cis-apache24-11-1

name	cis-apache24-11.1
description	Ensure SELinux Is Enabled in Enforcing Mode (Automated)
category	cis-apache
version	2.3.0
author	cyberstrike-official
tags	["cis","apache","linux","selinux","mac","mandatory-access-control"]
cis_id	11.1
cis_benchmark	CIS Apache HTTP Server 2.4 Benchmark v2.3.0
tech_stack	["linux","apache"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

Ensure SELinux Is Enabled in Enforcing Mode (Automated)

Profile Applicability

• Level 2

Description

SELinux (Security-Enhanced Linux) is a Linux kernel security module that provides mandatory access control security policies with type enforcement that are checked after the traditional discretionary access controls. It was created by the US National Security Agency and can enforce rules on files and processes in a Linux system, and restrict actions, based on defined policies.

Rationale

Web applications and services continue to be one of the leading attack vectors for black-hat criminals to gain access to information and servers. The threat is high because web servers are often externally accessible and typically have the greatest share of server-side vulnerabilities. The SELinux mandatory access controls provide a much stronger security model which can be used to implement a deny-by-default model which only allows what is explicitly permitted.

Audit

Perform the following steps to determine if the recommended state is implemented:

Use the sestatus command to check that SELinux is enabled and that both the current mode and the configured mode are set to enforcing.

$ sestatus | grep -i mode
Current mode: enforcing
Mode from config file: enforcing

Remediation

Perform the following to implement the recommended state:

If SELinux is not enabled in the configuration file, edit the file /etc/selinux/config and set the value of SELINUX as enforcing and reboot the system for the new configuration to be effective.

SELINUX=enforcing

If the current mode is not enforcing, and an immediate reboot is not possible, the current mode can be set to enforcing with the setenable command shown below.

# setenforce 1

Default Value

SELinux is not enabled by default.

References

1. https://en.wikipedia.org/wiki/Security-Enhanced_Linux
2. https://www.redhat.com/en/topics/linux/what-is-selinux

CIS Controls

v8:

• 3.3 Configure Data Access Control Lists
  • Configure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications.