File systems that are being imported via Network File System (NFS) must be mounted to prevent binary files from being executed.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-73161	RHEL-07-021021	SV-87813r1_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 unprivileged users to attain unauthorized administrative access.

STIG	Date
Red Hat Enterprise Linux 7 Security Technical Implementation Guide	2017-12-14

Details

Check Text ( C-73285r1_chk )
Verify file systems that are being NFS exported are mounted with the "noexec" option. Find the file system(s) that contain the directories being exported with the following command: # more /etc/fstab \| grep nfs UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,noexec 0 0 If a file system found in "/etc/fstab" refers to NFS and it does not have the "noexec" option set, and use of NFS exported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Check Text ( C-73285r1_chk )

Verify file systems that are being NFS exported are mounted with the "noexec" option.

Find the file system(s) that contain the directories being exported with the following command:

# more /etc/fstab | grep nfs

UUID=e06097bb-cfcd-437b-9e4d-a691f5662a7d /store nfs rw,noexec 0 0

If a file system found in "/etc/fstab" refers to NFS and it does not have the "noexec" option set, and use of NFS exported binaries is not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-79607r1_fix)
Configure the "/etc/fstab" to use the "noexec" option on file systems that are being exported via NFS.