{"description": "At a minimum, the audit system should collect unauthorized file\naccesses for all users and root. If the <tt>auditd</tt> daemon is configured\nto use the <tt>augenrules</tt> program to read audit rules during daemon\nstartup (the default), add the following lines to a file with suffix\n<tt>.rules</tt> in the directory <tt>/etc/audit/rules.d</tt>:\n<pre>-a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid&gt;=1000 -F auid!=unset -F key=access\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid&gt;=1000 -F auid!=unset -F key=access</pre>\n\nIf the system is 64 bit then also add the following lines:\n<pre>\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid&gt;=1000 -F auid!=unset -F key=access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid&gt;=1000 -F auid!=unset -F key=access</pre>\n\nIf the <tt>auditd</tt> daemon is configured to use the <tt>auditctl</tt>\nutility to read audit rules during daemon startup, add the following lines to\n<tt>/etc/audit/audit.rules</tt> file:\n<pre>-a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid&gt;=1000 -F auid!=unset -F key=access\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid&gt;=1000 -F auid!=unset -F key=access</pre>\n\nIf the system is 64 bit then also add the following lines:\n<pre>\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid&gt;=1000 -F auid!=unset -F key=access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid&gt;=1000 -F auid!=unset -F key=access</pre>", "rationale": "Unsuccessful attempts to access files could be an indicator of malicious activity on a system. Auditing\nthese events could serve as evidence of potential system compromise.", "severity": "medium", "references": {"cis-csc": ["1", "11", "12", "13", "14", "15", "16", "19", "2", "3", "4", "5", "6", "7", "8", "9"], "cobit5": ["APO10.01", "APO10.03", "APO10.04", "APO10.05", "APO11.04", "APO12.06", "APO13.01", "BAI03.05", "BAI08.02", "DSS01.03", "DSS01.04", "DSS02.02", "DSS02.04", "DSS02.07", "DSS03.01", "DSS03.05", "DSS05.02", "DSS05.03", "DSS05.04", "DSS05.05", "DSS05.07", "MEA01.01", "MEA01.02", "MEA01.03", "MEA01.04", "MEA01.05", "MEA02.01"], "cui": ["3.1.7"], "hipaa": ["164.308(a)(1)(ii)(D)", "164.308(a)(3)(ii)(A)", "164.308(a)(5)(ii)(C)", "164.312(a)(2)(i)", "164.312(b)", "164.312(d)", "164.312(e)"], "isa-62443-2009": ["4.2.3.10", "4.3.2.6.7", "4.3.3.3.9", "4.3.3.5.8", "4.3.3.6.6", "4.3.4.4.7", "4.3.4.5.6", "4.3.4.5.7", "4.3.4.5.8", "4.4.2.1", "4.4.2.2", "4.4.2.4"], "isa-62443-2013": ["SR 1.13", "SR 2.10", "SR 2.11", "SR 2.12", "SR 2.6", "SR 2.8", "SR 2.9", "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 6.1", "SR 6.2", "SR 7.1", "SR 7.6"], "iso27001-2013": ["A.11.2.6", "A.12.4.1", "A.12.4.2", "A.12.4.3", "A.12.4.4", "A.12.7.1", "A.13.1.1", "A.13.2.1", "A.14.1.3", "A.14.2.7", "A.15.2.1", "A.15.2.2", "A.16.1.4", "A.16.1.5", "A.16.1.7", "A.6.2.1", "A.6.2.2"], "nist": ["AU-2(d)", "AU-12(c)", "CM-6(a)"], "nist-csf": ["DE.AE-3", "DE.AE-5", "DE.CM-1", "DE.CM-3", "DE.CM-7", "ID.SC-4", "PR.AC-3", "PR.PT-1", "PR.PT-4", "RS.AN-1", "RS.AN-4"], "pcidss": ["Req-10.2.4", "Req-10.2.1"], "srg": ["SRG-OS-000037-GPOS-00015", "SRG-OS-000042-GPOS-00020", "SRG-OS-000062-GPOS-00031", "SRG-OS-000392-GPOS-00172", "SRG-OS-000462-GPOS-00206", "SRG-OS-000471-GPOS-00215", "SRG-OS-000064-GPOS-00033", "SRG-OS-000458-GPOS-00203", "SRG-OS-000461-GPOS-00205", "SRG-APP-000495-CTR-001235"], "anssi": ["R73"], "cis": ["6.3.3.7"], "ism": ["0582", "0846"], "stigid": ["UBTU-22-654165"], "stigref": ["SV-260635r958446_rule"]}, "control_references": {"anssi": ["R73"], "cis": ["6.3.3.7"], "ism": ["0582", "0846"], "stigid": ["UBTU-22-654165"]}, "components": [], "identifiers": {}, "ocil_clause": "the command does not return a line, or the line is commented out", "ocil": "Verify Ubuntu 22.04 generates an audit record for unsuccessful attempts to use the ftruncate system call.