cis-gcp-cos-6-2-5

name	cis-gcp-cos-6.2.5
description	Ensure root is the only UID 0 account
category	cis-gcp-cos
version	1.2.0
author	cyberstrike-official
tags	["cis","gcp","container-optimized-os","user-accounts","duplicate-ids"]
cis_id	6.2.5
cis_benchmark	CIS Google Container-Optimized OS Benchmark v1.2.0
tech_stack	["gcp","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

6.2.5 Ensure root is the only UID 0 account (Automated)

Description

Any account with UID 0 has superuser privileges on the system.

Rationale

This access must be limited to only the default root account and only from the system console. Administrative access must be through an unprivileged account using an approved mechanism as noted in Item 5.6 Ensure access to the su command is restricted.

Audit Procedure

Run the following command and verify that only "root" is returned:

# awk -F: '($3 == 0) { print $1 }' /etc/passwd

root

Expected Result

Only "root" should be returned.

Remediation

Remove any users other than root with UID 0 or assign them a new UID if appropriate.

CIS Controls

Controls Version	Control	IG 1	IG 2	IG 3
v8	3.3 Configure Data Access Control Lists	x	x	x
v7	5.1 Establish Secure Configurations	x	x	x

Profile

• Level 1 - Server