Verify that Shared Library Directories Have Restrictive Permissions
An XCCDF Rule
Description
System-wide shared library directories, which contain are linked to executables during process load time or run time, are stored in the following directories by default:
/lib /lib64 /usr/lib /usr/lib64Kernel modules, which can be added to the kernel during runtime, are stored in
/lib/modules. All sub-directories 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 DIR
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_dir_permissions_library_dirs
- Severity
- Medium
- References
- Updated
Remediation - Ansible
- name: Find /lib/ file(s) recursively
command: 'find -H /lib/ -perm /g+w,o+w -type d '
register: files_found
changed_when: false
failed_when: false
check_mode: false
Remediation - Shell Script
find -H /lib/ -perm /g+w,o+w -type d -exec chmod g-w,o-w {} \;