\n\nIf the auditd daemon is configured to use the \"augenrules\" program to to read audit rules during daemon startup (the default), run the following command:\n\n$ sudo grep -r ftruncate /etc/audit/rules.d\n\nIf the auditd daemon is configured to use the \"auditctl\" utility to read audit rules during daemon startup, run the following command:\n\n$ sudo grep ftruncate /etc/audit/audit.rules\n\nThe output should be the following:\n\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access", "oval_external_content": null, "fixtext": "Configure the audit system to generate an audit event for any successful/unsuccessful use of the \"ftruncate\" system call by adding or updating the following rules in \"/etc/audit/audit.rules\" and adding the following rules to \"/etc/audit/rules.d/access.rules\" or updating the existing rules in files in the \"/etc/audit/rules.d/\" directory:\n\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k access\n\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k access\n\n\nIt's allowed to group this system call within the same line as creat, truncate, open, openat and open_by_handle_at.\n\nThe audit daemon must be restarted for the changes to take effect.", "checktext": "", "vuldiscussion": "", "srg_requirement": "Unsuccessful uses of the ftruncate system call in Ubuntu 22.04 must generate an audit record.", "warnings": [{"general": "Note that these rules can be configured in a\nnumber of ways while still achieving the desired effect. Here the system calls\nhave been placed independent of other system calls. Grouping these system\ncalls with others as identifying earlier in this guide is more efficient."}], "conflicts": [], "requires": [], "policy_specific_content": {"stig": {"srg_requirement": "Successful/unsuccessful uses of the ftruncate system call in Ubuntu 22.04 must generate an audit record.", "vuldiscussion": "Unsuccessful attempts to access files could be an indicator of malicious activity on a system. Auditing\nthese events could serve as evidence of potential system compromise.", "checktext": "To determine if the system is configured to audit calls to the\n ftruncate  system call, run the following command:\n $ sudo grep \"ftruncate\" /etc/audit/audit.*\nIf the system is configured to audit this activity, it will return a line.\n\n\nIf no line is returned, then this is a finding.", "fixtext": "Configure the audit system to generate an audit event for any successful/unsuccessful use of the \"ftruncate\" system call by adding or updating the following rules in the \"/etc/audit/rules.d/audit.rules\" file:\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k perm_access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -k perm_access\n\n-a always,exit -F arch=b32 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k perm_access\n-a always,exit -F arch=b64 -S ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -k perm_access\n\nIt's allowed to group this system call within the same line as \"creat\", \"ftruncate\", \"truncate\", \"open\", \"openat\" and \"open_by_handle_at\".\n\nThe audit daemon must be restarted for the changes to take effect."}}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": ["package[audit]", "system_with_kernel"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["package_audit", "system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Record Unsuccessful Access Attempts to Files - ftruncate", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/auditing/auditd_configure_rules/audit_file_modification/audit_rules_unsuccessful_file_modification_ftruncate/rule.yml", "template": {"name": "audit_rules_unsuccessful_file_modification", "vars": {"name": "ftruncate", "syscall_grouping": ["creat", "ftruncate", "truncate", "open", "openat", "open_by_handle_at"]}, "backends": {}}}