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CIS Ubuntu 14.04 LTS - 4.1.1.3 Ensure audit logs are not automatically deleted

DevOps & Security
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Configure auditd to retain all audit logs by setting max_log_file_action to keep_logs

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4.1.1.3 Ensure audit logs are not automatically deleted (Scored)

Profile Applicability

  • Level 2 - Server
  • Level 2 - Workstation

Description

The max_log_file_action setting determines how to handle the audit log file reaching the max file size. A value of keep_logs will rotate the logs but never delete old logs.

Rationale

In high security contexts, the benefits of maintaining a long audit history exceed the cost of storing the audit history.

Audit Procedure

Run the following command and verify output matches:

grep max_log_file_action /etc/audit/auditd.conf

Expected Result

max_log_file_action = keep_logs

Remediation

Set the following parameter in /etc/audit/auditd.conf:

max_log_file_action = keep_logs

Default Value

Not configured to keep_logs by default.

References

  1. CIS Controls v6.1 - 6.3 Ensure Audit Logging Systems Are Not Subject To Loss

Profile

  • Level 2 - Server
  • Level 2 - Workstation