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Verify the system-wide library files in directories "/lib", "/lib64", "/usr/lib/" and "/usr/lib64" are group-owned by root.

An XCCDF Rule

Description

System-wide library files are stored in the following directories by default: 

/lib
/lib64
/usr/lib
/usr/lib64
All system-wide shared library files should be protected from unauthorised access. If any of these files is not group-owned by root, correct its group-owner with the following command: 
$ sudo chgrp root FILE

Rationale

If the operating system were to allow any user to make changes to software libraries, then those changes might be implemented without undergoing the appropriate testing and approvals that are part of a robust change management process. This requirement applies to operating systems with software libraries that are accessible and configurable, as in the case of interpreted languages. Software libraries also include privileged programs which execute with escalated privileges. Only qualified and authorized individuals must be allowed to obtain access to information system components for purposes of initiating changes, including upgrades and modifications.

ID
xccdf_org.ssgproject.content_rule_root_permissions_syslibrary_files
Severity
Medium
References
Updated



Remediation - Ansible

- name: Find /lib/ file(s) matching ^.*$ recursively
  command: find -H /lib/  -type f ! -group 0 -regex "^.*$"
  register: files_found
  changed_when: false
  failed_when: false
  check_mode: false

Remediation - Shell Script


find /lib/  -type f ! -group 0 -regex '^.*$' -exec chgrp 0 {} \;

find /lib64/  -type f ! -group 0 -regex '^.*$' -exec chgrp 0 {} \;

find /usr/lib/  -type f ! -group 0 -regex '^.*$' -exec chgrp 0 {} \;