试图在 java 网络应用程序中实施 SQL 漏洞。 Java + MySQL

Trying to implement an SQL vulnerability in a java web application. Java + MySQL

这有点奇怪。对于我的大学期末项目,我正在尝试开发一个易受攻击的 Web 应用程序作为一种教育工具。我想要实现的漏洞之一是 SQL 漏洞,用户可以通过站点上的 'product search' 页面执行 SQL 注入。

问题是输入似乎在某个地方被自动清理,这意味着我无法执行注入攻击。我只做了一个单引号 (') 的测试记录,这是 returned 当单引号输入搜索时。如果输入没有经过清理,它会 return 一个错误,对吧?我在想这可能是我正在使用的软件的一项功能,我需要禁用或使用旧版本,或者我不小心以这种方式设置了它,以至于发生了这种情况。如果有人知道为什么会发生这种情况,将不胜感激任何帮助! :)

我在 MySQL Community Server 8.0.13 中设置了一个数据库和一个使用 JSP 制作的简单应用程序。我在下面包含了源代码。

'Product Search' 页面:

<%@page import="java.sql.Connection"%>
<%@page import="databaseManagement.DBConnection"%>
<%@page import="java.sql.ResultSet"%>
<%@page import="java.sql.SQLException"%>
<%@page import="java.sql.Connection"%>
<%@page import="java.sql.PreparedStatement"%>

<?xml version="1.0" encoding="ISO-8859-1" ?>
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
<title>Search Our Products</title>
</head>
<body>
    <h1>Search for a product</h1>
    <form method="post" action="ProductSearch">

        Search: <input type="text" name="Search"> <br> 
        <input type="submit" value="Go"> 

        <%@taglib uri="http://java.sun.com/jstl/core_rt" prefix="c"%><br>

                <table align="left" border="1">
                        <tr>
                            <th>ID</th>
                            <th>Name</th>
                            <th>Description</th>
                            <th>Price</th>
                        </tr>
                        <c:forEach var="product" items="${r1}">


                            <tr bgcolor="">

                                <td>${product.id}</td>
                                <td>${product.name}</td>
                                <td>${product.description}</td>
                                <td>${product.price}</td>
                            </tr>
                        </c:forEach>
                    </table>
    </form>
</body>
</html>

java servlet:

import java.io.IOException;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.util.ArrayList;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import databaseManagement.DBConnection;
import databaseManagement.Product;

@WebServlet("/ProductSearch")
public class ProductSearch extends HttpServlet {
    private static final long serialVersionUID = 1L;

    public ProductSearch() {
        super();
        // TODO Auto-generated constructor stub
    }

    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub
    }

    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        // TODO Auto-generated method stub

        String searchTerm = request.getParameter("Search");
        searchTerm = "%" + searchTerm + "%";
        ArrayList<Product> ab = new ArrayList();

        try {

            String sql1 = "select * from products where name like ?;";
            DBConnection db = new DBConnection();
            Connection con = db.getConnection();

            PreparedStatement ps = con.prepareStatement(sql1);

            ps.setString(1, searchTerm);

            ResultSet rs = ps.executeQuery();
            while (rs.next()) {

                Product b = new Product();
                b.setId(rs.getInt("id"));
                b.setName(rs.getString("name"));
                b.setDescription(rs.getString("description"));
                b.setPrice(rs.getString("price"));
                ab.add(b);
            }

            request.setAttribute("r1", ab);
            request.getRequestDispatcher("productSearch.jsp").forward(request, response);

        }

        catch (Exception s2) {
            s2.printStackTrace();
        }

    }
}

PreparedStatement 正在清理您的输入。无需设置参数,只需将它们连接到 sql.

应该放置以接受 SQL 注入的 doPost 方法片段:

....
try {

        String sql1 = "select * from products where name like '"+searchTerm+"';";
        DBConnection db = new DBConnection();
        Connection con = db.getConnection();

        Statement ps = con.createStatement();

        ResultSet rs = ps.executeQuery();
        while (rs.next()) {

....

PreparedStatement 可防止 SQL 注入,因此请改用 Statement。