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RHEL-10-700130 RHEL 10 must prevent files with the "setuid" and "setgid" bit set from being executed on the "/boot/efi" directory.

DISA STIG library V1R3
All changes in this version
first version loaded CAT II

Maps to AC-3 via CCI-000213

Title

RHEL 10 must prevent files with the "setuid" and "setgid" bit set from being executed on the "/boot/efi" directory.

Control

Note: For systems that use BIOS and for vfat systems, this requirement is not applicable. Verify RHEL 10 is configured so that the "/boot/efi "directory is mounted with the "nosuid" option with the following command: $ mount | grep '\s/boot/efi\s' /dev/sda1 on /boot/efi type vfat (rw,nosuid,relatime,fmask=0077,dmask=0077,codepage=437,iocharset=ascii,shortname=winnt,errors=remount-ro) If the "/boot/efi" file system does not have the "nosuid" option set, this is a finding.

Discussion

The "nosuid" mount option causes the system not to execute "setuid" and "setgid" files with owner privileges. This option must be used for mounting any file system not containing approved "setuid" and "setguid" files. Executing files from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access.

Related controls

CCI-000213

Fix

Configure RHEL 10 to prevent files with the "setuid" and "setgid" bit set from being executed on the "/boot/efi" directory. Modify "/etc/fstab" to use the "nosuid" option on the "/boot/efi" directory. To reload all implicit mount units and update the dependency graph so that new options will apply correctly at next remount, run the following command: $ sudo systemctl daemon-reload Use the following command to apply the changes immediately without a reboot: $ sudo mount -o remount /boot/efi