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| Section | Weight | Objectives |
|---|---|---|
| Topic 1: System Hardening | 15% | - Enable audit logging - Kernel defaults and parameters using sysctl - Modify host components to improve security - Understand the concept of OPA (Open Policy Agent) and Gatekeeper |
| Topic 2: Cluster Hardening | 15% | - Minimize admission of containers without seccomp profiles - Minimize admission of containers that allow host namespaces - Minimize admission of containers without AppArmor profile - Minimize admission of containers with added capabilities - Minimize admission of containers with raw block devices - Minimize admission of containers without a security context - Minimize admission of privileged containers - Minimize admission of containers with sharing the host process namespace - Minimize admission of containers with sharing the host network namespace - Minimize admission of containers with FlexVolume volumes - Minimize admission of containers with allowPrivilegeEscalation - Minimize admission of containers with sharing the host IPC namespace - Minimize admission of containers with capabilities assigned - Minimize admission of containers with hostPath volumes |
| Topic 3: Supply Chain Security | 20% | - Minimize base image footprint - Use distroless images for static workload - Use image admission controllers to prevent use of untrusted images - Understand the software supply chain best practices - Understand image security scanning and its workflow - Sign container images and verify signatures - Use static analysis tools to detect vulnerabilities - Understand the container build process |
| Topic 4: Cluster Setup | 10% | - Use Pod Security Policies to control security-related pod behaviors - Use Cis benchmarks to check Kubernetes cluster settings - Use role-based access control (RBAC) to minimize exposure - Implement Pod-to-Pod encryption using mTLS or WireGuard - Understand the security implications of embedding cloud provider flags - Configure TLS certificates and minimum version for etcd - Manage sensitive information in clusters |
| Topic 5: Minimize Microservice Vulnerabilities | 20% | - Use PSP to enforce security controls - Set appropriate security contexts for pods and containers - Use AppArmor or seccomp profiles to constrain container behavior - Use OPA Gatekeeper to enforce security controls - Understand the principle of immutable containers - Configure network policies for namespace isolation |
| Topic 6: Monitoring, Logging, and Runtime Security | 20% | - Minimize the attack surface using container health indicators - Perform behavioral analytics to detect malicious activity - Falco - container security monitoring and threat detection - Understand and monitor network traffic - Audit and detect logs and events for anomalies - Detect threats at the container level |
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NEW QUESTION # 45
You can switch the cluster/configuration context using the following command: [desk@cli] $ kubectl config use-context stage Context: A PodSecurityPolicy shall prevent the creation of privileged Pods in a specific namespace. Task: 1. Create a new PodSecurityPolcy named deny-policy, which prevents the creation of privileged Pods. 2. Create a new ClusterRole name deny-access-role, which uses the newly created PodSecurityPolicy deny-policy. 3. Create a new ServiceAccount named psd-denial-sa in the existing namespace development. Finally, create a new ClusterRoleBindind named restrict-access-bind, which binds the newly created ClusterRole deny-access-role to the newly created ServiceAccount psp-denial-sa
Answer:
Explanation:
Create psp to disallow privileged container
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: deny-access-role
rules:
- apiGroups: ['policy']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames:
- "deny-policy"
k create sa psp-denial-sa -n development
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
name: restrict-access-bing
roleRef:
kind: ClusterRole
name: deny-access-role
apiGroup: rbac.authorization.k8s.io
subjects:
- kind: ServiceAccount
name: psp-denial-sa
namespace: development
Explanation
master1 $ vim psp.yaml
apiVersion: policy/v1beta1
kind: PodSecurityPolicy
metadata:
name: deny-policy
spec:
privileged: false # Don't allow privileged pods!
seLinux:
rule: RunAsAny
supplementalGroups:
rule: RunAsAny
runAsUser:
rule: RunAsAny
fsGroup:
rule: RunAsAny
volumes:
- '*'
master1 $ vim cr1.yaml
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
name: deny-access-role
rules:
- apiGroups: ['policy']
resources: ['podsecuritypolicies']
verbs: ['use']
resourceNames:
- "deny-policy"
master1 $ k create sa psp-denial-sa -n development master1 $ vim cb1.yaml apiVersion: rbac.authorization.k8s.io/v1 kind: ClusterRoleBinding metadata:
name: restrict-access-bing
roleRef:
kind: ClusterRole
name: deny-access-role
apiGroup: rbac.authorization.k8s.io
subjects:
# Authorize specific service accounts:
- kind: ServiceAccount
name: psp-denial-sa
namespace: development
master1 $ k apply -f psp.yaml master1 $ k apply -f cr1.yaml master1 $ k apply -f cb1.yaml Reference: https://kubernetes.io/docs/concepts/policy/pod-security-policy/
NEW QUESTION # 46
You have a Kubernetes cluster running a critical application with a Deployment named 'myapp-deployment. You suspect a recent image update has introduced a vulnerability that's causing the application to crash frequently.
You need to investigate this issue and determine the exact phase of the attack and the potential bad actor responsible. You have access to the following resources: Kubernetes audit logs: Enabled at the cluster level.
