RHEL 8 must prevent files with the setuid and setgid bit set from being executed on file systems that are imported via Network File System (NFS).

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-230308	RHEL-08-010650	SV-230308r627750_rule		Medium

Description
The "nosuid" mount option causes the system not to 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.

STIG	Date
Red Hat Enterprise Linux 8 Security Technical Implementation Guide	2022-09-07

Details

Check Text ( C-32977r567670_chk )
Verify that file systems being imported via NFS are mounted with the "nosuid" option with the following command: $ sudo grep nfs /etc/fstab | grep nosuid UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,nosuid,nodev,noexec 0 0 If a file system found in "/etc/fstab" refers to NFS and it does not have the "nosuid" option set, this is a finding.

Fix Text (F-32952r567671_fix)
Configure the "/etc/fstab" to use the "nosuid" option on file systems that are being imported via NFS.