Unauthorized use of the at or cron capabilities must not be permitted.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-48125	SOL-11.1-040420	SV-60997r3_rule		Medium

Description
On many systems, only the system administrator needs the ability to schedule jobs. Even though a given user is not listed in the "cron.allow" file, cron jobs can still be run as that user. The "cron.allow" file only controls administrative access to the "crontab" command for scheduling and modifying cron jobs. Much more effective access controls for the cron system can be obtained by using Role-Based Access Controls (RBAC).

Description

On many systems, only the system administrator needs the ability to schedule jobs. Even though a given user is not listed in the "cron.allow" file, cron jobs can still be run as that user. The "cron.allow" file only controls administrative access to the "crontab" command for scheduling and modifying cron jobs. Much more effective access controls for the cron system can be obtained by using Role-Based Access Controls (RBAC).

STIG	Date
Solaris 11 SPARC Security Technical Implementation Guide	2017-03-02

Details

Check Text ( C-50557r3_chk )
Check that "at" and "cron" users are configured correctly. # ls /etc/cron.d/cron.deny If cron.deny exists, this is a finding. # ls /etc/cron.d/at.deny If at.deny exists, this is a finding. # cat /etc/cron.d/cron.allow cron.allow should have a single entry for "root". If any accounts other than root that are listed and they are not properly documented with the IA staff, this is a finding. # wc -l /etc/cron.d/at.allow \| awk '{ print $1 }' If the output is non-zero, this is a finding.

Check Text ( C-50557r3_chk )

Check that "at" and "cron" users are configured correctly.

# ls /etc/cron.d/cron.deny

If cron.deny exists, this is a finding.

# ls /etc/cron.d/at.deny

If at.deny exists, this is a finding.

# cat /etc/cron.d/cron.allow

cron.allow should have a single entry for "root".

If any accounts other than root that are listed and they are not properly documented with the IA staff, this is a finding.

# wc -l /etc/cron.d/at.allow | awk '{ print $1 }'

If the output is non-zero, this is a finding.

Fix Text (F-51733r2_fix)
The root role is required. Modify the cron configuration files. # mv /etc/cron.d/cron.deny /etc/cron.d/cron.deny.temp # mv /etc/cron.d/at.deny /etc/cron.d/at.deny.temp # echo root > /etc/cron.d/cron.allow # cp /dev/null /etc/cron.d/at.allow # chown root:root /etc/cron.d/cron.allow /etc/cron.d/at.allow # chmod 400 /etc/cron.d/cron.allow /etc/cron.d/at.allow