| name | cis-ubuntu1604-v200-4-2-1-6 |
| description | Ensure remote rsyslog messages are only accepted on designated log hosts |
| category | cis-logging |
| version | 2.0.0 |
| author | cyberstrike-official |
| tags | ["cis","ubuntu","linux","ubuntu-16.04","logging","rsyslog"] |
| cis_id | 4.2.1.6 |
| 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 4.2.1.6
Profile
- Level: 1 - Server
- Level: 1 - Workstation
- Assessment Status: Manual
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.
Note: The $ModLoad imtcp line can have the .so extension added to the end of the module, or use the full path to the module.
Impact
None.
Audit Procedure
Run the following commands and verify the resulting lines are:
- Not commented on designated log hosts
- Commented or not present on all others
Command Line
Run the following command and verify the output for $ModLoad imtcp:
grep '$ModLoad imtcp' /etc/rsyslog.conf /etc/rsyslog.d/*.conf
Output for designated log hosts:
$ModLoad imtcp
Output for systems that are not log hosts: (No output is also acceptable)
# $ModLoad imtcp
Run the following command and verify the output for $InputTCPServerRun:
grep '$InputTCPServerRun' /etc/rsyslog.conf /etc/rsyslog.d/*.conf
Output for designated log hosts:
$InputTCPServerRun 514
Output for systems that are not log hosts: (No output is also acceptable)
# $InputTCPServerRun 514
