule.yml", "template": {"name": "sysctl", "vars": {"sysctlvar": "net.ipv4.icmp_ignore_bogus_error_responses", "datatype": "int"}, "backends": {}}}