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Check: RHEL-09-231120

RHEL 9 STIG: RHEL-09-231120 (in version v2 r3)

Title

RHEL 9 must mount /dev/shm with the nosuid option. (Cat II impact)

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.

Check Content

Verify "/dev/shm" is mounted with the "nosuid" option with the following command: $ mount | grep /dev/shm tmpfs on /dev/shm type tmpfs (rw,nodev,nosuid,noexec,seclabel) If the /dev/shm file system is mounted without the "nosuid" option, this is a finding.

Fix Text

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

Additional Identifiers

Rule ID: SV-257865r1044946_rule

Vulnerability ID: V-257865

Group Title: SRG-OS-000368-GPOS-00154

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CCIs

CCIs tied to check.

Number	Definition
CCI-001764	Prevent program execution in accordance with organization-defined policies, rules of behavior, and/or access agreements regarding software program usage and restrictions; rules authorizing the terms and conditions of software program usage.

Controls

Controls tied to check. These are derived from the CCIs shown above.

Number	Title
CM-7(2)	Prevent Program Execution