Title

The sticky bit must be set on all public directories. (Cat III impact)

Discussion

Failing to set the sticky bit on the public directories allows unauthorized users to delete files in the directory structure. 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 have the sticky bit set. Procedure: # find / -type d -perm -002 ! -perm -1000 > wwlist If the sticky bit is not set on a world-writable directory, this is a finding.

Fix Text

Set the sticky bit on all public directories. Procedure: # chmod 1777 /tmp (Replace /tmp with the public directory missing the sticky bit, if necessary.)

Additional Identifiers

Rule ID: SV-806r2_rule

Vulnerability ID: V-806

Group Title: GEN002500

Expert Comments

CCIs tied to check.

Controls tied to check. These are derived from the CCIs shown above.