引言
Vulnhub是一个提供各种安全挑战的在线平台，旨在帮助安全爱好者通过实战练习提升自己的安全技能。本文将深入解析Vulnhub靶场中的一个经典案例——SQL注入漏洞，通过实战解析，帮助读者理解SQL注入的原理、类型以及防御方法。
SQL注入漏洞概述
SQL注入（SQL Injection）是一种常见的网络攻击手段，攻击者通过在Web应用中输入恶意SQL代码，从而控制数据库，窃取、篡改或破坏数据。SQL注入漏洞通常存在于缺乏输入验证的动态SQL查询中。
实战解析：Vulnhub靶场中的SQL注入漏洞
1. 靶场环境搭建
首先，我们需要在Vulnhub上找到一个合适的靶场，例如“SQLi-Labs”。下载并导入靶场环境，确保虚拟机运行正常。
2. 信息收集
在开始攻击之前，我们需要对目标网站进行信息收集。可以使用以下工具：
- Nmap：扫描目标网站开放的端口，了解其运行的服务。
- Burp Suite：进行代理，拦截和分析HTTP请求。
通过信息收集，我们发现目标网站存在一个登录页面，用户名为“admin”，密码为“admin”。
3. 检测SQL注入漏洞
在登录页面中，我们尝试使用单引号（’）作为密码输入，发现登录失败。这表明密码字段可能存在SQL注入漏洞。
4. 确定注入类型
为了确定注入类型，我们尝试以下SQL注入语句：
- `admin’ UNION SELECT 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