Title

Cron programs must not set the umask to a value less restrictive than 077. (Cat III impact)

Discussion

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

Check Content

Determine if there are any crontabs by viewing a long listing of the directory. If there are crontabs, examine them to determine what cron jobs exist. Check for any programs specifying an umask more permissive than 077: Procedure: # ls -lL /var/spool/cron /var/spool/cron/tabs # ls -lL /etc/crontab /etc/cron.{d,daily,hourly,monthly,weekly} or # ls -lL /etc/cron.*|grep -v deny # cat <crontab file> # grep umask <cron program> If there are no cron jobs present, this vulnerability is not applicable. If any cron job contains an umask more permissive than 077, this is a finding.

Fix Text

Edit cron script files and modify the umask to 077.

Additional Identifiers

Rule ID: SV-45633r1_rule

Vulnerability ID: V-4360

Group Title: GEN003220

Expert Comments

CCIs tied to check.

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