cis-ubuntu1204-v110-8-2-6

name	cis-ubuntu1204-v110-8-2-6
description	Accept Remote rsyslog Messages Only on Designated Log Hosts
category	cis-os-hardening
version	1.1.0
author	cyberstrike-official
tags	["cis","ubuntu",12.04,"linux","logging","rsyslog","remote-logging","log-host","tcp"]
cis_id	8.2.6
cis_benchmark	CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

8.2.6 Accept Remote rsyslog Messages Only on Designated Log Hosts (Not Scored)

Profile Applicability

• Level 1

Description

By default, rsyslog does not listen for log messages coming in from remote systems. The ModLoad tells rsyslog to load the imtcp.so module so it can listen over a network via TCP. The InputTCPServerRun option instructs rsyslogd to listen on the specified TCP port.

Rationale

The guidance in the section ensures that remote log hosts are configured to only accept rsyslog data from hosts within the specified domain and that those systems that are not designed to be log hosts do not accept any remote rsyslog messages. This provides protection from spoofed log data and ensures that system administrators are reviewing reasonably complete syslog data in a central location.

Audit Procedure

Using Command Line

grep '$ModLoad imtcp.so' /etc/rsyslog.conf
grep '$InputTCPServerRun' /etc/rsyslog.conf

Expected Result

$ModLoad imtcp.so
$InputTCPServerRun 514

Remediation

Using Command Line

For hosts that are designated as log hosts, edit the /etc/rsyslog.conf file and uncomment the following lines:

$ModLoad imtcp.so
$InputTCPServerRun 514

Execute the following command to restart rsyslogd:

pkill -HUP rsyslogd

Default Value

By default, rsyslog does not accept remote messages.

References

• CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
• See the rsyslog(8) man page for more information.

Profile

Level 1 - Not Scored