Title

"At" jobs must not set the umask to a value less restrictive than 077. (Cat II impact)

Discussion

The umask controls the default access mode assigned to newly created files. An umask of 077 limits new files to mode 700 or less permissive. Although umask is often represented as a 4-digit number, the first digit representing special access modes is typically ignored or required to be 0.

Check Content

Determine what "at" jobs exist on the system. Procedure: # ls /var/spool/cron/atjobs If there are no "at" jobs present, this is not applicable. Determine if any of the "at" jobs or any scripts referenced execute the umask command. Check for any umask setting more permissive than 077. # grep umask <at job or referenced script> If any "at" job or referenced script sets umask to a value more permissive than 077, this is a finding.

Fix Text

Edit "at" jobs or referenced scripts to remove umask commands setting umask to a value less restrictive than 077.

Additional Identifiers

Rule ID: SV-226870r854428_rule

Vulnerability ID: V-226870

Group Title: SRG-OS-000312

Expert Comments

CCIs tied to check.

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