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RHEL-09-231050 RHEL 9 must prevent files with the setuid and setgid bit set from being executed on file systems that contain user home directories.

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 file systems that contain user home directories.

Control

Verify "/home" is mounted with the "nosuid" option with the following command: Note: If a separate file system has not been created for the user home directories (user home directories are mounted under "/"), this is automatically a finding, as the "nosuid" option cannot be used on the "/" system. $ mount | grep /home tmpfs on /home type xfs (rw,nodev,nosuid,noexec,seclabel) If the "/home" file system is mounted without the "nosuid" option, this is a finding.

Discussion

The "nosuid" mount option causes the system to not 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 "/home" directory.