揭秘DVWA SQL注入漏洞，AWVS检测实战攻略

1. 引言

SQL注入是一种常见的网络安全漏洞，攻击者可以通过在数据库查询中注入恶意SQL代码，从而获取非法的数据访问权限。本文将深入探讨DVWA（Damn Vulnerable Web Application）中SQL注入漏洞，并结合AWVS（Acunetix Web Vulnerability Scanner）的检测实战，为读者提供一套完整的防御与检测攻略。

2. DVWA SQL注入漏洞分析

2.1 DVWA简介

DVWA是一款专为安全研究和测试设计的PHP/MySQL应用程序。它内置了多种漏洞，包括SQL注入、XSS、文件包含等，方便安全测试人员模拟真实环境下的漏洞攻击。

2.2 SQL注入漏洞原理

SQL注入漏洞是指攻击者在输入框中输入恶意的SQL代码，从而绕过应用程序的安全限制，直接操作数据库。

2.3 DVWA SQL注入漏洞实例

以下是一个简单的DVWA SQL注入漏洞示例：

<?php
if (isset($_GET['id'])) {
    $id = intval($_GET['id']);
    $query = "SELECT * FROM users WHERE id=$id";
    // ...
}
?>

在上面的代码中，程序没有对用户输入的id进行任何验证，攻击者可以构造如下的恶意输入：

”` http://example.com/dvwa/vulnerabilities/sqli/?id=1’ UNION SELECT null, null, null, null, null, null, null, null, null, (SELECT * FROM users), 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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