{"description": "Emergency mode is intended as a system recovery\nmethod, providing a single user root access to the system\nduring a failed boot sequence.\n<br /><br />\nBy default, Emergency mode is protected by requiring a password and is set\nin <tt>/usr/lib/systemd/system/emergency.service</tt>.", "rationale": "This prevents attackers with physical access from trivially bypassing security\non the machine and gaining root access. Such accesses are further prevented\nby configuring the bootloader password.", "severity": "medium", "references": {"cis-csc": ["1", "11", "12", "14", "15", "16", "18", "3", "5"], "cobit5": ["DSS05.02", "DSS05.04", "DSS05.05", "DSS05.07", "DSS05.10", "DSS06.03", "DSS06.06", "DSS06.10"], "cui": ["3.1.1", "3.4.5"], "hipaa": ["164.308(a)(1)(ii)(B)", "164.308(a)(7)(i)", "164.308(a)(7)(ii)(A)", "164.310(a)(1)", "164.310(a)(2)(i)", "164.310(a)(2)(ii)", "164.310(a)(2)(iii)", "164.310(b)", "164.310(c)", "164.310(d)(1)", "164.310(d)(2)(iii)"], "isa-62443-2009": ["4.3.3.2.2", "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"], "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"], "iso27001-2013": ["A.18.1.4", "A.6.1.2", "A.7.1.1", "A.9.1.2", "A.9.2.1", "A.9.2.2", "A.9.2.3", "A.9.2.4", "A.9.2.6", "A.9.3.1", "A.9.4.1", "A.9.4.2", "A.9.4.3", "A.9.4.4", "A.9.4.5"], "nist": ["IA-2", "AC-3", "CM-6(a)"], "nist-csf": ["PR.AC-1", "PR.AC-4", "PR.AC-6", "PR.AC-7", "PR.PT-3"], "srg": ["SRG-OS-000080-GPOS-00048"], "ism": ["0421", "0422", "0974", "1173", "1401", "1504", "1505", "1546", "1557", "1558", "1559", "1560", "1561"]}, "control_references": {"ism": ["0421", "0422", "0974", "1173", "1401", "1504", "1505", "1546", "1557", "1558", "1559", "1560", "1561"]}, "components": [], "identifiers": {}, "ocil_clause": "the output is different", "ocil": "To check if authentication is required for emergency mode, run the following command:\n<pre>$ grep sulogin /usr/lib/systemd/system/emergency.service</pre>\nThe output should be similar to the following, and the line must begin with\nExecStart and /sbin/sulogin.\n    <pre>ExecStart=-/bin/sh -c \"/sbin/sulogin; /usr/bin/systemctl --fail --no-block default\"</pre>\n\nThen, check if the emergency target requires the emergency service:\nRun the following command:\n<pre>$ sudo grep Requires /usr/lib/systemd/system/emergency.target</pre>\nThe output should be the following:\n<pre>Requires=emergency.service</pre>\n\nThen, check if there is no custom emergency target configured in systemd configuration.\nRun the following command:\n<pre>$ sudo grep -r emergency.target /etc/systemd/system/</pre>\nThe output should be empty.\n\nThen, check if there is no custom emergency service configured in systemd configuration.\nRun the following command:\n<pre>$ sudo grep -r emergency.service /etc/systemd/system/</pre>\nThe output should be empty.", "oval_external_content": null, "fixtext": "Configure Ubuntu 22.04 to require authentication for system emergency mode.\n\nAdd or edit the following line in \"/usr/lib/systemd/system/emergency.service\":\nExecStart=-/bin/sh -c \"/sbin/sulogin; /usr/bin/systemctl --fail --no-block default\"", "checktext": "", "vuldiscussion": "", "srg_requirement": "Ubuntu 22.04 must require authentication upon booting into emergency mode.", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {"stig": {"srg_requirement": "Ubuntu 22.04 must require authentication to access emergency mode.", "vuldiscussion": "To mitigate the risk of unauthorized access to sensitive information by entities that have been issued certificates by DOD-approved PKIs, all DOD systems (e.g., web servers and web portals) must be properly configured to incorporate access control methods that do not rely solely on the possession of a certificate for access. Successful authentication must not automatically give an entity access to an asset or security boundary. Authorization procedures and controls must be implemented to ensure each authenticated entity also has a validated and current authorization. Authorization is the process of determining whether an entity, once authenticated, is permitted to access a specific asset. Information systems use access control policies and enforcement mechanisms to implement this requirement.\n\nThis requirement prevents attackers with physical access from trivially bypassing security on the machine and gaining root access. Such accesses are further prevented by configuring the bootloader password.", "checktext": "Verify that Ubuntu 22.04 requires authentication for emergency mode with the following command:\n\n$ grep sulogin /usr/lib/systemd/system/emergency.service\n\nExecStart=-/usr/lib/systemd/systemd-sulogin-shell emergency\n\nIf this line is not returned, or is commented out, this is a finding. If the output is different, this is a finding.", "fixtext": "Configure Ubuntu 22.04 to require authentication for emergency mode.\n\nAdd or modify the following line in the \"/usr/lib/systemd/system/emergency.service\" file:\n\nExecStart=-/usr/lib/systemd/systemd-sulogin-shell emergency"}}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Require Authentication for Emergency Systemd Target", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/accounts/accounts-physical/require_emergency_target_auth/rule.yml", "template": null}