Cis Gcp Cos 6.1.7

---
name: cis-gcp-cos-6.1.7
description: "Ensure permissions on /etc/group- are configured"
category: cis-gcp-cos
version: "1.2.0"
author: cyberstrike-official
tags: [cis, gcp, container-optimized-os, file-permissions, group, system-files]
cis_id: "6.1.7"
cis_benchmark: "CIS Google Container-Optimized OS Benchmark v1.2.0"
tech_stack: [gcp, linux]
cwe_ids: []
chains_with: []
prerequisites: []
severity_boost: {}
---

# 6.1.7 Ensure permissions on /etc/group- are configured (Automated)

## Description

The `/etc/group-` file contains a backup list of all the valid groups defined in the system.

## Rationale

It is critical to ensure that the `/etc/group-` file is protected from unauthorized access. Although it is protected by default, the file permissions could be changed either inadvertently or through malicious actions.

## Audit Procedure

Run the following command and verify `Uid` and `Gid` are both `0/root` and `Access` is `644` or more restrictive:

```bash
# stat /etc/group-
Access: (0644/-rw-------)  Uid: (    0/    root)   Gid: (    0/    root)
```

## Expected Result

`Uid` and `Gid` should both be `0/root` and `Access` should be `644` or more restrictive.

## Remediation

Run the following command to set permissions on `/etc/group-`:

```bash
# chown root:root /etc/group-
# chmod u-x,go-wx /etc/group-
```

## CIS Controls

| Controls Version | Control                                             | IG 1 | IG 2 | IG 3 |
| ---------------- | --------------------------------------------------- | ---- | ---- | ---- |
| v8               | 3.3 Configure Data Access Control Lists             | x    | x    | x    |
| v7               | 16.4 Encrypt or Hash all Authentication Credentials |      | x    | x    |

## Profile

- Level 1 - Server