Check: GEN002540
Title
All public directories must be group-owned by root or an application group. (Cat II impact)
Discussion
If a public directory has the sticky bit set and is not group-owned by a system 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
Check the group ownership of public directories. Procedure: # find / -type d -perm -1002 -exec ls -ld {} \; 2>/dev/null If any public directory is not group-owned by root, sys, bin, or an application group (such as mail), this is a finding.
Fix Text
Change the group ownership of the public directory. Procedure: # chgrp root /tmp (Replace root with a different system group and/or /tmp with a different public directory as necessary.)
Additional Identifiers
Rule ID:
Vulnerability ID: V-11990
Group Title:
Expert Comments
CCIs
| Number | Definition |
|---|---|
| CCI-000225 |
The organization employs the concept of least privilege, allowing only authorized accesses for users (and processes acting on behalf of users) which are necessary to accomplish assigned tasks in accordance with organizational missions and business functions. |
Controls
| Number | Title |
|---|---|
| AC-6 |
Least Privilege |