February 3, 2021

880 words 5 mins read



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

repo name cdk-team/CDK
repo link https://github.com/cdk-team/CDK
homepage https://github.com/Xyntax/CDK/wiki
language Go
size (curr.) 9769 kB
stars (curr.) 1105
created 2020-11-05
license GNU General Public License v2.0

CDK - Zero Dependency Container Penetration Toolkit

English | 简体中文


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


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.


Download latest release in: https://github.com/cdk-team/CDK/releases/

Drop executable files into target container and start testing.


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

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

  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>.

  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 80,8080-9443 50 1000

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


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


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 RCE docker-sock-pwn link
Escaping Docker API(2375) RCE docker-api-pwn 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 link
ucurl Request to Docker Unix Socket link
rcurl Request to Docker Registry API
probe IP/Port Scanning link

Developer Docs

Contributing to CDK

First off, thanks for taking the time to contribute!

By reporting any issue, ideas or PRs, your GitHub ID will be listed here.

Bug Reporting

Bugs are tracked as GitHub Issues. Create an issue with the current CDK version, error msg and the environment. Describe the exact steps which reproduce the problem.

Suggesting Enhancements

Enhancement suggestions are tracked as GitHub Discussions. You can publish any thoughts here to discuss with developers directly.

Pull Requests

Fix problems or maintain CDK’s quality:

  • Describe the current CDK version, environment, problem and exact steps that reproduce the problem.
  • Running screenshots or logs before and after you fix the problem.

New feature or exploits:

  • Explain why this enhancement would be useful to other users.
  • Please enable a sustainable environment for us to review contributions.
  • Screenshots about how this new feature works.
  • If you are committing a new evaluate/exploit scripts, please add a simple doc to your PR message, here is an example.


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