# Cis GCP Cos 4.1.3

> Ensure permissions on all logfiles are configured

- Skill: `cyberstrikeus/cis-gcp-cos-4-1-3` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/cis-gcp-cos-4-1-3`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/cis-gcp-cos-4-1-3/raw
- Safety review: CAUTION (external: skill-scanner FAIL, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: DevOps & Infra
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/cis-gcp-cos-4-1-3

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# 4.1.3 Ensure permissions on all logfiles are configured (Automated)

## Description

Log files stored in /var/log/ contain logged information from many services on the system, or on log hosts others as well.

## Rationale

It is important to ensure that log files have the correct permissions to ensure that sensitive data is archived and protected.

## Audit Procedure

Run the following command and verify that other has no permissions on any files and group does not have write or execute permissions on any files:

```bash
# find /var/log -type f -ls
```

## Expected Result

The output should show that no files have permissions allowing other users to read, write, or execute, and group does not have write or execute permissions.

## Remediation

Run the following commands to set permissions on all existing log files:

```bash
find /var/log -type f -exec chmod g-wx,o-rwx "{}" + -o -type d -exec chmod g-w,o-rwx "{}" +
```

## Default Value

You may also need to change the configuration for your logging software or services for any logs that had incorrect permissions.

## CIS Controls

| Controls Version | Control                                                                                                                                                                                                                                             | IG 1 | IG 2 | IG 3 |
| ---------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | ---- | ---- | ---- |
| v8               | **3.3 Configure Data Access Control Lists** - Configure data access control lists based on a user's need to know. Apply data access control lists, also known as access permissions, to local and remote file systems, databases, and applications. | x    | x    | x    |
| v7               | **5.1 Establish Secure Configurations** - Maintain documented, standard security configuration standards for all authorized operating systems and software.                                                                                         | x    | x    | x    |

## Profile

- Level 2 - Server