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RHEL-10-700195 RHEL 10 must mount "/var/tmp" with the "nosuid" option.

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

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

Title

RHEL 10 must mount "/var/tmp" with the "nosuid" option.

Control

Verify RHEL 10 is configured so that "/var/tmp" is mounted with the "nosuid" option: $ mount | grep /var/tmp /dev/mapper/luks-c98555c8-0462-4b97-9afa-6db8c4bfee3b on /var/tmp type xfs (rw,nosuid,nodev,noexec,relatime,seclabel,attr2) If the "/var/tmp" 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.

Related controls

CCI-001764

Fix

Configure RHEL 10 to mount "/var/tmp" with the "nosuid" option. Modify "/etc/fstab" to use the "nosuid" option on the "/var/tmp" 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 /var/tmp