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

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-216123	SOL-11.1-040420	SV-216123r505929_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 X86 Security Technical Implementation Guide	2020-09-03

Details

Check Text ( C-17361r462445_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", or the cron.allow file is removed if using RBAC. 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, or the at.allow file is removed if using RBAC.

Check Text ( C-17361r462445_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", or the cron.allow file is removed if using RBAC.

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, or the at.allow file is removed if using RBAC.

Fix Text (F-17359r462446_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 Skip the remaining steps only if using the “solaris.jobs.user” RBAC role. # 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

Fix Text (F-17359r462446_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

Skip the remaining steps only if using the “solaris.jobs.user” RBAC role.

# 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