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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/cdk-team/CDK/releases/

Drop executable files into target container and start testing.

Usage

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

Evaluate:
  cdk evaluate                              Gather information to find weakness 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/cdk-team/CDK/wiki

Auto Escape:
  cdk auto-escape <cmd>                     Escape container in different ways then let target execute <cmd>.

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 <path> (get|post) <uri> <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
Information Gathering	Kube-proxy Route Localnet(CVE-2020-8558)	✔	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	containerd-shim CVE-2020-15257	shim-pwn	✔	link
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
Escaping	Exploit lxcfs	lxcfs-rw	✔	link
Escaping	Rewrite Cgroup(devices.allow)	rewrite-cgroup-devices	✔	link
Discovery	K8s Component Probe	service-probe	✔	link
Discovery	Dump Istio Sidecar Meta	istio-check	✔	link
Remote Control	Reverse Shell	reverse-shell	✔	link
Credential Access	Access Key Scanning	ak-leakage	✔	link
Credential Access	Dump K8s Secrets	k8s-secret-dump	✔	link
Credential Access	Dump K8s Config	k8s-configmap-dump	✔	link
Persistence	Deploy WebShell	webshell-deploy	✔	link
Persistence	Deploy Backdoor Pod	k8s-backdoor-daemonset	✔	link
Persistence	Deploy Shadow K8s api-server	k8s-shadow-apiserver	✔	link
Persistence	K8s MITM Attack (CVE-2020-8554)	k8s-mitm-clusterip	✔	link
Persistence	Deploy K8s CronJob	k8s-cronjob	✔	link

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

Developer Docs

• run test in container.

TODO

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