cis-ubuntu1604-v200-4-3

DevOps & Security

Ensure logrotate is configured

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Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_Linux_16.04_LTS_Benchmark_v2.0.0/cis-ubuntu1604-v200-4-3/SKILL.md

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CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 4.3

Profile

Level: 1 - Server
Level: 1 - Workstation
Assessment Status: Manual

Description

The system includes the capability of rotating log files regularly to avoid filling up the system with logs or making the logs unmanageably large. The file /etc/logrotate.d/rsyslog is the configuration file used to rotate log files created by rsyslog.

Note: If no maxage setting is set for logrotate a situation can occur where logrotate is interrupted and fails to delete rotated logfiles. It is recommended to set this to a value greater than the longest any log file should exist on your system to ensure that any such logfile is removed but standard rotation settings are not overridden.

Rationale

By keeping the log files smaller and more manageable, a system administrator can easily archive these files to another system and spend less time looking through inordinately large log files.

Impact

None.

Audit Procedure

Review /etc/logrotate.conf and /etc/logrotate.d/rsyslog and verify logs are rotated according to site policy.

Command Line

cat /etc/logrotate.conf
cat /etc/logrotate.d/rsyslog

Expected Result

The output should show log rotation configuration that aligns with site policy, including rotation frequency, retention count, and compression settings.

Remediation

Edit /etc/logrotate.conf and /etc/logrotate.d/rsyslog to ensure logs are rotated according to site policy.

Command Line

# Review and edit as needed:
vi /etc/logrotate.conf
vi /etc/logrotate.d/rsyslog

Default Value

logrotate is configured with default rotation settings on Ubuntu 16.04.

References

None.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v7	6.4 Ensure adequate storage for logsEnsure that all systems that store logs have adequate storage space for the logs generated.