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Verify that System Executables Have Restrictive Permissions

An XCCDF Rule

Description

System executables are stored in the following directories by default: 

/bin
/sbin
/usr/bin
/usr/libexec
/usr/local/bin
/usr/local/sbin
/usr/sbin
All files in these directories should not be group-writable or world-writable. If any file 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

Rationale

System binaries are executed by privileged users, as well as system services, and restrictive permissions are necessary to ensure execution of these programs cannot be co-opted.

ID
xccdf_org.ssgproject.content_rule_file_permissions_binary_dirs
Severity
Medium
References
Updated



Remediation - Ansible

- name: Read list of world and group writable system executables
  ansible.builtin.command: find /bin /usr/bin /usr/local/bin /sbin /usr/sbin /usr/local/sbin
    /usr/libexec -perm /022 -type f
  register: world_writable_library_files
  changed_when: false
  failed_when: false

Remediation - Shell Script

DIRS="/bin /usr/bin /usr/local/bin /sbin /usr/sbin /usr/local/sbin /usr/libexec"
for dirPath in $DIRS; do
	find "$dirPath" -perm /022 -exec chmod go-w '{}' \;
done