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RHEL 9 must mount /dev/shm with the noexec option.
Overview
| Finding ID | Version | Rule ID | IA Controls | Severity |
|---|---|---|---|---|
| V-257864 | RHEL-09-231115 | SV-257864r958804_rule | Medium |
| Description |
|---|
| The "noexec" mount option causes the system to not execute binary files. This option must be used for mounting any file system not containing approved binary files, as they may be incompatible. Executing files from untrusted file systems increases the opportunity for nonprivileged users to attain unauthorized administrative access. |
| STIG | Date |
|---|---|
| Red Hat Enterprise Linux 9 Security Technical Implementation Guide | 2024-06-04 |
Details
| Check Text ( C-61605r925577_chk ) |
|---|
| Verify "/dev/shm" is mounted with the "noexec" 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 "noexec" option, this is a finding. |
| Fix Text (F-61529r925578_fix) |
|---|
| Modify "/etc/fstab" to use the "noexec" option on the "/dev/shm" file system. |