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The audit system must be configured to audit the loading and unloading of dynamic kernel modules - /sbin/rmmod


Overview

Finding ID Version Rule ID IA Controls Severity
V-29288 GEN002825-5 SV-37741r2_rule Medium
Description
Actions concerning dynamic kernel modules must be recorded as they are substantial events. Dynamic kernel modules can increase the attack surface of a system. A malicious kernel module can be used to substantially alter the functioning of a system, often with the purpose of hiding a compromise from the SA.
STIG Date
Red Hat Enterprise Linux 5 Security Technical Implementation Guide 2017-03-01

Details

Check Text ( C-36939r1_chk )
Determine if the /sbin/rmmod file is audited.

# cat /etc/audit/audit.rules | grep "/sbin/rmmod"

If the result does not start with "-w" and contain "-p x", this is a finding.
Fix Text (F-32203r2_fix)
The use of audit keys consistent with the provided example is encouraged to provide for uniform audit logs, however omitting the audit key or using an alternate audit key is not a finding.

Procedure:
Configure auditing of the /sbin/rmmod file.
Add the following to the "etc/audit/audit.rules" or "etc/audit.rules" file:

-w /sbin/rmmod -p x

Restart the auditd service.
# service auditd restart