Cron and crontab directories must not have extended ACLs.

From SUSE Linux Enterprise Server v11 for System z Security Technical Implementation Guide

Associated with: CCI-000225

SV-45603r1_rule Cron and crontab directories must not have extended ACLs.

Vulnerability discussion

To protect the integrity of scheduled system jobs and to prevent malicious modification to these jobs, crontab files must be secured. ACLs on cron and crontab directories may provide unauthorized access to these directories. Unauthorized modifications to these directories or their contents may result in the addition of unauthorized cron jobs or deny service to authorized cron jobs.

Check content

Check the permissions of the crontab directories. Procedure: # ls -ld /var/spool/cron /var/spool/cron/tabs ls -ld /etc/crontab /etc/cron.{d,daily,hourly,monthly,weekly} or # ls -ld /etc/cron*|grep -v deny If the permissions include a '+' the directory has an extended ACL. If the file has an extended ACL and it has not been documented with the IAO, this is a finding

Fix text

Remove the extended ACL from the directory. # setfacl --remove-all

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