cis-gcp-cos-6-2-10

name	cis-gcp-cos-6.2.10
description	Ensure users' dot files are not group or world writable
category	cis-gcp-cos
version	1.2.0
author	cyberstrike-official
tags	["cis","gcp","container-optimized-os","user-accounts","dot-files"]
cis_id	6.2.10
cis_benchmark	CIS Google Container-Optimized OS Benchmark v1.2.0
tech_stack	["gcp","linux"]
cwe_ids	[]
chains_with	[]
prerequisites	[]
severity_boost	{}

6.2.10 Ensure users' dot files are not group or world writable (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

Run the following script and verify no results are returned:

#!/bin/bash

grep -E -v '^(halt|sync|shutdown)' /etc/passwd | awk -F: '($7 != "'"$(which nologin)"'" && $7 != "/bin/false") { print $1 " " $6 }' | while read user dir; do
  if [ ! -d "$dir" ]; then
    echo "The home directory ($dir) of user $user does not exist."
  else
    for file in $dir/.[A-Za-z0-9]*; do
      if [ ! -h "$file" -a -f "$file" ]; then
        fileperm=$(ls -ld $file | cut -f1 -d" ")

        if [ $(echo $fileperm | cut -c6)  != "-" ]; then
          echo "Group Write permission set on file $file"
        fi
         [ $(  |  -c9)  !=  ];