cis-ubuntu1804-v220-5-2-4-8

name	cis-ubuntu1804-v220-5-2-4-8
description	null
version	2.2.0
category	cis-logging
tags	["cis","ubuntu","linux","ubuntu-18.04","auditing","auditd"]
author	CIS Benchmarks
target	{"platform":"linux","version":"18.04"}
severity_boost	{}

5.2.4.8 Ensure audit tools are 755 or more restrictive

Description

Audit tools include, but are not limited to, vendor-provided and open source audit tools needed to successfully view and manipulate audit information system activity and records. Audit tools include custom queries and report generators.

Rationale

Protecting audit information includes identifying and protecting the tools used to view and manipulate log data. Protecting audit tools is necessary to prevent unauthorized operation on audit information.

Audit

Run the following command to verify the audit tools have mode 755 or more restrictive, are owned by the root user and group root:

stat -Lc "%n %a" /sbin/auditctl /sbin/aureport /sbin/ausearch /sbin/autrace /sbin/auditd /sbin/augenrules | grep -Pv -- '^\h*\H+\h+([0-7][0,1,4,5][0,1,4,5])\h*$'

Expected result: Nothing should be returned

Remediation

Run the following command to remove more permissive mode from the audit tools:

chmod go-w /sbin/auditctl /sbin/aureport /sbin/ausearch /sbin/autrace /sbin/auditd /sbin/augenrules

References

1. NIST SP 800-53 Rev. 5: AU-3

Metadata

• Profile Applicability: Level 2 - Server, Level 2 - Workstation
• Category: cis-logging
• Tags: cis, ubuntu, linux, ubuntu-18.04, auditing, auditd
• Version: 2.2.0
• Severity Boost: {}
• Automated: Yes
• CIS Controls:
  • v8: 3.3 Configure Data Access Control Lists
  • v7: 14.6 Protect Information through Access Control Lists
• MITRE ATT&CK:
  • Tactics: TA0007 (Discovery)
  • Techniques: T1070, T1070.002, T1083, T1083.000
  • Mitigations: M1047 (Audit)