SQL注入是一种常见的网络安全威胁，它允许攻击者通过在数据库查询中注入恶意SQL代码，从而窃取、篡改或破坏数据。以下是五大你可能不知道的SQL注入信息泄露风险：
1. 数据库敏感信息泄露
当攻击者成功实施SQL注入攻击时，他们可以访问数据库中的敏感信息，如用户名、密码、信用卡号等。这些信息一旦泄露，可能会导致严重的后果，包括身份盗窃、欺诈和财务损失。
示例：
SELECT * FROM users WHERE username = 'admin' AND password = ' OR '1'='1'
在这个例子中，攻击者试图绕过密码验证，直接访问管理员账户。
2. 数据库权限提升
通过SQL注入，攻击者不仅能够访问数据库中的数据，还可能提升自己的权限，获得对数据库的完全控制权。这意味着他们可以执行任何数据库操作，包括删除、修改或创建数据库对象。
示例：
GRANT ALL PRIVILEGES ON *.* TO 'attacker'@'%' WITH GRANT OPTION;
这个SQL命令将所有权限授予名为attacker的用户，从而允许攻击者完全控制数据库。
3. 应用程序逻辑破坏
SQL注入攻击不仅限于数据库层面，还可能破坏应用程序的逻辑。攻击者可以通过注入恶意代码，导致应用程序崩溃或执行未授权的操作。
示例：
SELECT * FROM orders WHERE order_id = 123; DROP TABLE orders;
在这个例子中，攻击者试图在查询订单信息的同时删除orders表。
4. 数据库完整性受损
SQL注入攻击可能导致数据库数据的完整性受损。攻击者可以插入或修改数据，导致数据不一致或错误。
示例：
UPDATE users SET password = 'new_password' WHERE username = 'admin'
这个SQL命令试图将管理员账户的密码更改为new_password，但如果攻击者篡改了查询条件，可能会导致意外的数据修改。
5. 应用程序可用性下降
SQL注入攻击可能占用数据库资源，导致应用程序响应时间变慢或完全不可用。这可能会影响用户体验，并可能导致业务损失。
示例：
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