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Kubnerable

Kubnerable is an out-cluster vulnerability scanner tool for Kubernetes resources. It comes with a predefined vulnerability database (vulnerabilities.yaml) with basic pod weaknesses checks.

For testing purposes, there is a Kind setup for bootstrapping a cluster with vulnerable predefined scenarios. For more info, check the following README.

This project was done as part of my Master's Thesis and as an excuse to learn Go from scratch 🐹

Features

Kubnerable Execution

  • Out-cluster resource vulnerabilities scanning
    • Needs a valid Kubeconfig file with read access
  • Correlates vulnerabilities with risk and CVSS score
  • Allows custom vulnerabilities or checks

Usage

❯ ./kubnerable -h
Kubnerable scans all pods and containers of a Kubernetes cluster in search of exploitable vulnerabilities

Usage:
  kubnerable [flags]

Examples:
kubnerable -f ../vulnerabilities.yaml

Flags:
  -h, --help               help for kubnerable
  -f, --vuls-file string   Vulnerabilities YAML file path, needed for scanning (default "../vulnerabilities.yaml")

TODOs

  • Resource denial of services and the associated scenario
  • Network exposure and the associted scenario
  • RBAC analysis

Inspirations

Kubnerable is inspired by today's state-of-the-art Kubernetes vulnerability scanners:

  • Kubernetes vulnerability mapping inspired by Octarine's KCCSS
  • YAML Vulnerability Database inspired by Aqua Security's Kube-Bench