> 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/sql-injection/sql-injection-login-bypass.md).

# SQL 注入登录绕过

### 允许绕过登录的 SQL 注入漏洞

* **背景 / 漏洞：** 易受 SQL 注入攻击的连接函数。典型的服务器端查询：/ `SELECT * FROM users WHERE username = 'administrator'--' AND password = ''`
* **实验目标：** 以一名 `administrator` 用户身份登录，而无需知道密码。
* **易受攻击的参数：** `username` 字段（或 `密码` 根据实现）。
* **概念验证（提供的 payload）：**

```sql
' or 1=1-- -
```

* 简要解释：注入一个始终为真的条件（`1=1`)，从而使密码验证失效，导致以返回的第一条记录进行身份验证（通常是 `administrator`).
* **用法示例：** 发送 `username` = `' or 1=1-- -` （并保留/输入任意密码）→ WHERE 子句对所有行都为真，且会话将以某个用户身份打开（通常是管理员）。
* **预期结果：** 无需有效密码即可成功以管理员身份登录。
* **影响：** 特权账户完全失陷、访问权限提升、敏感数据泄露/篡改以及应用控制权被获取。


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