All world-writable directories must be group-owned by root, sys, bin, or an application group.

From Red Hat Enterprise Linux 7 Security Technical Implementation Guide

Associated with: CCI-000366

SV-86671r3_rule All world-writable directories must be group-owned by root, sys, bin, or an application group.

Vulnerability discussion

If a world-writable directory has the sticky bit set and is not group-owned by a privileged Group Identifier (GID), unauthorized users may be able to modify files created by others.The only authorized public directories are those temporary directories supplied with the system or those designed to be temporary file repositories. The setting is normally reserved for directories used by the system and by users for temporary file storage, (e.g., /tmp), and for directories requiring global read/write access.

Check content

Verify all world-writable directories are group-owned by root, sys, bin, or an application group. Check the system for world-writable directories with the following command: Note: The value after -fstype must be replaced with the filesystem type. XFS is used as an example. # find / -xdev -perm -002 -type d -fstype xfs -exec ls -lLd {} \; drwxrwxrwt 2 root root 40 Aug 26 13:07 /dev/mqueue drwxrwxrwt 2 root root 220 Aug 26 13:23 /dev/shm drwxrwxrwt 14 root root 4096 Aug 26 13:29 /tmp If any world-writable directories are not owned by root, sys, bin, or an application group associated with the directory, this is a finding.

Fix text

Change the group of the world-writable directories to root with the following command: # chgrp root

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