OpenShift must prevent kernel profiling.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-257553	CNTR-OS-000610	SV-257553r921602_rule		Medium

Description
Kernel profiling involves monitoring and analyzing the behavior of the kernel, including its internal operations and system calls. This level of access and visibility into the kernel can potentially be exploited by attackers to gather sensitive information or launch attacks. By preventing kernel profiling, the attack surface is minimized and the risk of unauthorized access or malicious activities targeting the kernel is reduced. Kernel profiling can introduce additional overhead and resource utilization, potentially impacting the stability and performance of the system. Profiling tools and techniques often involve instrumenting the kernel code, injecting hooks, or collecting detailed data, which may interfere with the normal operation of the kernel. By disallowing kernel profiling, OpenShift helps ensure the stability and reliability of the platform, preventing any potential disruptions caused by profiling activities.

Description

Kernel profiling involves monitoring and analyzing the behavior of the kernel, including its internal operations and system calls. This level of access and visibility into the kernel can potentially be exploited by attackers to gather sensitive information or launch attacks. By preventing kernel profiling, the attack surface is minimized and the risk of unauthorized access or malicious activities targeting the kernel is reduced. Kernel profiling can introduce additional overhead and resource utilization, potentially impacting the stability and performance of the system. Profiling tools and techniques often involve instrumenting the kernel code, injecting hooks, or collecting detailed data, which may interfere with the normal operation of the kernel. By disallowing kernel profiling, OpenShift helps ensure the stability and reliability of the platform, preventing any potential disruptions caused by profiling activities.

STIG	Date
Red Hat OpenShift Container Platform 4.12 Security Technical Implementation Guide	2023-08-28

Details

Check Text ( C-61288r921600_chk )
Verify the Red Hat Enterprise Linux CoreOS (RHCOS) is configured to prevent kernel profiling by unprivileged users. Check the status of the kernel.perf_event_paranoid kernel parameter by executing the following: for node in $(oc get node -oname); do oc debug $node -- chroot /host /bin/bash -c 'echo -n "$HOSTNAME "; sysctl kernel.perf_event_paranoid ' 2>/dev/null; done If "kernel.perf_event_paranoid" is not set to "2" or is missing, this is a finding.

Check Text ( C-61288r921600_chk )

Verify the Red Hat Enterprise Linux CoreOS (RHCOS) is configured to prevent kernel profiling by unprivileged users.

Check the status of the kernel.perf_event_paranoid kernel parameter by executing the following:

for node in $(oc get node -oname); do oc debug $node -- chroot /host /bin/bash -c 'echo -n "$HOSTNAME "; sysctl kernel.perf_event_paranoid
' 2>/dev/null; done

If "kernel.perf_event_paranoid" is not set to "2" or is missing, this is a finding.

Fix Text (F-61212r921601_fix)
Apply the machine config to prevent kernel profiling by executing the following: for mcpool in $(oc get mcp -oname \| sed "s:.*/::" ); do echo "apiVersion: machineconfiguration.openshift.io/v1 kind: MachineConfig metadata: name: 75-sysctl-kernel-perf-event-paranoid-$mcpool labels: machineconfiguration.openshift.io/role: $mcpool spec: config: ignition: version: 3.1.0 storage: files: - contents: source: data:,kernel.perf_event_paranoid%3D2%0A mode: 0644 path: /etc/sysctl.d/75-sysctl_kernel_perf_event_paranoid.conf overwrite: true " \| oc apply -f - done

Fix Text (F-61212r921601_fix)

Apply the machine config to prevent kernel profiling by executing the following:

for mcpool in $(oc get mcp -oname | sed "s:.*/::" ); do
echo "apiVersion: machineconfiguration.openshift.io/v1
kind: MachineConfig
metadata:
name: 75-sysctl-kernel-perf-event-paranoid-$mcpool
labels:
machineconfiguration.openshift.io/role: $mcpool
spec:
config:
ignition:
version: 3.1.0
storage:
files:
- contents:
source: data:,kernel.perf_event_paranoid%3D2%0A
mode: 0644
path: /etc/sysctl.d/75-sysctl_kernel_perf_event_paranoid.conf
overwrite: true
" | oc apply -f -
done