{"description": "Edit <tt>/etc/dhcp/dhcpd.conf</tt> and add or correct the following\nglobal option to prevent the DHCP server from responding the DHCPDECLINE\nmessages, if possible: <pre>deny declines;</pre>", "rationale": "The DHCPDECLINE message can be sent by a DHCP client to indicate\nthat it does not consider the lease offered by the server to be valid. By\nissuing many DHCPDECLINE messages, a malicious client can exhaust the DHCP\nserver's pool of IP addresses, causing the DHCP server to forget old address\nallocations.", "severity": "unknown", "references": {"cis-csc": ["11", "14", "3", "9"], "cobit5": ["BAI10.01", "BAI10.02", "BAI10.03", "BAI10.05", "DSS05.02", "DSS05.05", "DSS06.06"], "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 7.6"], "iso27001-2013": ["A.12.1.2", "A.12.5.1", "A.12.6.2", "A.14.2.2", "A.14.2.3", "A.14.2.4", "A.9.1.2"], "nist": ["CM-7(a)", "CM-7(b)", "CM-6(a)"], "nist-csf": ["PR.IP-1", "PR.PT-3"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": null, "ocil": null, "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": [], "cpe_platform_names": [], "inherited_cpe_platform_names": [], "bash_conditional": null, "fixes": {}, "title": "Deny Decline Messages", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/services/dhcp/dhcp_server_configuration/dhcp_server_deny_decline/rule.yml", "template": null}