{"description": "The <tt>noexec</tt> mount option prevents the direct execution of binaries\non the mounted filesystem. Preventing the direct execution of binaries from\nremovable media (such as a USB key) provides a defense against malicious\nsoftware that may be present on such untrusted media.\nAdd the <code>noexec</code> option to the fourth column of\n<tt>/etc/fstab</tt> for the line which controls mounting of\n\n    any removable media partitions.", "rationale": "Allowing users to execute binaries from removable media such as USB keys exposes\nthe system to potential compromise.", "severity": "medium", "references": {"cis-csc": ["11", "12", "13", "14", "16", "3", "8", "9"], "cobit5": ["APO13.01", "BAI10.01", "BAI10.02", "BAI10.03", "BAI10.05", "DSS01.04", "DSS05.02", "DSS05.03", "DSS05.04", "DSS05.05", "DSS05.06", "DSS05.07", "DSS06.03", "DSS06.06"], "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", "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.11.2.6", "A.11.2.9", "A.12.1.2", "A.12.5.1", "A.12.6.2", "A.13.1.1", "A.13.2.1", "A.14.2.2", "A.14.2.3", "A.14.2.4", "A.6.2.1", "A.6.2.2", "A.7.1.1", "A.8.2.1", "A.8.2.2", "A.8.2.3", "A.8.3.1", "A.8.3.3", "A.9.1.2", "A.9.2.1"], "nerc-cip": ["CIP-003-8 R5.1.1", "CIP-003-8 R5.3", "CIP-004-6 R2.3", "CIP-007-3 R2.1", "CIP-007-3 R2.2", "CIP-007-3 R2.3", "CIP-007-3 R5.1", "CIP-007-3 R5.1.1", "CIP-007-3 R5.1.2"], "nist": ["CM-7(a)", "CM-7(b)", "CM-6(a)", "AC-6", "AC-6(1)", "MP-7"], "nist-csf": ["PR.AC-3", "PR.AC-6", "PR.IP-1", "PR.PT-2", "PR.PT-3"], "srg": ["SRG-OS-000480-GPOS-00227"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "removable media partitions are present", "ocil": "To verify that binaries cannot be directly executed from removable media, run the following command:\n<pre>$ grep -v noexec /etc/fstab</pre>\nThe resulting output will show partitions which do not have the <tt>noexec</tt> flag. Verify all partitions\nin the output are not removable media.", "oval_external_content": null, "fixtext": "Configure the \"/etc/fstab\" to use the \"noexec\" option on file systems that are associated with removable media.", "checktext": "", "vuldiscussion": "", "srg_requirement": "Ubuntu 22.04 must prevent code from being executed on file systems that are used with removable media.", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {"stig": {"srg_requirement": "Ubuntu 22.04 must prevent code from being executed on file systems that are used with removable media.", "vuldiscussion": "The \"noexec\" mount option causes the system not to execute binary files. This option must be used for mounting any file system not containing approved binary files, as they may be incompatible. Executing files from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access.", "checktext": "Verify file systems that are used for removable media are mounted with the \"noexec\" option with the following command:\n\n$ more /etc/fstab\n\nUUID=2bc871e4-e2a3-4f29-9ece-3be60c835222 /mnt/usbflash vfat noauto,owner,ro,nosuid,nodev,noexec 0 0\n\nIf a file system found in \"/etc/fstab\" refers to removable media and it does not have the \"noexec\" option set, this is a finding.", "fixtext": "Configure the \"/etc/fstab\" to use the \"noexec\" option on file systems that are associated with removable media."}}, "platform": null, "platforms": [], "sce_metadata": {}, "inherited_platforms": ["not container"], "cpe_platform_names": [], "inherited_cpe_platform_names": ["not_container"], "bash_conditional": null, "fixes": {}, "title": "Add noexec Option to Removable Media Partitions", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/system/permissions/partitions/mount_option_noexec_removable_partitions/rule.yml", "template": {"name": "mount_option_removable_partitions", "vars": {"mountoption": "noexec"}, "backends": {"anaconda": "off"}}}