cis-ubuntu1204-v110-10-3

DevOps & Security

Set Default Group for root Account

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I want to install this Agent Skill for this project in Codex.

Source SKILL.md: https://github.com/CyberStrikeus/CyberStrike/blob/HEAD/.cyberstrike/skill/CIS_benchmarks/Operating_Systems/Ubuntu/CIS_Ubuntu_12.04_LTS_Server_Benchmark_v1.1.0/cis-ubuntu1204-v110-10-3/SKILL.md

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10.3 Set Default Group for root Account (Scored)

Profile Applicability

Level 1

Description

The usermod command can be used to specify which group the root user belongs to. This affects permissions of files that are created by the root user.

Rationale

Using GID 0 for the root account helps prevent root-owned files from accidentally becoming accessible to non-privileged users.

Audit Procedure

Using Command Line

grep "^root:" /etc/passwd | cut -f4 -d:

Expected Result

The command should return 0.

Remediation

Using Command Line

usermod -g 0 root

Default Value

GID 0 is the default group for root.

References

CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 1 - Scored