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V-271649

CAT II (Medium)

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

Rule ID

SV-271649r1208728_rule

STIG

Oracle Linux 9 Security Technical Implementation Guide

Version

V1R6

CCIs

CCI-001764

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.

Check Content

Note: For systems that use BIOS, this is not applicable.

Verify OL 9 "/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.

Fix Text

Configure OL 9 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.