> 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/business-logic/overconfidence-on-the-client-side.md).
# 对客户端侧过度自信
对客户端侧过度自信，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。
### 对客户端控制的过度信任
**实验描述**
此应用程序未能正确验证客户端发送的数据。/ 可以利用购买流程中的逻辑缺陷来更改产品价格。/ 目标是购买 \*\*
提供的标识符：
* **用户**: wiener
* **密码**: peter
**行为分析**
网站上提供了一个购物车
将产品加入购物车时，会 **POST** 发送一个包含多个参数的请求，其中包括价格。
标准添加到购物车时观察到的请求示例：
```bash
productId=1&redir=PRODUCT&quantity=1&price=133700
```
该 **价格** 参数完全由客户端控制，且未在服务器端得到正确检查。
**利用**
通过手动更改 **价格** 请求中的参数，例如：
```bash
productId=1&redir=PRODUCT&quantity=1&price=0
```
服务器在未进行严格验证的情况下接受了该请求。
**结果**
商品被添加到购物车，且尽管客户端侧处理了价格，购买仍可被确认。/ 这表明对浏览器端控制过度依赖，从而使预期的业务逻辑可以被绕过。
---
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