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RHEL-09-231105 RHEL 9 must prevent files with the setuid and setgid bit set from being executed on the /boot/efi directory.

DISA STIG library V2R10
All changes in this version
first version loaded CAT II

Maps to CM-7(2) via CCI-001764

Title

RHEL 9 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, this is not applicable. Verify 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. Note: This control is not applicable to vfat file systems.

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. Satisfies: SRG-OS-000368-GPOS-00154, SRG-OS-000480-GPOS-00227

Related controls

CCI-001764

Fix

Modify "/etc/fstab" to use the "nosuid" option on the "/boot/efi" directory.