CDK v1.5.2 releases: open-sourced container penetration toolkit

CDK – Zero Dependency Container Penetration Toolkit

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 the container and take over the K8s cluster easily.

Features

CDK has three modules:

Evaluate: gather information inside the container to find the potential weaknesses.
Exploit: for container escaping, persistence, and lateral movement
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	In Thin	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	LXCFS Escaping	lxcfs-rw	✔	✔	link
Escaping	Cgroups Escaping	mount-cgroup	✔	✔	link
Escaping	Procfs Escaping	mount-procfs	✔	✔	link
Escaping	Ptrace Escaping PoC	check-ptrace	✔	✔	link
Escaping	Rewrite Cgroup(devices.allow)	rewrite-cgroup-devices	✔	✔	link
Escaping	Read arbitrary file from host system (CAP_DAC_READ_SEARCH)	cap-dac-read-search	✔	✔	link
Discovery	K8s Component Probe	service-probe	✔	✔	link
Discovery	Dump Istio Sidecar Meta	istio-check	✔	✔	link
Discovery	Dump K8s Pod Security Policies	k8s-psp-dump	✔		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
Privilege Escalation	K8s RBAC Bypass	k8s-get-sa-token	✔	✔	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

Note about Thin: The thin release is prepared for short-life container shells such as serverless functions. We add build tags in the 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
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

Changelog v1.5.2

💣 Exploits

Fix 78(exp): support containerd and other linux path

🧰 Tools

Fix #77(exp shadow-apiserver): anonymous-auth is not valid, support v1.23.1

✨ Others

Fix 78(exp): support containerd and other linux path
Chore(exp): add alert message about flag auto-escape is deprecated

Download & Use

Tags: container penetration toolkit