cis-ubuntu1204-v110-13-3

name	cis-ubuntu1204-v110-13-3
description	Verify No Legacy "+" Entries Exist in /etc/shadow File
category	cis-os-hardening
version	1.1.0
author	cyberstrike-official
tags	["cis","ubuntu",12.04,"linux","user-management","shadow","nis","legacy"]
cis_id	13.3
cis_benchmark	CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

13.3 Verify No Legacy "+" Entries Exist in /etc/shadow File (Scored)

Profile Applicability

• Level 1

Description

The character + in various files used to be markers for systems to insert data from NIS maps at a certain point in a system configuration file. These entries are no longer required on most systems, but may exist in files that have been imported from other platforms.

Rationale

These entries may provide an avenue for attackers to gain privileged access on the system.

Audit Procedure

Using Command Line

Run the following command and verify that no output is returned:

/bin/grep '^+:' /etc/shadow

Expected Result

No output should be returned. Any output indicates legacy + entries exist in /etc/shadow.

Remediation

Using Command Line

Delete these entries if they exist.

Default Value

No legacy + entries exist in /etc/shadow by default on Ubuntu 12.04.

References

• CIS Ubuntu 12.04 LTS Server Benchmark v1.1.0

Profile

Level 1 - Scored