cis-ubuntu1604-v200-6-2-7

name	cis-ubuntu1604-v200-6-2-7
description	Ensure users' dot files are not group or world writable
category	cis-iam
version	2.0.0
author	cyberstrike-official
tags	["cis","ubuntu","linux","ubuntu-16.04","user-management","maintenance"]
cis_id	6.2.7
cis_benchmark	CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0
tech_stack	["ubuntu","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

CIS Ubuntu Linux 16.04 LTS Benchmark v2.0.0 - Control 6.2.7

Profile

• Level: 1 - Server
• Level: 1 - Workstation
• Assessment Status: Automated

Description

While the system administrator can establish secure permissions for users' "dot" files, the users can easily override these.

Rationale

Group or world-writable user configuration files may enable malicious users to steal or modify other users' data or to gain another user's system privileges.

Audit Procedure

Command Line

Run the following script and verify no results are returned:

#!/bin/bash
awk -F: '($1!~/(halt|sync|shutdown)/ && $7!~/^(\/usr)?\/sbin\/nologin(\/)?\$/
&& $7!~/(\/usr)?\/bin\/false(\/)?\$/) { print $1 " " $6 }' /etc/passwd | while
read -r user dir; do
  if [ -d "$dir" ]; then
    for file in "$dir"/.*; do
      if [ ! -h "$file" ] && [ -f "$file" ]; then
        fileperm=$(stat -L -c "%A" "$file")
        if [ "$(echo "$fileperm" | cut -c6)" != "-" ] || [ "$(echo
"$fileperm" | cut -c9)" != "-" ]; then
          echo "User: \"\" file: \"\" has permissions:
\"\""