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SQL注入（SQL Injection）是一种常见的网络安全威胁，针对使用SQL数据库的应用程序。此教程"SQL Injection Tutorial"由findl4v和luckyr3n提供，旨在帮助读者理解这一攻击手段，学习如何防护以及进行安全编码。 SQL注入攻击发生在攻击者能够通过输入恶意SQL代码来操纵应用程序的SQL查询时。攻击者可以通过不正当的输入，如在登录表单中输入SQL命令，而不是预期的用户名和密码，从而获取敏感数据、修改数据、甚至完全控制数据库服务器。本教程的PDF文件很可能是对以下内容的详尽阐述： 1. **SQL注入基础知识**：解释SQL的基本概念，以及它是如何被用来构建查询和操作数据库的。 2. **攻击类型**：介绍不同类型的SQL注入，如错误基于的注入、盲注、堆叠查询注入等，以及它们的工作原理。 3. **漏洞识别**：讨论可能导致SQL注入的常见编程错误，如不安全的动态SQL、不适当的输入验证、明文SQL查询等。 4. **攻击示例**：提供实际的攻击案例，展示攻击者如何利用这些漏洞，以及攻击可能产生的后果。 5. **防御策略**：介绍预防SQL注入的最佳实践，如使用预编译语句、参数化查询、输入验证、少用动态SQL、限制数据库权限等。 6. **漏洞检测和修复**：讲解如何检测已存在的SQL注入漏洞，以及如何修复这些问题。 7. **安全编码**：强调在开发阶段应遵循的安全编码原则，以减少引入新漏洞的可能性。 8. **工具和技术**：可能会提及一些用于检测SQL注入的自动化工具，以及相关的安全框架和技术。 9. **最佳实践**：提供在设计和实现数据库应用程序时应遵循的安全准则，以确保长期的系统安全。 10. **案例研究**：可能包含真实世界中的SQL注入攻击案例分析，帮助读者更好地理解和应对这类威胁。通过这个教程，读者不仅能够理解SQL注入的原理，还能学会如何在实践中应用这些知识，提高自己开发的安全性。对于任何涉及数据库开发和管理的个人或团队来说，这都是一份非常有价值的参考资料。

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SQL Injection Tutorial

Table of Content

1 What is SQL Injection ............................................................................................................... 2

2 SQL Injection Tutorial .............................................................................................................. 2

2.1 Get Environment Information .......................................................................................... 2

2.1.1 Injectable or Not? ......................................................................................................... 2

2.1.2 Get SQL Injection KeyWord ........................................................................................ 5

2.1.3 Get Database Type ....................................................................................................... 6

2.1.4 Method of Getting Data................................................................................................ 7

2.2 Get Data by SQL Injection ............................................................................................... 8

2.2.1 Get Dabase Name ......................................................................................................... 8

2.2.2 Get Table Name ......................................................................................................... 11

2.2.3 Get Column Name ...................................................................................................... 12

2.2.4 Get Data Record ......................................................................................................... 14

2.3 SQL Injection Tool ......................................................................................................... 15

3 Build Typical Test Environment ............................................................................................. 17

3.1 PHP+MySQL Test Environment .................................................................................... 17

3.2 ASP/ASPX+SQL Server Test Environment .................................................................. 19

4 References ............................................................................................................................... 21

By Janus Security Software (http://www.janusec.com/ )

SQL Injection Tutorial

1 What is SQL Injection

SQL injection is a code injection technique that exploits a security vulnerability occurring

in the database layer of an application.

The vulnerability is present when user input is either incorrectly filtered for string literal

escape characters embedded in SQL statements or user input is not strongly typed and

thereby unexpectedly executed. It is an instance of a more general class of vulnerabilities

that can occur whenever one programming or scripting language is embedded inside

another. SQL Injection is one of the most common application layer attack techniques

used today.

2 SQL Injection Tutorial

If you have no pages with SQL Injection vulnerability for test, please built one of your own

according to chapter 3 – Build Typical Test Environment.

Here let‟s begin our SQL Injection Tutorial.

2.1 Get Environment Information

Example 1: http://192.168.254.21:79/sql.asp?uid=1

Example 2: http://192.168.254.21/mysql.php?username=bob

You can get it in chapter 3 – Build Typical Test Environment.

2.1.1 Injectable or Not?

Example 1:

(1)Normal Request and named Response0 for the result:

http://192.168.254.21:79/sql.asp?uid=1

SQL Injection Tutorial

(2) Add true condition (1=1) and named Response1 for the result:

http://192.168.254.21:79/sql.asp?uid=1 and 1=1

(3) Add false condition (1=2) and named Response2 for the result:

http://192.168.254.21:79/sql.asp?uid=1 and 1=2

Usually, if

Response1=Response0

And Response1! = Response2,

It means there is SQL Injection vulnerability.

Example 2:

SQL Injection Tutorial

Response0:

http://192.168.254.21/mysql.php?username=bob

Response1:

Response1 is not equal to Response0, notice that bob is a string, not an integer, so try:

Response1:

http://192.168.254.21/mysql.php?username=bob' and '1'='1

Now Response1 is equal to Response0, continue:

Response2:

http://192.168.254.21/mysql.php?username=bob' and '1'='2

SQL Injection Tutorial

Response1=Response0

And Response1! = Response2,

It means there is SQL Injection vulnerability.

In some cases, even the parameter is an integer, it need a single quote to match the SQL

sentence.

2.1.2 Get SQL Injection KeyWord

SQL Injection Keyword is a word or phrase that only occurred in Response1 but not

occurred in Response2. SQL Injection Keyword used by SQL Injection Scanners, for

example WebCruiser Web Vulnerability Scanner (http://sec4app.com/ ).

In example 1 and example 2, the keyword may be username, Description etc.

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