From Red Hat Enterprise Linux 7 Security Technical Implementation Guide
Part of SRG-OS-000368-GPOS-00154
Associated with: CCI-001764
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 unprivileged users to attain unauthorized administrative access.
Verify that the "nosuid" option is configured for /dev/shm. Check that the operating system is configured to use the "nosuid" option for /dev/shm with the following command: # cat /etc/fstab | grep /dev/shm | grep nosuid tmpfs /dev/shm tmpfs defaults,nodev,nosuid,noexec 0 0 If the "nosuid" option is not present on the line for "/dev/shm", this is a finding. Verify "/dev/shm" is mounted with the "nosuid" option: # mount | grep "/dev/shm" | grep nosuid If no results are returned, this is a finding.
Configure the "/etc/fstab" to use the "nosuid" option for all lines containing "/dev/shm".
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