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RHEL-09-231120 - RHEL 9 must mount /dev/shm with the nosuid option.

Information

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.

Solution

Configure "/dev/shm" to mount with the "nosuid" option.

Modify "/etc/fstab" to use the "nosuid" option on the "/dev/shm" file system.

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 /dev/shm

See Also

https://dl.dod.cyber.mil/wp-content/uploads/stigs/zip/U_RHEL_9_V2R8_STIG.zip

Item Details

Category: CONFIGURATION MANAGEMENT

References: 800-53|CM-7(2), CAT|II, CCI|CCI-001764, Rule-ID|SV-257865r1184297_rule, STIG-ID|RHEL-09-231120, Vuln-ID|V-257865

Plugin: Unix

Control ID: 1852952779c05a59a77147207c87bec7d5bba36e63224aa67e28a9d2602775b2