All Network File System (NFS) exported system files and system directories must be owned by root.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-931	GEN005800	SV-46121r1_rule		Medium

Description
Failure to give ownership of sensitive files or directories to root provides the designated owner and possible unauthorized users with the potential to access sensitive information or change system configuration which could weaken the system's security posture.

STIG	Date
SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide	2018-09-19

Details

Check Text ( C-43378r1_chk )
Check if the nfs-kernel-server package is installed. It contains the exportfs command as well as the nfsserver process itself. # rpm –q nfs-kernel-server If the package is not installed, this check does not apply. If it is installed, check for NFS exported file systems. Procedure: # cat /etc/exports For each file system displayed, check the ownership. # ls -lLa If the files and directories are not owned by root, this is a finding.

Check Text ( C-43378r1_chk )

Check if the nfs-kernel-server package is installed. It contains the exportfs command as well as the nfsserver process itself.

# rpm –q nfs-kernel-server
If the package is not installed, this check does not apply. If it is installed, check for NFS exported file systems.

Procedure:
# cat /etc/exports
For each file system displayed, check the ownership.

# ls -lLa

If the files and directories are not owned by root, this is a finding.

Fix Text (F-39462r1_fix)
Change the ownership of exported file systems not owned by root. Procedure: # chown root