Title

Ubuntu 24.04 LTS must audit any script or executable called by cron as root or by any privileged user. (Cat II impact)

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 that Ubuntu 24.04 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 does not return the expected output, or the lines are commented out, this is a finding.

Fix Text

Configure Ubuntu 24.04 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": auditctl -w /etc/cron.d/ -p wa -k cronjobs auditctl -w /var/spool/cron/ -p wa -k cronjobs To load the rules to the kernel immediately, use the following command: $ sudo augenrules --load

Additional Identifiers

Rule ID: SV-274870r1107304_rule

Vulnerability ID: V-274870

Group Title: SRG-OS-000471-GPOS-00215

Expert Comments

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