> 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/inconsistent-management-of-exceptional-entries.md).
# 对异常条目的不一致管理
### 异常输入处理不一致
**实验说明**
该实验室展示了注册过程中对用户输入的验证不充分。这个逻辑缺陷使得可以访问通常仅供员工使用的管理功能。/ 目的：访问管理面板并删除用户 **carlos**.
**初步观察**
注册后，验证邮件会发送到所提供的地址。/ 运行服务器会接收与该域及其子域相关的\*\*所有邮件\*\*：
```bash
@exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
因此，使用该域或其子域创建的任何地址都是可接受的。
**已识别异常行为**
通过创建一个在 `@` 符号前包含大量字符的邮箱地址，我们发现该字段\*\*
{% code overflow="wrap" %}
```bash
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
{% endcode %}
这个限制会导致实际存储的值与显示或用于安全检查的值之间不一致。
**漏洞运作方式**
目标是强制发生截断，使注册的邮箱最终恰好以 `dontwannacry.com` 信任区域。
长度验证：
{% code overflow="wrap" %}
```bash
eecho -n "AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@dontwannacry.com" | wc -c
```
{% endcode %}
一旦达到255个字符，最终地址会按如下方式构造：
{% code overflow="wrap" %}
```bash
AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA@dontwannacry.com.exploit-0a8c00a504628ac58246f51601c6009c.exploit-server.net
```
{% endcode %}
运行服务器能够正确接收该邮件，因为它接受所有子域。
该应用在截断后将该地址解释为属于 `dontwannacry.com` 域中的应用程序清单。
该账户被视为内部或可信。/ 一旦连接，即可访问 **管理面板** 而无需额外控制。
---
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