{"description": "Ensure that unsuccessful attempts to modify a file are audited.\n\nThe following rules configure audit as described above:\n<pre>## Unsuccessful file modifications (open for write or truncate)\n-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S open -F a1&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S open -F a1&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification    </pre>\n\nLoad new Audit rules into kernel by running:\n<pre>augenrules --load</pre>\n\nNote: This rule uses a special set of Audit rules to comply with OSPP 4.2.1. You may reuse this rule in different profiles. If you decide to do so, it is recommended that you inspect contents of the file closely and make sure that they are aligned with your needs.", "rationale": "Unsuccessful file modifications might be a sign of a malicious action being performed on the system. Auditing of such events helps in detection and investigation of such actions.", "severity": "medium", "references": {"nist": ["AU-2(a)"], "ospp": ["FAU_GEN.1.1.c"], "srg": ["SRG-OS-000458-GPOS-00203", "SRG-OS-000474-GPOS-00219", "SRG-OS-000475-GPOS-00220", "SRG-OS-000463-GPOS-00207", "SRG-OS-000465-GPOS-00209", "SRG-OS-000461-GPOS-00205"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "the file does not exist or the content differs", "ocil": "To verify that the <tt>Audit</tt> is correctly configured according to recommended rules, check the content of the file with the following command:\n<pre>cat /etc/audit/rules.d/30-ospp-v42-2-modify-failed.rules</pre>\nThe output has to be exactly as follows:\n<pre>## Unsuccessful file modifications (open for write or truncate)\n-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S open -F a1&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S open -F a1&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification    </pre>", "oval_external_content": null, "fixtext": "", "checktext": "", "vuldiscussion": "", "srg_requirement": "", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {}, "platform": null, "platforms": ["aarch64_arch"], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": ["aarch64_arch"], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Configure auditing of unsuccessful file modifications (AARch64)", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/auditing/policy_rules/audit_modify_failed_aarch64/rule.yml", "template": {"name": "audit_file_contents", "vars": {"filepath": "/etc/audit/rules.d/30-ospp-v42-2-modify-failed.rules", "contents": "## Unsuccessful file modifications (open for write or truncate)\n-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S open -F a1&amp;01003 -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S truncate,ftruncate -F exit=-EACCES -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S openat,open_by_handle_at -F a2&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S open -F a1&amp;01003 -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b32 -S truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification\n-a always,exit -F arch=b64 -S truncate,ftruncate -F exit=-EPERM -F auid>=1000 -F auid!=unset -F key=unsuccessful-modification"}, "backends": {}}}