揭秘SQL注入：安全性测试中的那些常用注入值，教你轻松识别与防范！

引言

SQL注入是一种常见的网络攻击手段，通过在数据库查询语句中插入恶意SQL代码，攻击者可以窃取、篡改或破坏数据。在进行安全性测试时，了解和识别常用的SQL注入值对于防范此类攻击至关重要。本文将详细介绍SQL注入的概念、常用注入值，并提供相应的防范措施。

SQL注入概述

定义

SQL注入（SQL Injection），是指攻击者通过在Web应用程序输入的数据中插入恶意的SQL代码，从而欺骗服务器执行非法的数据库操作。这种攻击通常发生在应用程序没有对用户输入进行严格的验证和过滤时。

类型

根据攻击方式的不同，SQL注入主要分为以下几种类型：

• 联合查询注入（Union-based Injection）：利用联合查询（Union Query）的特性进行攻击。
• 时间盲注（Time-based Blind SQL Injection）：攻击者通过更改数据库响应时间来判断注入的结果。
• 错误注入（Error-based Injection）：通过引发数据库错误信息来获取数据。

常用SQL注入值

1. 常见SQL关键字

• AND, OR
• SELECT, UPDATE, DELETE
• INSERT, DROP
• UNION, GROUP BY
• ORDER BY
• LIKE, IN
• WHERE, HAVING
• LIMIT
• JOIN

2. 特殊字符

• ', "
• ;
• --
• /*, */
• 1 和 0
• NULL, “ (空字符串)

3. 注入语句

• 1' OR '1'='1
• `1’ OR ‘1’=‘1’ UNION SELECT NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 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