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System-wide shared library files, which are linked to executables during process load time or run time, are stored in the following directories by default:
/lib
/lib64
/usr/lib
/usr/lib64
Kernel modules, which can be added to the kernel during runtime, are
stored in /lib/modules
. All files in these directories
should not be group-writable or world-writable. If any file in these
directories is found to be group-writable or world-writable, correct
its permission with the following command:
$ sudo chmod go-w FILE
Files from shared library directories are loaded into the address space of processes (including privileged ones) or of the kernel itself at runtime. Restrictive permissions are necessary to protect the integrity of the system.
The following script can be run on the host to remediate the issue.
#!/bin/bash
find -H /lib/ -perm /g+w,o+w -type f -regex '^.*$' -exec chmod g-w,o-w {} \;
find -H /lib64/ -perm /g+w,o+w -type f -regex '^.*$' -exec chmod g-w,o-w {} \;
find -H /usr/lib/ -perm /g+w,o+w -type f -regex '^.*$' -exec chmod g-w,o-w {} \;
find -H /usr/lib64/ -perm /g+w,o+w -type f -regex '^.*$' -exec chmod g-w,o-w {} \;
The following playbook can be run with Ansible to remediate the issue.
- name: Find /lib/ file(s) recursively
command: find -H /lib/ -perm /g+w,o+w -type f -regex "^.*$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Set permissions for /lib/ file(s)
file:
path: '{{ item }}'
mode: g-w,o-w
state: file
with_items:
- '{{ files_found.stdout_lines }}'
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Find /lib64/ file(s) recursively
command: find -H /lib64/ -perm /g+w,o+w -type f -regex "^.*$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Set permissions for /lib64/ file(s)
file:
path: '{{ item }}'
mode: g-w,o-w
state: file
with_items:
- '{{ files_found.stdout_lines }}'
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Find /usr/lib/ file(s) recursively
command: find -H /usr/lib/ -perm /g+w,o+w -type f -regex "^.*$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Set permissions for /usr/lib/ file(s)
file:
path: '{{ item }}'
mode: g-w,o-w
state: file
with_items:
- '{{ files_found.stdout_lines }}'
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Find /usr/lib64/ file(s) recursively
command: find -H /usr/lib64/ -perm /g+w,o+w -type f -regex "^.*$"
register: files_found
changed_when: false
failed_when: false
check_mode: false
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed
- name: Set permissions for /usr/lib64/ file(s)
file:
path: '{{ item }}'
mode: g-w,o-w
state: file
with_items:
- '{{ files_found.stdout_lines }}'
tags:
- DISA-STIG-UBTU-20-010426
- NIST-800-53-AC-6(1)
- NIST-800-53-CM-5(6)
- NIST-800-53-CM-5(6).1
- NIST-800-53-CM-6(a)
- configure_strategy
- file_permissions_library_dirs
- low_complexity
- low_disruption
- medium_severity
- no_reboot_needed