cis-ubuntu1604-v200-4-2-1-4

name	cis-ubuntu1604-v200-4-2-1-4
description	Ensure rsyslog default file permissions configured
category	cis-logging
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","logging","rsyslog"]
cis_id	4.2.1.4
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 4.2.1.4

Profile

• Level: 1 - Server
• Level: 1 - Workstation
• Assessment Status: Automated

Description

rsyslog will create logfiles that do not already exist on the system. This setting controls what permissions will be applied to these newly created files.

Rationale

It is important to ensure that log files have the correct permissions to ensure that sensitive data is archived and protected.

Impact

None.

Audit Procedure

Run the following command and verify that every instance of $FileCreateMode is 0640 or more restrictive:

Command Line

grep ^\s*\$FileCreateMode /etc/rsyslog.conf /etc/rsyslog.d/*.conf

Expected Result

If $FileCreateMode is not found, the default value 0644 is used and at least one $FileCreateMode has to be added.

Remediation

Edit the /etc/rsyslog.conf and /etc/rsyslog.d/*.conf files and set every instance of $FileCreateMode to 0640 or more restrictive:

Command Line

# Add or update the following line in /etc/rsyslog.conf or /etc/rsyslog.d/*.conf:
$FileCreateMode 0640

Default Value

The default value for $FileCreateMode is 0644 if not explicitly set.

References

1. See the rsyslog.conf(5) man page for more information.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v7	5.1 Establish Secure Configurations Maintain documented, standard security configuration standards for all authorized operating systems and software.