Ensure All User Initialization Files Have Mode 0740 Or Less Permissive
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Description
Set the mode of the user initialization files to 0740
with the
following command:
$ sudo chmod 0740 /home/USER/.INIT_FILE
Rationale
Local initialization files are used to configure the user’s shell environment
upon logon. Malicious modification of these files could compromise accounts upon
logon.
Shell script
The following script can be run on the host to remediate the issue.
#!/bin/bash
var_user_initialization_files_regex='^\.[\w\- ]+$'
readarray -t interactive_users < <(awk -F: '$3>=1000 {print $1}' /etc/passwd)
readarray -t interactive_users_home < <(awk -F: '$3>=1000 {print $6}' /etc/passwd)
readarray -t interactive_users_shell < <(awk -F: '$3>=1000 {print $7}' /etc/passwd)
USERS_IGNORED_REGEX='nobody|nfsnobody'
for (( i=0; i<"${#interactive_users[@]}"; i++ )); do
if ! grep -qP "$USERS_IGNORED_REGEX" <<< "${interactive_users[$i]}" && \
[ "${interactive_users_shell[$i]}" != "/sbin/nologin" ]; then
readarray -t init_files < <(find "${interactive_users_home[$i]}" -maxdepth 1 \
-exec basename {} \; | grep -P "$var_user_initialization_files_regex")
for file in "${init_files[@]}"; do
chmod u-s,g-wxs,o= "${interactive_users_home[$i]}/$file"
done
fi
done
Ansible playbook
The following playbook can be run with Ansible to remediate the issue.
- name: XCCDF Value var_user_initialization_files_regex # promote to variable
set_fact:
var_user_initialization_files_regex: !!str ^\.[\w\- ]+$
tags:
- always
- name: Ensure All User Initialization Files Have Mode 0740 Or Less Permissive - Gather
User Info
ansible.builtin.getent:
database: passwd
tags:
- CCE-80525-9
- DISA-STIG-RHEL-07-020710
- file_permission_user_init_files
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Ensure All User Initialization Files Have Mode 0740 Or Less Permissive - Find
Init Files
ansible.builtin.find:
paths: '{{ item.value[4] }}'
pattern: '{{ var_user_initialization_files_regex }}'
hidden: true
use_regex: true
with_dict: '{{ ansible_facts.getent_passwd }}'
when:
- item.value[4] != "/sbin/nologin"
- item.key not in ["nobody", "nfsnobody"]
- item.value[1] | int >= 1000
register: found_init_files
tags:
- CCE-80525-9
- DISA-STIG-RHEL-07-020710
- file_permission_user_init_files
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy
- name: Ensure All User Initialization Files Have Mode 0740 Or Less Permissive - Fix
Init Files Permissions
ansible.builtin.file:
path: '{{ item.1.path }}'
mode: u-s,g-wxs,o=
loop: '{{ q(''ansible.builtin.subelements'', found_init_files.results, ''files'',
{''skip_missing'': True}) }}'
tags:
- CCE-80525-9
- DISA-STIG-RHEL-07-020710
- file_permission_user_init_files
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- restrict_strategy