cis-ubuntu1204-v110-6-7

name	cis-ubuntu1204-v110-6-7
description	Ensure NFS and RPC are not enabled
category	cis-os-hardening
version	1.1.0
author	cyberstrike-official
tags	["cis","ubuntu",12.04,"linux","nfs","rpc","network-filesystem","attack-surface"]
cis_id	6.7
cis_benchmark	CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

6.7 Ensure NFS and RPC are not enabled (Not Scored)

Profile Applicability

• Level 1

Description

The Network File System (NFS) is one of the first and most widely distributed file systems in the UNIX environment. It provides the ability for systems to mount file systems of other servers through the network.

Rationale

If the server does not export NFS shares or act as an NFS client, it is recommended that these services be disabled to reduce remote attack surface.

Audit Procedure

Using Command Line

Ensure no start conditions listed for rpcbind-boot:

initctl show-config rpcbind-boot rpcbind-boot

Run the following to ensure no start links for nfs-kernel-server exist in /etc/rc*.d:

ls /etc/rc*.d/S*nfs-kernel-server

Expected Result

No start conditions should be listed for rpcbind-boot and no results should be returned for nfs-kernel-server start links.

Remediation

Using Command Line

Remove or comment out start lines in /etc/init/rpcbind-boot.conf:

sed -i 's/^start/#start/' /etc/init/rpcbind-boot.conf

Remove any start links for nfs-kernel-server from /etc/rc*.d:

rm /etc/rc*.d/S*nfs-kernel-server

Default Value

rpcbind is enabled by default on Ubuntu 12.04 LTS Server. nfs-kernel-server is not installed by default.

References

• CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 1 - Not Scored