User Initialization Files Must Not Run World-Writable Programs
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Description
Set the mode on files being executed by the user initialization files with the
following command:
Rationale
If user start-up files execute world-writable programs, especially in
unprotected directories, they could be maliciously modified to destroy user
files or otherwise compromise the system at the user level. If the system is
compromised at the user level, it is easier to elevate privileges to eventually
compromise the system at the root and network level.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
readarray -t world_writable_files < <(find / -xdev -type f -perm -0002 2> /dev/null)
readarray -t interactive_home_dirs < <(awk -F':' '{ if ($3 >= 1000 && $3 != 65534) print $6 }' /etc/passwd)
for world_writable in "${world_writable_files[@]}"; do
for homedir in "${interactive_home_dirs[@]}"; do
if grep -q -d skip "$world_writable" "$homedir"/.*; then
chmod o-w $world_writable
break
fi
done
done
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: User Initialization Files Must Not Run World-Writable Programs - Initialize
variables
set_fact:
home_user_dirs: []
world_writable_files: []
tags:
- accounts_user_dot_no_world_writable_programs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: User Initialization Files Must Not Run World-Writable Programs - Get user's
home dir list
ansible.builtin.getent:
database: passwd
register: passwd_database
tags:
- accounts_user_dot_no_world_writable_programs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: User Initialization Files Must Not Run World-Writable Programs - Fill home_user_dirs
set_fact:
home_user_dirs: '{{ home_user_dirs + [item.data[4]] }}'
when: item.data[4] is defined and item.data[2]|int >= 1000 and item.data[2]|int
!= 65534
with_items: '{{ passwd_database.ansible_facts.getent_passwd | dict2items(key_name=''user'',
value_name=''data'')}}'
tags:
- accounts_user_dot_no_world_writable_programs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: User Initialization Files Must Not Run World-Writable Programs - Get world
writable files
ansible.builtin.shell: |
find / -xdev -type f -perm -0002 2> /dev/null
register: world_writable_files
tags:
- accounts_user_dot_no_world_writable_programs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: User Initialization Files Must Not Run World-Writable Programs - Find referenced_files
in init files
ansible.builtin.find:
paths: '{{ home_user_dirs }}'
contains: '{{ item }}'
hidden: true
read_whole_file: true
recurse: true
with_items: '{{ world_writable_files.stdout_lines }}'
register: referenced_files
tags:
- accounts_user_dot_no_world_writable_programs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: User Initialization Files Must Not Run World-Writable Programs - Remove world
writable permissions
ansible.builtin.file:
path: '{{ item.item }}'
mode: o-w
when: item.matched > 0
with_items: '{{ referenced_files.results }}'
tags:
- accounts_user_dot_no_world_writable_programs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