Container logs: Available for all pods associated with the 'myapp-deployments Network traffic logs: Captured by a network security solution. How would you use these resources to identify the attack phase, the potential bad actor, and the source of the vulnerability?
Answer:
Explanation:
Solution (Step by Step) :
1. Analyze Kubernetes Audit Logs:
Focus on events related to the 'myapp-deployment: Search for entries related to pod creation, deletion, image pulls, and resource updates. Look for suspicious activity: Pay attention to any unusual image updates, unauthorized access attempts, or resource changes that occurred around the time of the crashes.
Identify the user or service account responsible for the changes: This could point to a potential bad actor if the user'service account is not expected to modify the Deployment.
2. Examine Container Logs:
Search for crash messages and error codes: This will provide insights into the specific cause of the application crashes.
Identify any unusual or suspicious activity within the container: Look for signs of malicious processes, unauthorized network connections, or data exfiltration attempts.
3. Analyze Network Traffic Logs:
Identify the source of the compromised image: Network logs can reveal the IP address of the registry or repository from which the vulnerable image was pulled.
Examine network connections from the affected pods: Look for unusual or unauthorized outbound connections that could indicate malware or communication with a malicious server.
4. Correlate Findings:
Combine information from the different logs to build a comprehensive picture of the attack.
For example, if you find a suspicious image pull in the audit logs, and the container logs show signs of malware activity, you have strong evidence of malicious image vulnerability.
Example Code Snippets:
Kubernetes Audit Logs (using kubectl):
bash
kubectl logs -f -n kube-system kube-apiserver -c kube-apiserver | grep "myapp-deployment" | grep "Create" | grep "Image"
Container Logs (using kubectl):
bash
kubectl logs -f myapp-deployment-pod-name -c myapp
Network Traffic Logs (using a network security tool like Falco):
falco -f falco.yaml -o json
Note: The specific commands and tools may vary depending on your Kubernetes environment and security tools.
NEW QUESTION # 47
SIMULATION
A container image scanner is set up on the cluster.
Given an incomplete configuration in the directory
/etc/Kubernetes/confcontrol and a functional container image scanner with HTTPS endpoint https://acme.local.8081/image_policy
1. Enable the admission plugin.
2. Validate the control configuration and change it to implicit deny.
Finally, test the configuration by deploying the pod having the image tag as the latest.
Answer: A
NEW QUESTION # 48
You're setting up a new Kubernetes cluster for a critical application, and you want to ensure that only authorized users can access the cluster's API server. Implement a solution using RBAC to achieve this, outlining the steps and the necessary configurations.
Answer:
Explanation:
Solution (Step by Step) :
1. Create a ClusterRole:
- Define a ClusterRole named 'cluster-admins that grants comprehensive permissions to manage cluster resources.
2. Create a ClusterRoleBinding: - Bind the 'cluster-admin' ClusterRoIe to a specific user or service account. - This grants the bound entity administrative access to the cluster.
3. Create a Role: - Define a Role named 'pod-reader' that grants limited access to read pod information.
4. Create a RoIeBjnding: - Bind the 'pod-reader Role to a group of users or service accounts. - This allows the bound entities to read pod information within the specified namespace.
5. Configure Authentication: - Set up authentication methods for accessing the API server, such as: - x509 certificates: Use digital certificates to authenticate users. - OAuth2: Use OAuth2 for user authentication. - Basic authentication: Use username and password for authentication.
NEW QUESTION # 49
You are using a container image signed by a trusted entity. Describe the steps involved in verifying the signature of the image during the image pull process in Kubernetes.
Answer:
Explanation:
Solution (Step by Step) :
1. Generate the Signature:
- The trusted entity uses a signing key and algorithm to create a signature for the container image.
- The signature is typically stored as a separate file or within a manifest file associated with the image.
2. Configure the Kubernetes Cluster:
- Enable the 'ImageSignatureVerification' feature gate in your Kubernetes cluster. This feature gate enables the cluster to verity image signatures-
- Configure the 'ImageP01icyWebh00k' to point to a custom webnook server that will handle the signature verification process.
3. Implement the Webhook Server:
- Create a custom webhook server that will be responsible for verifying the image signature.
- This server will:
- Receive tne image manifest and signature from Kubernetes.
- Validate the signature using the trusted entity's public key.
- Return a success or failure status to Kubernetes based on the verification outcome.
4. Pull the Signed Image:
- When you pull the signed image from the registry, Kubernetes will:
- Fetch the image manifest and signature.
- Send them to the 'ImagePolicyWebhooR for verification.
- If the webhook returns a success status, the image will be allowed to run.
- If the webhook returns a failure status, the image will be rejected.
5. Example Implementation:
- You can use tools like 'cosign' or 'sigstores to generate and verify image signatures.
- Implement the webhook server using a programming language like Go or Python.
# Example using cosign to verify a signature cosign verify -key
- This command will use the provided public key to verify the signature of the specified image.
6. Security Considerations:
- Ensure that the webhook server is secure and only accessible to authorized Kubernetes components.
- Use robust authentication and authorization mechanisms for the webh00k server.
- Consider implementing rate limiting to protect against potential denial-of-service attacks.
NEW QUESTION # 50
......
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