Title

The sticky bit must be set on all world writable directories. (Cat II impact)

Discussion

Files in directories that have had the "sticky bit" enabled can only be deleted by users that have both write permissions for the directory in which the file resides, as well as ownership of the file or directory, or have sufficient privileges. As this prevents users from overwriting each others' files, whether it be accidental or malicious, it is generally appropriate for most world-writable directories (e.g., /tmp).

Check Content

The root role is required. Identify all world-writable directories without the "sticky bit" set. # find / \( -fstype nfs -o -fstype cachefs -o -fstype autofs \ -o -fstype ctfs -o -fstype mntfs -o -fstype objfs \ -o -fstype proc \) -prune -o -type d \( -perm -0002 \ -a ! -perm -1000 \) -ls Output of this command identifies world-writable directories without the "sticky bit" set. If output is created, this is a finding.

Fix Text

The root role is required. Ensure that the "sticky bit" is set on any directories identified during the check steps. # chmod +t [directory name]

Additional Identifiers

Rule ID: SV-216417r603267_rule

Vulnerability ID: V-216417

Group Title: SRG-OS-000480

Expert Comments

CCIs tied to check.

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