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V-274862

CAT II (Medium)

Ubuntu 22.04 LTS must audit any script or executable called by cron as root or by any privileged user.

Rule ID

SV-274862r1155211_rule

STIG

Canonical Ubuntu 22.04 LTS Security Technical Implementation Guide

Version

V2R8

CCIs

CCI-000172

Discussion

Any script or executable called by cron as root or by any privileged user must be owned by that user, must have the permissions 755 or more restrictive, and should have no extended rights that allow any nonprivileged user to modify the script or executable.

Check Content

Verify Ubuntu 22.04 LTS is configured to audit the execution of any system call made by cron as root or as any privileged user.

$ sudo auditctl -l | grep /etc/cron.d
-w /etc/cron.d -p wa -k cronjobs

$ sudo auditctl -l | grep /var/spool/cron
-w /var/spool/cron -p wa -k cronjobs

If either of these commands do not return the expected output, or the lines are commented out, this is a finding.

Fix Text

Configure Ubuntu 22.04 LTS to audit the execution of any system call made by cron as root or as any privileged user.

Add or update the following file system rules to "/etc/audit/rules.d/audit.rules":
-w /etc/cron.d/ -p wa -k cronjobs
-w /var/spool/cron/ -p wa -k cronjobs

To load the rules to the kernel immediately, use the following command:

$ sudo augenrules --load