{"description": "Add the <code>nodev</code> option to the fourth column of <tt>/etc/fstab</tt> for the line which controls mounting of\nany NFS mounts.", "rationale": "Legitimate device files should only exist in the /dev directory. NFS mounts\nshould not present device files to users.", "severity": "medium", "references": {"cis-csc": ["11", "13", "14", "3", "8", "9"], "cobit5": ["APO13.01", "BAI10.01", "BAI10.02", "BAI10.03", "BAI10.05", "DSS05.02", "DSS05.05", "DSS05.06", "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.11.2.9", "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.8.2.1", "A.8.2.2", "A.8.2.3", "A.8.3.1", "A.8.3.3", "A.9.1.2"], "nist": ["CM-6(a)", "MP-2"], "nist-csf": ["PR.IP-1", "PR.PT-2", "PR.PT-3"], "srg": ["SRG-OS-000480-GPOS-00227"]}, "control_references": {}, "components": [], "identifiers": {}, "ocil_clause": "the setting does not show", "ocil": "To verify the <tt>nodev</tt> option is configured for all NFS mounts, run\nthe following command:\n<pre>$ mount | grep nfs</pre>\nAll NFS mounts should show the <tt>nodev</tt> setting in parentheses. This\nis not applicable if NFS is not implemented.", "oval_external_content": null, "fixtext": "Configure the \"/etc/fstab\" to use the \"nodev\" option on file systems that are being imported via NFS.", "checktext": "", "vuldiscussion": "", "srg_requirement": "Ubuntu 22.04 must prevent special devices on file systems that are imported via Network File System (NFS).", "warnings": [], "conflicts": [], "requires": [], "policy_specific_content": {"stig": {"srg_requirement": "Ubuntu 22.04 must prevent special devices on file systems that are imported via Network File System (NFS).", "vuldiscussion": "The \"nodev\" mount option causes the system to not interpret character or block special devices. Executing character or block special devices from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access.", "checktext": "Note: If no NFS mounts are configured, this requirement is Not Applicable.\n\nVerify Ubuntu 22.04 has the \"nodev\" option configured for all NFS mounts with the following command:\n\n$ grep nfs /etc/fstab\n\n192.168.22.2:/mnt/export /data nfs4 rw,nosuid,nodev,noexec,sync,soft,sec=krb5:krb5i:krb5p\n\nIf the system is mounting file systems via NFS and the \"nodev\" option is missing, this is a finding.", "fixtext": "Update each NFS mounted file system to use the \"nodev\" option on file systems that are being imported via NFS."}}, "platform": "nfs_mount_defined", "platforms": ["nfs_mount_defined"], "sce_metadata": {}, "inherited_platforms": ["system_with_kernel"], "cpe_platform_names": ["nfs_mount_defined"], "inherited_cpe_platform_names": ["system_with_kernel"], "bash_conditional": null, "fixes": {}, "title": "Mount Remote Filesystems with nodev", "definition_location": "/aptdata/openscap/scap-security-guide/linux_os/guide/services/nfs_and_rpc/nfs_configuring_clients/mounting_remote_filesystems/mount_option_nodev_remote_filesystems/rule.yml", "template": {"name": "mount_option_remote_filesystems", "vars": {"mount_has_to_exist": "yes", "mountoption": "nodev", "mountpoint": "remote_filesystems"}, "backends": {}}}