vasant

Posted on Jan 15, 2021

Kubestriker - A Blazing fast Security Auditing tool for kubernetes!!

#devops #security #programming #kubernetes

A Blazing fast Security Auditing tool for kubernetes!!

Kubernetes is a big, complex, fast-moving platform that solves problems such as high availability, resiliency, and scaling by providing an extensible, declarative platform that automates the management of containers.

Enterprise organisations across nearly all verticals, including those with strong security requirements, such as financial services, healthcare, government, and telecommunications, are deploying production applications to Kubernetes clusters.

While this rapid adoption of Kubernetes shows just how disruptive these technologies have been, they have also led to new security problems.

The security of the cluster, of course, cannot be achieved in a single process. There are many moving parts within the Kubernetes cluster that must be properly secured. But with so many moving parts, keeping your Kubernetes secure is no trivial task.

Basic Overview

Kubestriker performs numerous in depth checks on kubernetes infra to identify the security misconfigurations and challenges that devops engineers/developers are likely to encounter when using Kubernetes, especially in production and at scale.

kubestriker is Platform agnostic and works equally well across more than one platform such as self hosted kubernetes, Amazon EKS, Azure AKS, Google GKE etc.

How To Install

Clone the repo and install

To install this tool or clone and run this application, you'll need Git, python3 and pip installed on your computer. It is advised you install this tool in virtual environment

From your command line:


# Create python virtual environment
$ python3 -m venv env

# Activate python virtual environment
$ source env/bin/activate

# Clone this repository
$ git clone https://github.com/vchinnipilli/kubestriker.git

# Go into the repository
$ cd kubestriker

# Install dependencies
$ pip install -r requirements.txt

# Incase of prompt toolkit or selectmenu errors
$ pip install prompt-toolkit==1.0.15 
$ pip install -r requirements.txt

# Gearing up Kubestriker
$ python -m kubestriker

# Result will be generated in the current working directory with the name of the target

Install using pip

To install and run this application, you'll need pip installed on your computer. From your command line:


# Create python virtual environment
$ python3 -m venv env

# Activate python virtual environment
$ source env/bin/activate

# Install using pip
$ pip install kubestriker

# Incase of prompt toolkit or selectmenu errors
$ pip install prompt-toolkit==1.0.15 
$ pip install kubestriker

# Gearing up Kubestriker
$ python -m kubestriker

# Result will be generated in the current working directory with the name of the target

How to spin up kubestriker container

Use this link to view the Kubestriker container latest releases

# Spinning up the kubestriker Container
$ docker run -it --rm -v /Users/vasantchinnipilli/.kube/config:/root/.kube/config -v "$(pwd)":/kubestriker --name kubestriker cloudsecguy/kubestriker:v1.0.0

# Replace the user vasantchinnipilli above with your username or absolute path of kube config file
$ docker run -it --rm -v /Users/<yourusername>/.kube/config:/root/.kube/config -v "$(pwd)":/kubestriker --name kubestriker cloudsecguy/kubestriker:v1.0.0

# Gearing up Kubestriker
$ python -m kubestriker

# Result will be generated in the current working directory with the name of the target

Types of Scans

Authenticated scans

Authenticated scan expects the user to have atleast read-only privileges and provide a token during the scan. please use the below provided links to create read-only users

Create read-only user for Amazon eks\
Create read-only user for Azure aks\
Create read-only user for Google gke\
Create a subject using Role based access control

# To grab a token from eks cluster
$ aws eks get-token --cluster-name cluster-name --region ap-southeast-2

# To grab a token from aks cluster
$ az aks get-credentials --resource-group myResourceGroup --name myAKSCluster

# To grab a token from gke cluster
$ gcloud container clusters get-credentials CLUSTER_NAME --zone=COMPUTE_ZONE

# To grab a token from service account
$ kubectl -n namespace get secret serviceaccount-token -o jsonpath='{.data.token}'

# To grab a token from a pod directly or via command execution bug
$ cat /run/secrets/kubernetes.io/serviceaccount/token

Unauthenticated scans

Unauthenticated scan will be successful incase of anonymous access is permitted on the target cluster

Identifying an open Insecure port on kubernetes master node

Identifying a worker Node with kubelet readwrite and readonly ports open

Current Capabilities

Scans Self Managed and cloud provider managed kubernetes infra
Reconnaissance phase checks for various services or open ports
Performs automated scans incase of insecure, readwrite or readonly services are enabled
Performs both authenticated scans and unauthenticated scans
Scans for wide range of IAM Misconfigurations in the cluster
Scans for wide range of Misconfigured containers
Scans for wide range of Misconfigured Pod Security Policies
Scans for wide range of Misconfigured Network policies
Scans the privileges of a subject in the cluster
Run commands on the containers and streams back the output
Provides the endpoints of the misconfigured services
Provides possible privilege escalation details
Elaborative report with detailed explanation

Future improvements

Automated exploitation based on the issues identified
api and cicd automation friendly
A Decent FrontEnd to make the lives easier

Suggestions

Kubestriker is an opensource and emailware. Meaning, if you liked using this tool or it has helped you in any way or if you have any suggestions/improvements, I'd like you send me an email at vchinnipilli@gmail.com about anything you'd want to say about this tool. I'd really appreciate it!

Contributors

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License

Apache License

Support

vasant chinnipilli builds and maintains kubestriker to audit and secure kubernetes infrastructure.

Start with Documentation - will be available soon for quick tutorials and examples.

If you need direct support you can contact me at vchinnipilli@gmail.com.

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