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CDK - Zero Dependency Container Penetration Toolkit

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Legal Disclaimer

Usage of CDK for attacking targets without prior mutual consent is illegal. CDK is for security testing purposes only.

Overview

CDK is an open-sourced container penetration toolkit, designed for offering stable exploitation in different slimmed containers without any OS dependency. It comes with useful net-tools and many powerful PoCs/EXPs helps you to escape container and takeover K8s cluster easily.

Currently still under development, submit issues or mail i@cdxy.me if you need any help.

Installation

Download latest release in: https://github.com/Xyntax/CDK/releases/

Drop executable files into target container and start testing.

Usage

Container DucK
Zero-dependency docker/k8s penetration toolkit by <i@cdxy.me>
Find tutorial, configuration and use-case in https://github.com/Xyntax/CDK/wiki

Usage:
  cdk evaluate [--full]
  cdk run (--list | <exploit> [<args>...])
  cdk <tool> [<args>...]

Evaluate:
  cdk evaluate                              Gather information to find weekness inside container.
  cdk evaluate --full                       Enable file scan during information gathering.

Exploit:
  cdk run --list                            List all available exploits.
  cdk run <exploit> [<args>...]             Run single exploit, docs in https://github.com/Xyntax/CDK/wiki

Tool:
  vi <file>                                 Edit files in container like "vi" command.
  ps                                        Show process information like "ps -ef" command.
  nc [options]                              Create TCP tunnel.
  ifconfig                                  Show network information.
  kcurl	(get|post) <url> <data>             Make request to K8s api-server.
  ucurl (get|post) <socket> <uri> <data>    Make request to docker unix socket.
  probe <ip> <port> <parallel> <timeout-ms> TCP port scan, example: cdk probe 10.0.1.0-255 80,8080-9443 50 1000

Options:
  -h --help     Show this help msg.
  -v --version  Show version.

Features

CDK have three modules:

1. Evaluate: gather information inside container to find potential weakness.
2. Exploit: for container escaping, persistance and lateral movement
3. Tool: network-tools and APIs for TCP/HTTP requests, tunnels and K8s cluster management.

Evaluate Module

Usage

cdk evaluate [--full]

This command will run the scripts below without local file scanning, using --full to enable all.

Tactics	Script	Supported	Usage/Example
Information Gathering	OS Basic Info	✔	link
Information Gathering	Available Capabilities	✔	link
Information Gathering	Available Linux Commands	✔	link
Information Gathering	Mounts	✔	link
Information Gathering	Net Namespace	✔	link
Information Gathering	Sensitive ENV	✔	link
Information Gathering	Sensitive Process	✔	link
Information Gathering	Sensitive Local Files	✔	link
Discovery	K8s Api-server Info	✔	link
Discovery	K8s Service-account Info	✔	link
Discovery	Cloud Provider Metadata API	✔	link

Exploit Module

List all available exploits:

cdk run --list

Run targeted exploit:

cdk run <script-name> [options]

Tactic	Technique	CDK Exploit Name	Supported	Doc
Escaping	docker-runc CVE-2019-5736	runc-pwn	✔
Escaping	docker-cp CVE-2019-14271
Escaping	containerd-shim CVE-2020-15257	shim-pwn	✔	link
Escaping	dirtycow CVE-2016-5159
Escaping	docker.sock PoC (DIND attack)	docker-sock-check	✔	link
Escaping	docker.sock Backdoor Image Deploy	docker-sock-deploy	✔	link
Escaping	Device Mount Escaping	mount-disk	✔	link
Escaping	Cgroups Escaping	mount-cgroup	✔	link
Escaping	Procfs Escaping	mount-procfs	✔	link
Escaping	Ptrace Escaping PoC	check-ptrace	✔	link
Discovery	K8s Component Probe	service-probe	✔	link
Lateral Movement	K8s Service Account Control
Lateral Movement	Attack K8s api-server
Lateral Movement	Attack K8s Kubelet
Lateral Movement	Attack K8s Dashboard
Lateral Movement	Attack K8s Helm
Lateral Movement	Attack K8s Etcd
Lateral Movement	Attack Private Docker Registry
Remote Control	Reverse Shell	reverse-shell	✔	link
Credential Access	Access Key Scanning	ak-leakage	✔	link
Credential Access	Dump K8s Secrets	k8s-secret-dump	✔
Credential Access	Dump K8s Config	k8s-configmap-dump	✔
Persistence	Deploy WebShell
Persistence	Deploy Backdoor Pod
Persistence	Deploy Shadow K8s api-server
Persistence	Deploy K8s CronJob
Defense Evasion	Disable K8s Audit

Tool Module

Running commands like in Linux, little different in input-args, see the usage link.

cdk nc [options]
cdk ps

Command	Description	Supported	Usage/Example
nc	TCP Tunnel	✔	link
ps	Process Information	✔	link
ifconfig	Network Information	✔	link
vi	Edit Files	✔	link
kcurl	Request to K8s api-server	✔	link
dcurl	Request to Docker HTTP API
ucurl	Request to Docker Unix Socket	✔	link
rcurl	Request to Docker Registry API
probe	IP/Port Scanning	✔	link

TODO

1. Echo loader for delivering CDK into target container via Web RCE.
2. EDR defense evasion.
3. Compile optimization.
4. Dev docs