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

DevOps & Security

Ensure audit log storage size 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-v200-4-1-2-1/SKILL.md

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CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 4.1.2.1

Profile

Level: 2 - Server
Level: 2 - Workstation
Assessment Status: Automated

Description

Configure the maximum size of the audit log file. Once the log reaches the maximum size, it will be rotated and a new log file will be started.

Notes:

The max_log_file parameter is measured in megabytes
Other methods of log rotation may be appropriate based on site policy. One example is time-based rotation strategies which don't have native support in auditd configurations
Manual audit of custom configurations should be evaluated for effectiveness and completeness

Rationale

It is important that an appropriate size is determined for log files so that they do not impact the system and audit data is not lost.

Impact

None.

Audit Procedure

Command Line

Run the following command and ensure output is in compliance with site policy:

grep max_log_file /etc/audit/auditd.conf

Expected Result

max_log_file = <MB>

The value should be set in accordance with site policy.

Remediation

Command Line

Set the following parameter in /etc/audit/auditd.conf in accordance with site policy:

max_log_file = <MB>

Default Value

The default max_log_file is 8 MB.

References

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Section 4.1.2.1

CIS Controls

Controls Version	Control
v7	6.4 Ensure adequate storage for logs - Ensure that all systems that store logs have adequate storage space for the logs generated.